JP4959376B2 - Double shell structure tank device with displacement measuring device and tank equipment - Google Patents

Description

  The present invention relates to a double-shell structure tank apparatus and a tank facility including a tank displacement measuring device in a large-capacity double-shell structure tank that stores, for example, liquefied natural gas (LNG).

Various structures have been proposed and manufactured as tanks for storing LPG (Liquid Petroleum Gas), LNG (Liquid Natural Gas) and the like.
For example, in the case of a large earthquake occurring around the low-temperature liquefied gas tank having a double shell structure composed of an outer tank and an inner tank, the one described in Patent Document 1 should be Even if the gas tank breaks and leakage of low-temperature liquefied gas occurs, a breakwater is provided to prevent secondary disasters such as contamination of the surrounding environment.
In addition, what is described in Patent Document 2 receives an inner tank made of a metal plate capable of storing a low-temperature liquefied gas in an outer tank made of concrete, and a low-temperature liquefied gas leaked from the inner tank. And a metal plate receiving tank.
In such a double-shell tank device, if a large earthquake occurs and the inner tank is displaced or rotated relative to the outer tank, there is a possibility that normal operation cannot be performed. It is desirable to monitor the relative displacement or rotation of the tank.
However, both of Patent Document 1 and Patent Document 2 are provided with a concrete outer tub or a breakwater so that the low-temperature liquefied gas does not leak when a large earthquake occurs. However, there is no means for detecting behavior such as displacement (slide) and rotation of the inner tank due to a large earthquake or the like.

Further, although not a tank for storing LPG, LNG, etc., as shown in FIG. 25, a storage tank for monitoring the damage state of a storage tank such as an oil tank due to an earthquake or the like and predicting it before serious damage occurs. An optical fiber 103 is laid over the entire circumference of the side plate 102 joined to the bottom end plate 101 in the vicinity of the joined portion and the entire circumference at an appropriate height from the bottom end plate 101. A strain measuring device and a strain data processing device for measuring the circumferential strain of the side plate 102 over the entire circumference, and the bottom of the side plate 102 in the joint portion from the circumferential strain measurement value of the side plate 102 in the vicinity of the joint portion. Estimate the inclination angle with respect to the end plate 101, and the local plasticity generated in the joint portion together with the measured value of the strain in the circumferential direction of the side plate 102 at the appropriate height from the bottom end plate 101 and the plastic strain value generated by buckling. Value, occurrence of cracks, the bottom end plate 1 from sinking lower foundation, which was to monitor the buckling of the side plate 102 has been proposed (e.g., Patent Document 3).
Although the thing of patent document 3 also monitors the damage state of storage tanks, such as an oil tank by an earthquake etc., the means to detect whether the storage tank was displaced or rotated irrespective of whether it was damaged or not damaged Is not provided at all.

JP-A-11-63393 JP 2003-240197 A JP 2002-340741 A

  In such a low temperature liquefied gas tank with a double shell structure, if a large earthquake occurs and the inner tank is displaced or rotated relative to the outer tank, there is a possibility that normal operation cannot be performed. It is desirable to monitor the relative displacement or rotation of the inner tub with respect to.

In addition, when the outer and inner tanks of a low-temperature liquefied gas tank with a double shell structure are made of, for example, a cryogenic metal, and a concrete breakwater is provided on the outside, the relative displacement or rotation is monitored. It is conceivable to install the device so as to penetrate the side surface of the outer tub.
However, when a low-temperature liquefied gas tank with a double shell structure is composed of an inner tank made of a cryogenic metal and an outer tank made of concrete, holes should be provided in the side and bottom of the concrete outer tank for safety. I can't.
Furthermore, since it is impossible for a person to enter the tank unless the inside of the tank is opened, if a monitoring device is installed in the tank, it becomes difficult to maintain these.
Therefore, an apparatus for monitoring the three-dimensional displacement in the radial direction, the rotational direction, and the height direction of the inner tank is required from the upper part of the outer tank.

  The present invention intends to solve the problems of the above-described configuration, and is composed of a low-temperature liquefied gas tank having a double shell structure, particularly an inner tank made of a cryogenic metal and an outer tank made of concrete. A double-shell structure tank apparatus and a tank facility provided with a displacement measuring device capable of monitoring the relative displacement or rotation of the inner tank relative to the outer tank in a low-temperature liquefied gas tank having a double-shell structure It is intended.

  In order to solve the above problems, the present invention aims to solve the problems by the following means.

(1) The double shell structure tank device of the first means is
In a double-shell structure tank having an outer tank and an inner tank,
A pipe for measuring radial displacement passing through the upper part of the outer tub,
A shutoff valve provided outside the outer tank of the radial displacement measuring pipe;
A detachable seat for a laser transmitter / receiver provided at the upper end of the radial displacement measuring pipe;
It is provided with.

(2) The second means is the double shell structure tank device of the first means,
A mirror body that is attached to the lower end of the radial displacement measuring pipe and reflects laser light emitted from a laser-type distance measuring device connected to the laser transmitter / receiver seat, in the direction of the inner tank,
It is provided with.

(3) The third means is the double shell structure tank device of the second means,
The inner tank has an inner tank bottom plate and an inner tank side wall, and an inner tank upper lid provided to be movable relative to the inner tank side wall,
The radial displacement measuring pipe extends in a vertical direction and penetrates the inner tank upper lid.

(4) The fourth means is the double shell structure tank device of the third means,
The radial displacement measuring pipe and the mirror body are made of the same material.

(5) The fifth means is the double-shell structure tank device of the third or fourth means,
Two pipes for measuring the radial displacement facing the inner tank are provided,
The specular body is installed so that the irradiation direction of the laser light reflected by the specular body opens within a range of 90 ° ± 20% in a horizontal plane.

(6) The sixth means is the double shell structure tank device of the third or fourth means,
At least three radial displacement measuring pipes facing the inner tank are provided,
The mirror body is installed such that the irradiation direction of the laser beam reflected by the mirror body opens at an equal angle in a horizontal plane.

(7) The seventh means is the double-shell structure tank device of the third or fourth means,
The radial displacement measuring pipe facing the inner tank is one,
The specular body has a polygonal pyramid shape,
The laser beam is irradiated to a plurality of locations.

(8) The eighth means is the double-shell structure tank device of the third or fourth means,
The radial displacement measuring pipe facing the inner tank is one,
The specular body has a polygonal pyramid shape,
The irradiation direction of the laser beam can be changed.

(9) The ninth means is the double-shell structure tank device according to any one of the third to eighth means,
A vertical member attached to the inner tank side wall;
A rotational displacement measuring pipe extending in the vertical direction and penetrating the upper part of the outer tank and the upper cover of the inner tank and facing the vertical member;
A shutoff valve provided outside the outer tub of the rotational direction displacement measuring pipe;
A detachable seat for a laser transmitter / receiver provided at an upper end of the rotational direction displacement measuring pipe;
A second mirror body that is attached to a lower end of the rotational direction displacement measuring pipe and reflects laser light emitted from a laser-type distance measuring device connected to the laser transmitter / receiver seat to the vertical member;
It is provided with.

(10) The tenth means is the double-shell structure tank device of the ninth means,
The rotational direction displacement measuring pipe and the second mirror body are made of the same material.

(11) The eleventh means is a double-shell structure tank device according to any one of the third to tenth means,
A horizontal member attached to the inner tank side wall;
A pipe for measuring the displacement in the height direction of the inner tub extending vertically and penetrating the upper portion of the outer tub and the upper lid of the inner tub and facing the horizontal member;
A shutoff valve provided outside the outer tank of the pipe for measuring displacement in the height direction of the inner tank;
A laser transmitter / receiver mounting / dismounting seat provided at the upper end of the height direction displacement measuring pipe of the inner tank,
It is provided with.

(12) The twelfth means is the double-shell structure tank device according to any one of the third to eleventh means,
It is provided with.
A pipe contraction correcting pipe extending in the vertical direction and penetrating through the upper part of the outer tank and the upper cover of the inner tank,
A shutoff valve provided outside the outer tub of the pipe contraction correction pipe;
A detachable seat for a laser transmitter / receiver provided at an upper end of the pipe contraction correction pipe;
A horizontal pipe lower end horizontal member attached to the lower end of the pipe contraction correction pipe;
It is provided with.

(13) The thirteenth means is the double shell structure tank device according to any one of the third to eighth means,
A temperature sensor is provided at a predetermined interval on the radial displacement measuring pipe or the pipe penetrating the inner tank upper lid.

(14) The fourteenth means is the double-shell structure tank device of the ninth or tenth means,
A temperature sensor is provided at a predetermined interval in the rotational direction displacement measuring pipe.

(15) The fifteenth means is the double shell structure tank device of the eleventh means,
A temperature sensor is provided at predetermined intervals on the pipe for measuring displacement in the height direction of the inner tank.

(16) The sixteenth means is the double shell structure tank device according to the second,
The radial displacement measuring pipe extends in a vertical direction and extends between the inner tank and the outer tank.

(17) The seventeenth means is the double shell structure tank device according to the sixteenth aspect,
At least three radial displacement measuring pipes facing the inner tank are provided,
The mirror body is installed such that the irradiation direction of the laser beam reflected by the mirror body opens at an equal angle in a horizontal plane.

(18) The eighteenth means is the double shell structure tank device according to the sixteenth or seventeenth aspect,
A vertical member attached to the inner tank side wall;
A rotational displacement measuring pipe extending in the vertical direction and extending between the inner tank and the outer tank;
A shutoff valve provided outside the outer tub of the rotational direction displacement measuring pipe;
A detachable seat for a laser transmitter / receiver provided at an upper end of the rotational direction displacement measuring pipe;
A second mirror body that is attached to a lower end of the rotational direction displacement measuring pipe and reflects laser light emitted from a laser-type distance measuring device connected to the laser transmitter / receiver seat to the vertical member;
It is provided with.

(19) The nineteenth means is the double-shell structure tank device according to any one of the sixteenth to eighteenth aspects,
A horizontal member attached to the inner tank side wall;
A pipe for measuring the displacement in the height direction of the inner tub extending in the vertical direction and facing the horizontal member;
A shutoff valve provided outside the outer tank of the pipe for measuring displacement in the height direction of the inner tank;
A laser transmitter / receiver mounting / dismounting seat provided at the upper end of the height direction displacement measuring pipe of the inner tank,
It is provided with.

(20) The twentieth means is the double-shell structure tank device according to any one of the first to 19,
A laser-type distance measuring device is connected to each of the laser transmitter / receiver seats.

(21) The twenty-first means is the double-shell structure tank device according to any one of the ninth to thirteenth, eighteenth and nineteenth aspects,
A tank monitoring device that calculates and displays radial displacement and rotational displacement in the double-shell structure tank device;
The tank monitoring device
The measured value of the radial displacement measured by the laser distance measuring instrument connected to the radial displacement measuring pipe and the measured value of the laser distance measuring instrument connected to the rotational displacement measuring pipe. The radial distance and the rotational distance are calculated by subtracting the measured pipe length measured by the laser distance measuring instrument connected to the pipe contraction correction pipe from the measured rotational displacement. A pipe length corrector;
An inner tank side wall position calculator for calculating the position of the inner tank side wall from the radial distance from the pipe length corrector;
A center position calculator for calculating the center position of the inner tank side wall based on the position of the inner tank side wall from the inner tank side wall position calculator;
A radial displacement calculator that calculates a displacement amount of the center position of the inner tank side wall based on the center position from the center position calculator;
A vertical member position calculator for calculating the position of the vertical member based on the rotational direction distance from the pipe length corrector;
A center position corrector that calculates the true position of the vertical member based on the position of the vertical member from the vertical member position calculator;
A rotation direction displacement calculator for calculating a rotation angle of the inner tank side wall based on the position of the true vertical member from the center position corrector;
A display for displaying the amount of displacement of the center position from the radial displacement calculator and the rotation angle from the rotational displacement calculator;
It is provided with.

(22) The double-shell structure tank device of the twenty-second means is
In a double-shell structure tank having an outer tank and an inner tank,
Four radial displacement measuring pipes that penetrate the upper part of the outer tub and are attached at equal intervals;
A shut-off valve provided outside the outer tub of each radial displacement measuring pipe;
A laser transceiver mounting / removing seat provided at the upper end of each radial displacement measuring pipe,
A mirror body that is attached to the lower end of each radial displacement measuring pipe and reflects each laser beam emitted from each laser type distance measuring device connected to each laser transmitter / receiver seat to the inner tank. When,
Two vertical members attached to the inner tank side wall with respect to the center of the inner tank,
A rotational displacement measuring pipe that extends in the vertical direction and penetrates the upper part of the outer tank and the upper cover of the inner tank and faces each of the vertical members;
A shut-off valve provided outside the outer tub of each rotational direction displacement measuring pipe;
Removable seat for laser transmitter / receiver provided at the upper end of each rotational direction displacement measuring pipe,
Reflecting each laser beam emitted from each laser type distance measuring device attached to the lower end of each rotational direction displacement measuring pipe and connected to each laser transmitter / receiver seat in the direction of each vertical member. Two mirror bodies,
A pipe contraction correction pipe extending vertically and penetrating through the upper part of the outer tub, a shutoff valve provided outside the outer tub of the pipe contraction correction pipe, and provided at an upper end of the pipe contraction correction pipe A horizontal member at the lower end of the horizontal pipe attached to the detachable seat for the laser transceiver and the lower end of the pipe contraction correction pipe;
A tank monitoring device that calculates and displays radial displacement and rotational displacement in the double-shell structure tank device;
The tank monitoring device
A center position calculator for calculating the center position of the inner tank side wall from the measured value of the radial displacement measured by the laser type distance measuring instrument connected to the radial displacement measuring pipe;
Measured by the laser distance measuring instrument connected to the pipe contraction correction pipe from the measured value of the rotational displacement measured by the laser distance measuring instrument connected to the rotational displacement measuring pipe. A pipe length corrector that subtracts the measured pipe length and calculates the rotational distance.
A rotation direction calculator for calculating a rotation angle of the inner tank side wall based on the rotation direction distance from the pipe length corrector and the center position calculated by the center position calculator;
A display device for displaying these measured values and calculated values is provided.

(23) The double-shell structure tank device of the 23rd means is
In a double-shell structure tank having an outer tank and an inner tank,
Four radial displacement measuring pipes that penetrate the upper part of the outer tub and are attached at equal intervals;
A shut-off valve provided outside the outer tub of each radial displacement measuring pipe;
A laser transceiver mounting / removing seat provided at the upper end of each radial displacement measuring pipe,
A mirror body that is attached to the lower end of each radial displacement measuring pipe and reflects each laser beam emitted from each laser type distance measuring device connected to each laser transmitter / receiver seat to the inner tank. When,
Two vertical members attached to the inner tank side wall with respect to the center of the inner tank,
A rotational displacement measuring pipe that extends in the vertical direction and penetrates the upper part of the outer tank and the upper cover of the inner tank and faces each of the vertical members;
A shut-off valve provided outside the outer tub of each rotational direction displacement measuring pipe;
Removable seat for laser transmitter / receiver provided at the upper end of each rotational direction displacement measuring pipe,
Reflecting each laser beam emitted from each laser type distance measuring device attached to the lower end of each rotational direction displacement measuring pipe and connected to each laser transmitter / receiver seat in the direction of each vertical member. Two mirror bodies,
A temperature sensor attached to any of the measurement pipes;
A tank monitoring device that calculates and displays radial displacement and rotational displacement in the double-shell structure tank device;
The tank monitoring device
A center position calculator for calculating the center position of the inner tank side wall from the measured value of the radial displacement measured by the laser type distance measuring instrument connected to the radial displacement measuring pipe;
From the measured value of the rotational displacement measured by the laser-type distance measuring instrument connected to the rotational displacement measuring pipe, the measured value of the pipe length calculated based on the temperature measured by the temperature sensor is obtained. A pipe length corrector that subtracts and calculates the rotational distance;
A rotation direction calculator for calculating a rotation angle of the inner tank side wall based on the rotation direction distance from the pipe length corrector and the center position calculated by the center position calculator;
A display device for displaying these measured values and calculated values is provided.

(24) The tank facility of the twenty-fourth means is the double-shell structure tank device according to any one of the twenty-first to twenty-third aspects,
A plurality of the double shell structure tanks are installed,
Each of the tank monitoring devices is provided in a central monitoring center.

The invention according to each claim described in the claims adopts each of the above-mentioned means, and in a double-shell structure tank having an outer tank and an inner tank, a radial direction penetrating the upper part of the outer tank By providing a displacement valve, a shut-off valve provided outside the outer tank for the radial displacement measurement, and a laser transceiver mounting / dismounting seat provided at the upper end for the radial displacement measurement, When a large-scale earthquake occurs, the amount of displacement (slide) of the inner tank relative to the outer tank can be measured, and the position after displacement of the inner tank can be specified.
It can also be detected whether or not the inner tank side wall has buckled.
Furthermore, the position after the rotational displacement of the inner tank can be specified by a displacement measuring device that measures the rotational displacement of the inner tank.

  Hereinafter, a double-shell structure tank device, a tank displacement measurement device, and tank equipment provided with a displacement measurement device according to each embodiment of the present invention will be described.

(First embodiment of the present invention)
First, with reference to FIGS. 1 to 7 and FIG. 24, a double-shell structure tank apparatus and a tank facility provided with a displacement measuring apparatus according to a first embodiment of the present invention will be described.
FIG. 1 is an overall plan view of a double-shell structure tank according to a first embodiment of the present invention.
FIG. 2 is a horizontal sectional view of the double-shell structure tank according to the first embodiment of the present invention.
FIG. 2 is also a BB end view in FIG. 3 below.
FIG. 3 is an end view taken along arrow AA of FIG.
FIG. 4 is a detailed side end view of the radial displacement measuring device 26 of FIG.
FIG. 5 is a detailed side end view of the rotational direction displacement measuring device 27 of FIG.
6 is a detailed side end view of the inner tank height direction displacement measuring device 28 of FIG.
FIG. 7 is a detailed side end view of the pipe contraction correction amount measuring device 29 of FIG.
FIG. 24 is an overall schematic diagram of a tank facility in which a plurality of double-shell structured tanks according to each embodiment of the present invention are installed.

The tank displacement measuring device according to the first embodiment of the present invention includes four (at least two) radial displacement measuring devices 26, two (at least one) rotational displacement measuring devices 27, and one. The inner tank height direction displacement measuring device 28, one pipe shrinkage correction amount measuring device 29, and a tank monitoring device 70 (70a).
Further, on the inner surface of the inner tank side wall 3, a horizontal member 20 for measuring the displacement in the height direction of the inner tank and two (at least one) vertical member 21 for measuring the tank rotation are attached.
Details of the tank monitoring device 70 (70a) will be described later.

(Overall structure of double shell tank)
As shown in FIGS. 1, 2, and 3, the double-shell structure tank includes an outer tank 5 made of reinforced concrete and an inner tank 1 made of ultra-low temperature resistant metal installed in the outer tank 5. Yes.
In general, when the inner tub 1 and the outer tub 5 are made of metal, it is necessary to further provide a concrete enclosure wall or the like on the outside of the outer tub in case the metal is damaged.
However, in the double-shell structure tank according to the present embodiment, since the outer tub 5 is made of reinforced concrete, no further concrete enclosure or the like is required.

As shown in FIG. 3, the outer tub 5 includes a disk-shaped outer tub bottom plate 6, a cylindrical outer tub side wall 7 that is airtightly fixed on the outer tub bottom plate 6, and an airtight seal at the upper end of the outer tub side wall 7. And a dome-shaped outer tub upper lid 8 fixed to the dome.
In this case, a hole or the like cannot be formed in the outer tank bottom plate 6 and the outer tank side wall 7 made of reinforced concrete.
When holes are made in the outer tank bottom plate 6 and the outer tank side wall 7 made of reinforced concrete, there is a high risk that the stored liquid leaks out from the inner tank.
Therefore, the cryogenic fluid carry-in / out pipe 15 and the pipes for each measuring device, which will be described later, all penetrate the outer tank upper lid 8 and reach the inner tank 1 or the inner tank 1 and the outer tank 5. Is provided.
Further, an airtight metal plate 48 is attached or attached to the inner surface of the outer tank bottom plate 6, the outer tank side wall 7, and the outer tank upper lid 8 of the outer tank 5 as illustrated in FIG. .

On the airtight metal plate 48 (see FIG. 4) of the outer tank bottom plate 6 in the outer tank 5, as shown in FIG.
The inner tank 1 is placed on the tank support member / heat insulating material 10.
The inner tank 1 is, for example, a tank made of an ultra-low temperature resistant metal such as a 9% Ni steel plate that can store a cryogenic liquid having a diameter of 80 m and a height of 40 m.
In addition, the diameter of the internal diameter of the outer tank 5 is about 82-84m.
Therefore, a gap of about 1 to 2 m is provided between the outer surface of the inner tub 1 and the inner surface of the outer tub 5 in order to lay a cold insulating material.

The inner tank 1 includes a disc-shaped inner tank bottom plate 2, a cylindrical inner tank side wall 3 fixed on the inner tank bottom plate 2 by welding or the like, and a disk-shaped inner tank that closes the upper surface of the inner tank side wall 3. The upper lid 4 is constituted.
The diameter of the inner tank upper lid 4 is formed larger than the diameter of the inner tank side wall 3, and the inner tank upper lid 4 is provided with a short cylindrical ridge extending downward on the outer periphery thereof.
The inner tank upper lid 4 is suspended and supported from the outer tank upper lid 8 by a number of inner tank upper lid suspension fittings 9.
Note that the upper ends of a number of inner tank upper lid suspension fittings 9 are connected to an airtight metal plate 48 on the inner surface of the outer tank 5.
In this way, the inner tank upper lid 4 is fixed to the metal plate 48 on the inner surface of the outer tank 5 by the inner tank upper lid suspension fitting 9 so that the inner tank upper lid 4 and the inner tank side wall 3 are not mechanically contacted. The tank upper lid 4 is not affected by the displacement of the inner tank side wall 3.

A heat insulating material 11 such as glass wool is attached or pasted on the entire outer periphery of the inner tank side wall 3.
Furthermore, in the space between the heat insulating material 11 such as glass wool and the outer tank side wall 7 and the space on the upper surface of the inner tank upper lid 4, in order to prevent transmission of cold heat and leakage due to gas convection, for example, particulates such as pearlite. The heat insulating material 12 is filled and stored.
In addition, in the short cylindrical bowl on the outer periphery of the inner tank upper lid 4, the particulate heat insulating material 12 such as pearlite does not enter the inner tank 1 through the gap between the inner tank upper lid 4 and the upper end of the inner tank side wall 3. It is set to such a height.

In order to inject the nitrogen gas 14 cooled to a very low temperature, a nitrogen gas supply pipe 24 is connected to the outer tank upper lid 8.
The nitrogen gas supply pipe 24 passes between the outer surface of the inner tank side wall 3 and the inner surface of the outer tank 5, and is open below the inner tank bottom plate 2.
In maintenance and the like, nitrogen gas is purged from the nitrogen gas supply pipe 24, and methane gas, air, and the like between the inner tank 1 and the outer tank 5 are purged.

A cryogenic fluid loading / unloading pipe 15 is provided so as to penetrate the outer tank upper lid 8, the airtight metal plate 48 and the inner tank upper lid 4.
A discharge pump 16 and a bell mouth 17 are attached to the lower end of the cryogenic fluid carry-in / out pipe 15.
The lower end of the cryogenic fluid carry-in / out pipe 15 is connected to the inner tank bottom plate 2 by a support 18 in order to suppress shaking, vibration and the like.
A barrel (not shown) having a diameter larger than that of the cryogenic fluid carry-in / out pipe 15 is fixed on the inner tank upper lid 4 by welding or the like.
The cryogenic fluid carry-in / out piping 15 extends into the inner tank 1 through this barrel.
The height of the barrel is set such that the particulate heat insulating material 12 such as pearlite does not enter the inner tank 1 through the gap between the barrel and the cryogenic fluid carry-in / out pipe 15.

In the cryogenic fluid carry-in / out pipe 15, a seal member (not shown) is provided in a through portion of the outer tank upper lid 8.
In addition, unillustrated piping for various types of measurement is also provided.

Further, as shown in FIGS. 1 and 2, four radial displacement measuring devices 26, two rotational displacement measuring devices 27, one inner tank height measuring device 28, and one The pipe shrinkage correction amount measuring device 29 is also attached so as to penetrate the outer tank upper lid 8 (the upper part of the outer tank 5) and the inner tank upper cover 4 (the upper part of the inner tank 1).
A vaporized gas recovery pipe 25 is attached near the top of the outer tank upper lid 8 as shown in FIG.
Then, the natural gas (methane gas or the like) that is vaporized and stays near the top of the outer tank upper lid 8 is recovered by the vaporized gas recovery pipe 25, liquefied again by a known reliquefaction device, and returned to the inner tank 1. It has become.

1 and FIG. 2, a plurality of (for example, six) double shell structure tanks are installed in the tank facility 91 as shown in FIG.
In addition, it is not necessary to provide a liquid-proof bank like what was described in patent document 1 in the outer periphery of the tank equipment 91, For example, fences, such as a wire net, and other normal entrance prevention enclosures are provided.
A remote control monitoring center (building) in which a central computer having a tank monitoring device 70 (70a) is installed is installed outside the tank facility 91.
The remote control monitoring center includes not only the tank monitoring device 70 (70a) but also the discharge pump control device 90, various circuits for monitoring the temperature of the tank and the level of LNG (the circuits are subprograms, sequence blocks, A computer, a storage device 78, a display device 79, and the like are also provided, and information and operation devices necessary for tank monitoring and operation are collected.

(Configuration of radial displacement measuring device)
Next, a detailed configuration of the radial displacement measuring device 26 will be described with reference to FIGS.
As shown in FIG. 1 and FIG. 2, four radial displacement measuring units constituted by radial displacement measuring pipes 30a, 30b, 30c, 30d, laser type distance measuring instruments 38a, 38b, 38c, 38d, etc. The device 26 is attached at an equal angle in the same horizontal plane near the periphery of the outer tank upper lid 8 and the inner tank side wall 3.
This equal angle is 90 ° (allowable range: ± 20%) when the number of radial displacement measuring devices 26 is four, 120 ° (allowable range: ± 20%) when three, and five when the number is five. It shall mean a predetermined angle of 72 ° (allowable range: ± 20%).

Assuming that the inner tank 1 is not distorted (does not deform into an ellipse, etc.), two laser types in which the irradiation angle of the laser beam is 90 ° (allowable range: ± 20%) in a horizontal plane with each other. It is possible to use only the distance measuring devices 38a and 38b.
At this time, if the inner diameter Dt (radius) of the inner tank side wall 3 is 40 m, each radial displacement measuring device 26 is located at a position where the distance Dp from the center of the outer tank upper lid 8 is 38 to 39 m. It is preferable to attach as close as possible to the inner surface.

That is, the distance Dp from the center is such that the radial displacement measuring device 26 and the inner surface of the inner tank 1 are in contact with each other even if the inner tank 1 contracts during the cool-down and the inner tank 1 is deformed in the radial direction or the rotational direction. Designed not to do.
Moreover, it is possible to measure even weak reflected light irregularly reflected on the inner surface of the inner tank side wall 3.
That is, the tangential direction of the inner surface of the inner tank side wall 3 at the irradiation point of the laser beams 39a, 39b, 39c, and 39d described later to the inner surface of the inner tank side wall 3 is not necessarily the optical axis of the laser beams 39a, 39b, 39c, and 39d. This is because it is not always right-angled.
Therefore, the inner surface of the inner tank side wall 3 is preferably not a mirror surface.
Further, the difference between the inner diameter Dt of the inner tank side wall 3 and the distance Dp from the center of the outer tank upper lid 8 is such that the mirror body housing enclosure 36 does not hit the inner tank side wall 3 even if the inner tank 1 is displaced. For example, it is 1 to 2 m.

As shown in FIGS. 3 and 4, each radial displacement measuring device 26 includes a displacement measuring instrument storage box 34, laser distance measuring instruments 38a, 38b, 38c, 38d, radial displacement measuring pipes 30a, 30b, 30c, 30d, pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shutoff valve 35, mirror body housing enclosure 36, first mirror body 37 for displacement measurement , The outlet tube 40, the purge discharge pipe 22, the purge nitrogen gas supply pipe 23, and the like.
The exit tube 40 is not necessarily required, and may be one in which holes through which the laser beams 39a, 39b, 39c, and 39d pass are formed on the surface of the mirror body housing enclosure 36 that faces the inner tank side wall 3.

Next, a detailed configuration of the radial displacement measuring device 26 will be described with reference to FIGS.
Radial displacement measuring pipes 30 a, 30 b, 30 c, 30 d are provided vertically through the outer tank upper lid 8, the airtight metal plate 48 and the inner tank upper lid 4.
Radial displacement measuring pipes 30a, 30b, 30c, 30d are not shown in the portion where the outer tank upper lid 8 and the airtight metal plate 48 penetrate, so that natural gas does not leak to the outside in order to maintain airtightness. A sealing material is provided.
The radial displacement measuring pipes 30a, 30b, 30c, and 30d are supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8.

Laser-type distance measuring instruments 38a, 38b, 38c, 38d are connected to the upper ends of the radial displacement measuring pipes 30a, 30b, 30c, 30d above the outer tank upper lid 8 (outside the outer tank 5), respectively. A pipe-side flange 41 is formed.
In addition, a shutoff valve 35 is interposed in each of the radial displacement measuring pipes 30a, 30b, 30c, and 30d between the outer tank upper lid 8 and the pipe-side flange 41.
A purge discharge pipe 22 having a shut-off valve interposed therein is connected to the radial displacement measuring pipes 30a, 30b, 30c, and 30d between the shut-off valve 35 and the pipe-side flange 41.

A displacement measuring device storage box 34 can be detachably connected to the upper part of each pipe side flange 41 by a displacement measuring device storage box side flange 45 and a mounting bolt nut 44.
In the displacement measuring instrument storage box 34 are stored laser distance measuring instruments 38a, 38b, 38c, and 38d for radial displacement measurement of an intrinsically safe explosion-proof type, a pressure-proof explosion-proof type, or an internal pressure explosion-proof type.
The displacement measuring instrument storage box 34 and the displacement measuring laser type distance measuring instruments 38a, 38b, 38c, 38d stored in the displacement measuring instrument storage box 34 are intrinsically safe explosion-proof type, pressure-proof type or internal pressure-proof type. It has a configuration with performance.
Then, the measured values La, Lb, Lc, Ld of the existing radial displacement measured by the laser type distance measuring devices 38a, 38b, 38c, 38d for measuring the radial displacement (or the measured value Lma of the new radial displacement). , Lmb, Lmc, Lmd) are transmitted to the tank monitoring device 70 (70a) as will be described later.

A purge nitrogen gas supply pipe 23 with a shut-off valve interposed is connected above the displacement measuring instrument storage box 34 to discharge oxygen, carbon dioxide and the like.
When measuring, the displacement measuring instrument storage box 34 storing the laser type distance measuring instruments 38a, 38b, 38c, 38d is connected to the pipe side flange 41 by the mounting bolt nut 44, and the purge nitrogen gas supply pipe 23 is connected. From the purge discharge pipe 22, oxygen, carbon dioxide, etc. are discharged from the purge discharge pipe 22, and then the shut-off valve 35 is opened.

The laser type distance measuring devices 38a, 38b, 38c, and 38d may be permanently installed in each displacement measuring device storage box 34.
Alternatively, the laser type distance measuring devices 38a, 38b, 38c, and 38d may be stored in a remote control monitoring center or the like and stored in each displacement measuring device storage box 34 only at the time of measurement.
When storing in each displacement measuring instrument storage box 34 only at the time of measurement, the laser type distance measuring instruments 38a, 38b, 38c, and 38d are shared by appropriately attaching and detaching one measuring instrument, and thereby necessary measuring instruments. Can be reduced.

A large hole (diameter D2) is formed in each inner tank upper lid 4 through which each of the radial displacement measuring pipes 30a, 30b, 30c, 30d passes, and above each large hole, each radial displacement measurement is performed. A barrel 46 having a predetermined height for guiding the pipes 30a, 30b, 30c, and 30d is attached by welding or the like.
The height of the barrel 46 is set such that the particulate heat insulating material 12 filled on the inner tank upper lid 4 does not enter the inner tank 1.
Further, the bores of the inner cover 4 and the inner diameter D2 of the barrel 46 are arranged so that the radial displacement measuring pipes 30a and 30b extend through the inner tank upper cover 4 and to the inside of the inner tank 1 even when the inner layer upper cover 4 contracts during cool down. , 30c, and 30d are designed in consideration of gaps.
For example, when the diameter D1 of the outer diameter of the radial displacement measuring pipes 30a, 30b, 30c, and 30d is 100 mmφ, and the amount of contraction of the inner tank upper lid 4 at the time of cool-down is 60 mm, the inner diameter D2 of the barrel 46 is about 800 mmφ. It becomes.
The diameter D2 of the inner diameter of the barrel 46 is set so that each radial displacement measuring pipe 30a, 30b, 30c, 30d is positioned on the radial center side of the inner tank upper lid 4 in the barrel 46 before the cool-down. It is preferable to make the diameter as small as possible so that it may be located outside the inner tank upper lid 4 in the radial direction in the barrel 46 later.

A ring-shaped movable lid 47 is placed on the upper surface of the barrel 46 so as to be movable in the front-rear, left-right, up-down directions.
Pipes 30a, 30b, 30c, and 30d for radial displacement measurement are passed through the center hole of the movable lid 47, and the movable lid 47 is not fixed to the measurement pipe or the barrel 46, and has a degree of freedom. have.
The diameter of the outer diameter of the movable lid 47 is about 1600 mmφ so that no gap is generated when the radial displacement measuring pipes 30 a, 30 b, 30 c, 30 d are moved to any position of the barrel 46.
In FIG. 4, the radial displacement measuring pipes 30a, 30b, 30c, 30d and the barrel 46 are illustrated so that there is almost no gap between them, but in reality, as described above, the radial displacement measuring pipe 30a. , 30b, 30c, and 30d have an outer diameter D1 of 100 mmφ, and the barrel 46 has an inner diameter D2 of about 800 mmφ.

A mirror body enclosure 36 is attached to the lower ends of the radial displacement measuring pipes 30a, 30b, 30c, and 30d.
In the mirror body storage enclosure 36, a first mirror body 37 inclined by about 45 ° with respect to the vertical or horizontal direction is stored.
The inclination angle of the first mirror body 37 can be within a range of 45 ° ± 10%.
With this inclination angle, it is possible to measure the intensity of the racer light that has been diffusely reflected by the inner tank side wall 3 and returned.
The first mirror body 37 is made of stainless steel or the like, and the reflection surface is polished in a mirror shape in order to improve the reflectivity of the laser beam.

Further, a cylindrical outlet tube 40 is attached to a position facing the inner tank side wall 3 on the side surface of the mirror body housing enclosure 36 so as to face the radial direction of the inner tank 1.
The mirror body housing enclosure 36 and the outlet tube 40 can be located at the middle or bottom of the inner tank side wall 3 but, as shown in FIG. It is preferable that it is located above the highest liquid level of the cryogenic liquid 13 in the inner tank 1.

  The radial displacement measuring pipes 30a, 30b, 30c, 30d, the mirror body housing enclosure 36, and the outlet cylinder 40 are opened in the inner tank 1, and the cryogenic gas that has been vaporized by the cryogenic liquid 13 during the measurement has a diameter of The directional displacement measuring pipes 30a, 30b, 30c, and 30d are entered.

Each radial displacement measuring device 26 is configured as described above, and the laser beams 39a, 39b, 39c, and 39d emitted from the laser type distance measuring devices 38a, 38b, 38c, and 38d are the first mirror surfaces. It is reflected by the body 37 and reaches the inner tank side wall 3.
A part of the laser beams 39a, 39b, 39c, and 39d irregularly reflected by the inner tank side wall 3 passes through the exit tube 40, and is reflected again by the first mirror bodies 37 to be respectively laser type distance measuring devices 38a. , 38b, 38c, 38d.
In this way, the measured values La, Lb, Lc of the radial direction displacement which are the distances from the respective laser type distance measuring devices 38a, 38b, 38c, 38d to the inner tank side wall 3 via the first mirror body 37. , Ld (or the measured values Lma, Lmb, Lmc of the new radial displacement, which is the distance from each laser type distance measuring device 38a, 38b, 38c, 38d to the inner tank side wall 3 via the first mirror body 37. , Lmd) is measured.

The radial displacement measuring pipes 30a, 30b, 30c, and 30d, the mirror body enclosure 36, and the inner surface of the outlet tube 40 are preferably treated or coated with a substance so as to absorb laser light.
In addition, the radial displacement measuring pipes 30a, 30b, 30c, 30d, the mirror surface housing enclosure 36, the first mirror surface body 37, and the outlet tube 40 are made of the same material so as not to be deformed due to a contraction difference during cool-down. It is preferable to do.
Further, the portion irradiated with the laser light 39a, 39b, 39c, 39d on the inner tank side wall 3 does not need to be specially processed or treated as long as it is irregularly reflected.
However, if the measurement becomes unstable, such as when the distance of the racer lights 39a, 39b, 39c, 39d is increased, a member that sufficiently reflects the laser light 39a, 39b, 39c, 39d is installed. Also good.

(Configuration of rotation direction displacement measuring device)
Next, a detailed configuration of the rotational direction displacement measuring device 27 will be described with reference to FIGS. 1, 2, and 5.
As shown in FIGS. 1 and 2, two rotational direction displacement measuring devices 27 constituted by rotational direction displacement measuring pipes 31a and 31b, laser type distance measuring devices 38e and 38f, etc. Near the periphery of the inner tank side wall 3, it is attached at an equal angle in the same horizontal plane.
This equal angle means 180 ° ± 20% when there are two rotational direction displacement measuring devices 27.
If it is assumed that the inner tank 1 is not distorted (not deformed into an ellipse or the like), it is possible to provide only one laser type distance measuring device 38e.
At this time, the distance Dp from the center of the outer tank upper lid 8 of each rotational direction displacement measuring device 27 is preferably the same as the mounting position of the radial direction displacement measuring device 26.

As shown in FIG. 5, each rotational displacement measuring device 27 has the same shape and size as the radial displacement measuring device 26 shown in FIG. , 38f, rotational direction displacement measuring pipes 31a, 31b (diameter D1), pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shutoff valve 35, mirror body storage enclosure 36, rotational direction measurement As a second mirror surface body 37, an outlet tube 40, a purge discharge pipe 22, a purge nitrogen gas supply pipe 23, and the like.
The rotational direction displacement measuring pipes 31 a and 31 b are supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8.
Therefore, the distance L from the lower end (or the pipe side flange 41) of the laser type distance measuring devices 38e and 38f to the second mirror surface body 37 is the laser type distance measuring device 38e of the radial displacement measuring device 26 shown in FIG. , 38f, the distance L from the lower end (or pipe side flange 41) to the mirror body 37 is the same.

Similarly to the radial direction displacement measuring device 26, the inner tank upper lid 4 through which each of the rotational direction displacement measuring pipes 31a and 31b penetrates has a large hole, and above the large hole, A barrel 46 (diameter D2) having a predetermined height for guiding the rotation direction displacement measuring pipes 31a and 31b is attached by welding or the like.
The height of the barrel 46 is set such that the particulate heat insulating material 12 filled on the inner tank upper lid 4 does not enter the inner tank 1, as in the radial displacement measuring device 26.
On the upper surface of the barrel 46, a ring-shaped movable lid 47 having the same shape as that of the radial displacement measuring device 26 is placed so as to be movable in the front-rear direction, the left-right direction, and the up-down direction.

The difference from the radial displacement measuring device 26 is that the mirror body is attached so that the irradiation direction of the reflected laser light is directed to the circumferential direction of the inner tank side wall 3.
And the vertical member 21 extended in the radial direction and the orthogonal | vertical direction of the inner tank side wall 3 is attached to the inner tank side wall 3 in the position facing the exit cylinder 40 for each rotation direction displacement measuring device 27. FIG.

Each rotational direction displacement measuring device 27 is configured as described above, and the laser beams 39e and 39f emitted from the laser type distance measuring devices 38e and 38f are reflected by the second mirror bodies 37 and vertically. The member 21 is reached.
A part of the laser beams 39e and 39f irregularly reflected by the vertical member 21 passes through the exit tube 40, is reflected by the second mirror body 37 again, and returns to the laser distance measuring devices 38e and 38f.
In this way, the measured values Le and Lf of the rotation direction displacement, which is the distance from the laser distance measuring devices 38e and 38f to the vertical member 21 via the first mirror body 37 (or each laser distance). Measured values Lme, Lmf) of new rotational direction displacements, which are distances from the measuring instruments 38a, 38b, 38c, 38d to the vertical member 21 via the first mirror body 37, are measured.
The measured values Le and Lf of the existing rotational direction displacement measured by the laser type distance measuring devices 38e and 38f (or the measured values Lme and Lmf of the new rotational direction displacement) are tank monitoring devices 70 (70a) described later. To be sent to.

(Configuration of inner tank height direction displacement measuring device)
Next, a detailed configuration of the inner tank height direction displacement measuring device 28 will be described with reference to FIGS. 1, 2, and 6.
As shown in FIGS. 1 and 2, the inner tank height direction displacement measuring device 28 constituted by the inner tank height direction displacement measuring pipe 32, the laser type distance measuring device 38g, etc. It is attached in the vicinity of the periphery of the tank upper lid 8 and the inner tank side wall 3.
At this time, the distance Dp from the center of the outer tank upper lid 8 of the inner tank height direction displacement measuring device 28 is preferably the same as the mounting position of the radial direction displacement measuring device 26.

As shown in FIG. 6, the inner tank height direction displacement measuring device 28 is the radial displacement measuring device shown in FIG. 4 except that the mirror body housing enclosure 36, the mirror body 37 and the outlet tube 40 are not provided. 26, the displacement measuring instrument storage box 34, the laser distance measuring instrument 38g, the pipe 32 for measuring the displacement in the height direction of the inner tank (diameter D1), the pipe side flange 41, the mounting bolt nut 44, It includes a displacement measuring instrument storage box side flange 45, a shutoff valve 35, a purge discharge pipe 22, a purge nitrogen gas supply pipe 23, and the like.
The inner tank height direction displacement measurement pipe 32 is supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8.

Similarly to the radial displacement measuring device 26, each inner tank upper lid 4 through which the inner tank height direction displacement measuring pipe 32 penetrates has a large hole, and above this large hole, A barrel 46 (diameter D2) having a predetermined height that guides the pipe 32 for measuring the displacement in the height direction of the inner tank is attached by welding or the like.
The height of the barrel 46 is set such that the particulate heat insulating material 12 filled on the inner tank upper lid 4 does not enter the inner tank 1, as in the radial displacement measuring device 26.
On the upper surface of the barrel 46, a ring-shaped movable lid 47 having the same shape as that of the radial displacement measuring device 26 is placed so as to be movable in the front-rear and left-right directions.

As described above, the difference from the radial displacement measuring device 26 is that the mirror body housing enclosure 36, the mirror body 37, and the outlet tube 40 shown in FIG.
The inner tank side wall 3 includes a horizontal member 20 for measuring the displacement in the height direction of the inner tank extending in the radial direction and the horizontal direction of the inner tank side wall 3, and a pipe 32 for measuring the displacement in the height direction of the inner tank. It is attached to the position facing each other.

The height direction displacement measuring device 28 of the inner tank is configured as described above, and the laser light 39g irradiated from each laser type distance measuring device 38g reaches the horizontal member 20.
Then, a part of the laser beam 39g irregularly reflected by the horizontal member 20 returns to the laser distance measuring device 38g.
Thus, the measurement value Lg of the displacement in the height direction of the existing inner tank from each laser type distance measuring device 38g to the horizontal member 20 (or the measurement value Lmg of the displacement in the height direction of the new inner tank) is measured. .
The measured value Lg of the displacement in the height direction of the existing inner tank (or the measured value Lmg of the displacement in the height direction of the new inner tank) measured by the laser type distance measuring device 38g is a tank monitoring device 70 (described later). 70a).

(Configuration of pipe shrinkage correction amount measuring device)
Next, a detailed configuration of the pipe contraction correction amount measuring device 29 will be described with reference to FIGS. 1, 2, and 7.
As shown in FIGS. 1 and 2, one pipe shrinkage correction amount measuring device 29 constituted by a pipe shrinkage correction pipe 33, a laser-type distance measuring device 38 h, etc. includes the outer tank upper lid 8 and the inner tank side wall 3. It is attached near the periphery.
At this time, the distance Dp from the center of the outer tub upper lid 8 of the pipe shrinkage correction amount measuring device 29 is also made the same as the mounting position of the radial direction displacement measuring device 26 and the rotational direction displacement measuring device 27.

As shown in FIG. 7, the pipe contraction correction amount measuring device 29 is shown in FIG. 4 except that a horizontal member 37d is horizontally attached to the lower end of the pipe for pipe contraction correction, and there is no outlet tube 40. 5 has the same shape and size as the radial direction displacement measuring device 26 and the rotational direction displacement measuring device 27 shown in FIG. 5, and includes a displacement measuring instrument storage box 34, a laser distance measuring instrument 38h, and a pipe contraction correcting pipe 33 (diameter D1). The pipe side flange 41, the mounting bolt nut 44, the displacement measuring instrument storage box side flange 45, the shut-off valve 35, the purge discharge pipe 22, the purge nitrogen gas supply pipe 23, and the like.
The pipe contraction correction pipe 33 is supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tub upper lid 8.

Similarly to the radial direction displacement measuring device 26 and the rotational direction displacement measuring device 27, the inner tank upper lid 4 through which the pipe contraction correcting pipe 33 penetrates has large holes, respectively, above the large holes. A barrel 46 (diameter D2) having a predetermined height for guiding the pipe contraction correcting pipe 33 is attached by welding or the like.
The height of the barrel 46 is the same as that of the radial direction displacement measuring device 26 or the rotational direction displacement measuring device 27 so that the particulate heat insulating material 12 filled on the inner tank upper lid 4 does not enter the inner tank 1. With a height.
On the upper surface of the barrel 46, a ring-shaped movable lid 47 having the same shape as that of the radial displacement measuring device 26 or the rotational displacement measuring device 27 is placed so as to be movable in the front-rear and left-right directions.

As described above, the difference from the radial direction displacement measuring device 26 or the rotational direction displacement measuring device 27 is that a horizontal member 37d is horizontally attached to the lower end of the pipe in the mirror body housing enclosure 36 as shown in FIG. There is in point.
The surface of the horizontal member 37d at the lower end of the pipe is not mirror-like, and the laser beam 39h is irregularly reflected.
At this time, the distance L from the lower end (or pipe side flange 41) of the laser distance measuring device 38h to the horizontal member 37d at the lower end of the pipe is the same as the distance L shown in FIG. 4 and the distance L shown in FIG. .

The pipe contraction correction amount measuring device 29 is configured as described above, and the laser light 39h irradiated from each laser type distance measuring device 38h reaches the horizontal member 37d at the lower end of the pipe.
A part of the laser beam 39h irregularly reflected by the horizontal member 37d at the lower end of the pipe returns to the laser distance measuring device 38h.
In this way, the pipe length measurement value Lh (or the new pipe length measurement value Lmh) from each laser type distance measuring device 38h to the horizontal member 37d at the lower end of the pipe is measured.
Then, the pipe length measurement value Lh (or the new pipe length measurement value Lmh) measured by the laser distance measuring device 38h is transmitted to a tank monitoring device 70 (70a) described later. .

In addition, when it is not necessary to measure the displacement (mainly contraction) of the inner tank 1 before and after the cool-down, or when the displacement (mainly contraction) of the inner tank 1 before and after the cool-down can be estimated, the pipe contraction correction is not necessarily performed. The quantity measuring device 29 is not necessary.
However, by providing the pipe shrinkage correction amount measuring device 29, it is possible to reliably measure the displacement of the inner tank 1 before and after the cool-down (not only simple shrinkage but also radial displacement and rotational displacement).

(Second embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a detailed side view of the radial displacement measuring device 26a or the rotational displacement measuring device 27a of the double-shell structure tank according to the second embodiment of the present invention.
The tank displacement measuring device according to the second embodiment of the present invention includes four (at least two) radial displacement measuring devices 26a, two (at least one) rotational displacement measuring devices 27a, and The inner tank height direction displacement measuring device 28, one pipe contraction correction amount measuring device 29, and the tank monitoring device 70 (70a) are the same as in the first and second embodiments of the present invention. Yes.
Further, a horizontal member 20 for measuring the displacement in the height direction of the inner tank and two (at least one) vertical member 21 for measuring the tank rotation are attached to the inner tank side wall 3.
Details of the tank monitoring device 70 (70a) will be described later.

The difference from the tank displacement measuring device according to the first embodiment of the present invention is that the radial displacement measuring device 26 and the rotational displacement measuring device 27 shown in FIGS. In addition, the radial direction displacement measuring device 26a and the rotational direction displacement measuring device 27a are omitted.
Other configurations such as the inner tank height direction displacement measuring device 28 (see FIG. 6), the pipe shrinkage correction amount measuring device 29 (see FIG. 7), and the like are the same as those of the first embodiment of the present invention. Have the same thing.

That is, as shown in FIG. 8, each radial displacement measuring device 26a includes a displacement measuring instrument storage box 34, laser distance measuring instruments 38a, 38b, 38c, 38d, and radial displacement measuring pipes 30a, 30b, 30c. 30d (diameter D1), pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shut-off valve 35, mirror body 37, outlet tube 40, purge discharge pipe 22, purge nitrogen gas supply pipe 23 Etc.
Each rotational direction displacement measuring device 27 has the same shape and size as the radial direction displacement measuring device 26, and includes a displacement measuring device storage box 34, laser distance measuring devices 38e and 38f, a rotational direction displacement measuring pipe 31a, 31b, pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shut-off valve 35, mirror surface body 37, outlet tube 40, purge discharge pipe 22, purge nitrogen gas supply pipe 23, and the like. Yes.
The radial displacement measuring pipes 30a, 30b, 30c, 30d and the rotational displacement measuring pipes 31a, 31b are supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8. Yes.

  The lower end portions of the radial direction displacement measuring pipes 30a, 30b, 30c, 30d and the rotational direction displacement measuring pipes 31a, 31b are directly attached to the mirror body 37 at an angle of 45 ° ± 20% with respect to the vertical or horizontal direction. A radial direction displacement measuring device 26a and a rotational direction displacement measuring device 27a are provided.

Holes for passing laser light are formed in the lower side surfaces of the radial direction displacement measuring pipes 30a, 30b, 30c, 30d and the rotational direction displacement measuring pipes 31a, 31b.
An outlet tube 40 is attached to the hole.
Note that the outlet tube 40 is not necessarily required, and may simply be a hole.
The radial displacement measuring pipes 30a, 30b, 30c, 30d, the mirror body 37, and the outlet tube 40 are preferably made of the same material so as not to be deformed due to a shrinkage difference during cool-down.

  According to the above-described double-shell structure tank device, tank displacement measuring device, or tank equipment according to the second embodiment of the present invention, the radial displacement is relative to that of the first embodiment of the present invention. The structures of the measurement pipes 30a, 30b, 30c, 30d and the rotation direction displacement measurement pipes 31a, 31b can be simplified.

(Third embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a third embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a detailed side view of the radial displacement measuring device 26b of the double-shell structure tank according to the third embodiment of the present invention.
The tank displacement measuring device according to the third embodiment of the present invention includes one radial displacement measuring device 26b, two (at least one) rotational displacement measuring devices 27 and 27a, and one inner tank. The height direction displacement measuring device 28, one pipe contraction correction amount measuring device 29, and a tank monitoring device 70 are included.
Further, a horizontal member 20 for measuring the displacement in the height direction of the inner tank and two (at least one) vertical member 21 for measuring the tank rotation are attached to the inner tank side wall 3.
Details of the tank monitoring device 70 will be described later.

The difference from the tank displacement measuring apparatus according to the first and second embodiments of the present invention is that the radial displacement measuring apparatus 26 can measure the radial displacement in a plurality of directions as shown in FIG. One radial displacement measuring device 26b is used.
In the following, a case where four directions are measured will be described as an example, but the measurement can be similarly performed in the case of measurement in two directions, three directions, or five directions or more.
Other configurations, rotational direction displacement measuring devices 27 and 27a (see FIGS. 5 and 9), inner tank height direction displacement measuring device 28 (see FIG. 6), and pipe contraction correction amount measuring device 29 (see FIG. 7). ) And the like are the same as those in the first and second embodiments of the present invention.

That is, as shown in FIG. 9, the radial displacement measuring device 26b includes one displacement measuring instrument storage box 34 and four laser distance measuring instruments stored in one displacement measuring instrument storing box 34. 38 a, 38 b, 38 c, 38 d, radial displacement measuring pipe 30, pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shut-off valve 35, one mirror body storage enclosure 36 The mirror body 37 accommodated in the shape of a pyramid, the outlet tube 40, the purge discharge pipe 22, the purge nitrogen gas supply pipe 23, and the like are included.
The radial displacement measuring pipe 30 is supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8.

The four laser type distance measuring instruments 38a, 36b, 36c, 36d are accommodated in one displacement measuring instrument storage box 34.
The four mirror bodies 37 are also attached in the shape of a quadrangular pyramid within one mirror body housing enclosure 36.
On each of the four side surfaces of the mirror body housing enclosure 36, outlet cylinders 40 are attached.
Note that the outlet tube 40 is not necessarily required, and may simply be a hole.
Further, in the radial direction displacement measuring device 26b, the laser beams 39a, 39b, 39c, and 39d irradiated from the outlet tube 40 are respectively converted into the cryogenic fluid carry-in / out pipe 15 shown in FIGS. Installed at a position where it does not interfere with the measurement pipe.
The diameter D3 of the radial displacement measuring pipe 30 is preferably about 200 mm.
The inner diameter D4 of the barrel 46 is about 900 mmφ.

  According to the displacement measuring apparatus for the double-shell structure tank according to the third embodiment of the present invention, the radial displacement is measured by one diameter with respect to those of the first and second embodiments of the present invention. Since it can be integrated into the directional displacement measuring device 26b, there is an advantage that attachment becomes easy.

(Fourth embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 10 is a detailed side view of the radial displacement measuring device 26c of the double-shell structure tank according to the fourth embodiment of the present invention.
The tank displacement measuring device according to the fourth embodiment of the present invention includes one radial displacement measuring device 26c, two (at least one) rotational displacement measuring devices 27 and 27a, and one inner tank. The height direction displacement measuring device 28, one pipe contraction correction amount measuring device 29, and a tank monitoring device 70 are included.
The radial displacement measuring pipe 30 is supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8.
Further, a horizontal member 20 for measuring the displacement in the height direction of the inner tank and two (at least one) vertical member 21 for measuring the tank rotation are attached to the inner tank side wall 3.
Details of the tank monitoring device 70 will be described later.

The difference from the tank displacement measuring device (see FIG. 9) according to the third embodiment of the present invention is that the radial displacement measuring device 26 is added to the displacement measuring device storage box 34 as shown in FIG. The laser type distance measuring device 38 and the laser beam path changing device 43 are accommodated.
Other configurations, rotational direction displacement measuring devices 27 and 27a (see FIGS. 5 and 8), inner tank height direction displacement measuring device 28 (see FIG. 6), and pipe contraction correction amount measuring device 29 (see FIG. 7). ) And the like are the same as those of the first, second and third embodiments of the present invention.

That is, as shown in FIG. 10, the radial displacement measuring device 26c includes one displacement measuring device storage box 34, one laser distance measuring device 38, a laser beam path changing device 43, and a radial displacement measuring pipe. 30, pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shut-off valve 35, mirror surface body 37 stored in the shape of a quadrangular pyramid in one mirror surface body storage enclosure 36, outlet tube 40, A purge discharge pipe 22, a purge nitrogen gas supply pipe 23, and the like are included.
Note that the outlet tube 40 is not necessarily required, and may simply be a hole.

On the upper surface of the pipe-side flange 41, a laser light transmission pressure-resistant plate 42 capable of transmitting laser light is attached by a mounting bolt nut 44.
A displacement measuring instrument storage box 34 having a displacement measuring instrument storage box side flange 45 is connected to the upper surface of the laser light transmission pressure-resistant plate 42.
In the displacement measuring instrument storage box 34, one laser type distance measuring instrument 38 and a laser beam path changing unit 43 for changing the optical path of the laser beam emitted from the laser type distance measuring instrument 38 are stored.

The laser beam path changer 43 may be configured by, for example, two reflecting plates, and the two reflecting plates are turned by a turning device (not shown).
Or it is good also as a thing of the structure which changes the direction of the laser type distance measuring device 38 with a drive device not shown.

  According to the displacement measuring apparatus for a double-shell structure tank according to the fourth embodiment of the present invention, a laser-type distance measuring device is further provided for the third embodiment (see FIG. 9) of the present invention. The number of 38 can be reduced.

(Fifth embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 11 is a detailed side view of the radial displacement measuring device 26d of the double-shell structure tank according to the fifth embodiment of the present invention.
The tank displacement measuring device according to the fifth embodiment of the present invention includes one radial displacement measuring device 26d, two (at least one) rotational displacement measuring devices 27 and 27a, and one inner tank. The height direction displacement measuring device 28, one pipe contraction correction amount measuring device 29, and a tank monitoring device 70 are included.
Further, a horizontal member 20 for measuring the displacement in the height direction of the inner tank and two (at least one) vertical member 21 for measuring the tank rotation are attached to the inner tank side wall 3.
Details of the tank monitoring device 70 will be described later.

The difference from the tank displacement measuring apparatus (see FIG. 9) according to the third embodiment of the present invention is that a radial displacement measuring apparatus 26d is added to the displacement measuring instrument storage box 34 as shown in FIG. The laser type distance measuring device 38 is eccentrically stored.
Other configurations, rotational direction displacement measuring devices 27 and 27a (see FIGS. 5 and 8), inner tank height direction displacement measuring device 28 (see FIG. 6), and pipe contraction correction amount measuring device 29 (see FIG. 7). ) And the like are the same as those of the first, second and third embodiments of the present invention.

That is, as shown in FIG. 11, the radial displacement measuring device 26d includes one displacement measuring device storage box 34, one laser type distance measuring device 38, and the third embodiment of the present invention. Are stored in the shape of a quadrangular pyramid in the pipe 30 for radial displacement measurement, the pipe side flange 41, the mounting bolt nut 44, the displacement measuring instrument storage box side flange 45, the shutoff valve 35, and the single mirror body storage enclosure 36. The mirror body 37, the outlet tube 40, the purge discharge pipe 22, and the purge nitrogen gas supply pipe 23 are configured.
Note that the outlet tube 40 is not necessarily required, and may simply be a hole.

On the upper surface of the pipe-side flange 41, a displacement measuring instrument storage box 34 is attached by a mounting bolt nut 44.
In the displacement measuring instrument storage box 34, one laser type distance measuring instrument 38 is stored eccentrically.
In this case, the displacement measuring instrument storage box side flange 45 of the displacement measuring instrument storage box 34 can be attached to the pipe side flange 41 by the mounting bolt nut 44 at the positions of 0 °, 90 °, 180 °, and 270 °. It is like that.

  According to the displacement measuring apparatus for a double-shell structure tank according to the fifth embodiment of the present invention, a laser beam path changer 43 is further provided for the fourth embodiment (see FIG. 10) of the present invention. There is an advantage that it can be omitted.

(Sixth embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a sixth embodiment of the present invention will be described with reference to FIG.
FIG. 12 is a detailed side view of the radial / rotational direction displacement measuring device 26e of the double-shell structure tank according to the sixth embodiment of the present invention.
The tank displacement measuring device according to the sixth embodiment of the present invention includes a radial displacement measuring device 26e that also serves to measure two rotational displacements, two rotational displacement measuring devices 27, 27a, and one. The inner tank height direction displacement measuring device 28, one pipe shrinkage correction amount measuring device 29, and a tank monitoring device 70 (70a).
Further, a horizontal member 20 for measuring the displacement in the height direction of the inner tank and two vertical members 21 for measuring the tank rotation are attached to the inner tank side wall 3.
Details of the tank monitoring device 70 (70a) will be described later.

The difference from the tank displacement measuring devices (see FIGS. 1 to 8) according to the first and second embodiments of the present invention is that, among the four radial displacement measuring devices 26a, 26b, 26c, and 26d, for example, As shown in FIG. 12, the two radial displacement measuring devices 26 are the radial and rotational displacement measuring devices 26e that also serve as the rotational displacement measurement.
Regarding the other two radial displacement measuring devices 26, the inner tank height displacement measuring device 28 (see FIG. 6), the pipe shrinkage correction measuring device 29 (see FIG. 7), etc. The same thing as the thing of the 1st, 2nd embodiment of this invention is provided.

That is, as shown in FIG. 12, the radial displacement measuring device 26e of the rotational direction displacement measuring / combining type includes one displacement measuring device storage box 34 and one laser type distance measuring device 38, and the radial direction rotating / rotating device. Directional displacement measuring pipe 30e, pipe-side flange 41, mounting bolt nut 44, displacement measuring instrument storage box-side flange 45, shut-off valve 35, and two mirror-shaped body storage enclosures 36 housed in a quadrangular pyramid shape. The mirror body 37b, the outlet tube 40, the purge discharge pipe 22 and the purge nitrogen gas supply pipe 23 are constituted.
The radial / rotational direction displacement measuring pipe 30e is supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8.
Note that the outlet tube 40 is not necessarily required, and may simply be a hole.
In this case, the diameter D5 of the radial / rotational direction displacement measuring pipe 30e is preferably about 150 mm.
The inner diameter D6 of the barrel 46 can be about 850 mmφ.

On the upper surface of the pipe-side flange 41, a displacement measuring instrument storage box 34 is attached by a mounting bolt nut 44.
In the displacement measuring instrument storage box 34, one laser type distance measuring instrument 38 is stored eccentrically.
In this case, the displacement measuring device storage box side flange 45 of the displacement measuring device storage box 34 is attached to the pipe side flange 41 by a mounting bolt nut 44 at a position of 0 °, 90 ° (or 0 °, 180 °). It has become possible.

When the displacement measuring instrument storage box side flange 45 is connected to the pipe side flange 41 at a position of 0 °, the laser light 39b, 39d reflected by the mirror body 37b is irradiated to the inner tank side wall 3. Measure radial displacement.
When the displacement measuring instrument storage box side flange 45 is connected to the pipe side flange 41 at a position of 90 ° (or 180 °), the laser beam 39e reflected by the mirror body 37b is measured for tank rotation. Since the vertical member 21 is irradiated, the displacement in the rotational direction is measured.

Thus, from the two radial / rotational displacement measuring devices 26e, the measured values Lb and Ld of the existing radial displacement, the measured values Le and Lf of the existing rotational displacement, or the new radial displacement measured. Values Lmb, Lmd, Lme, Lmf) are measured.
From the other two radial displacement measuring devices 26, the measured values La and Lc of the existing radial displacement (or the measured values Lma and Lmc of the new radial displacement) are obtained as in the first embodiment. It is measured.
And these measured values are transmitted to the tank monitoring apparatus 70 (70a) mentioned later.

  According to the displacement measuring apparatus of the double shell structure tank according to the sixth embodiment of the present invention, the rotational direction displacement measurement dedicated to the rotational direction displacement measuring apparatus 27 is different from that of the third embodiment of the present invention. There is an advantage that the pipes 31a and 31b can be omitted.

(Seventh embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a seventh embodiment of the present invention will be described with reference to FIG.
FIG. 13 is a detailed side view of a radial displacement and pipe contraction correction amount measuring apparatus for a double-shell structure tank according to a seventh embodiment of the present invention.
The tank displacement measuring device according to the seventh embodiment of the present invention includes a radial displacement / pipe shrinkage correction amount measuring device 26f that also serves to measure one pipe shrinkage correction amount, and three rotational direction displacement measuring devices. 27, 27a, one inner tank height direction displacement measuring device 28 and a tank monitoring device 70.
Further, a horizontal member 20 for measuring the displacement in the height direction of the inner tank and two vertical members 21 for measuring the tank rotation are attached to the inner tank side wall 3.
Details of the tank monitoring device 70 will be described later.

The difference from the tank displacement measuring devices (see FIGS. 1 to 8) according to the first and second embodiments of the present invention is that, among the four radial displacement measuring devices 26a, 26b, 26c, and 26d, for example, As shown in FIG. 13, one radial displacement measuring device 26d is a radial displacement / pipe shrinkage correction amount measuring device 26f that also serves to measure the pipe shrinkage correction amount.
The other configurations of the three radial direction displacement measuring devices 26a, 26b, 26c, the inner tank height direction displacement measuring device 28 (see FIG. 6) and the like are the first and second embodiments of the present invention. It has the same thing.

That is, as shown in FIG. 13, the radial displacement measuring device 26f that also serves to measure the pipe contraction correction amount includes one displacement measuring instrument storage box 34, one laser distance measuring instrument 38, and FIG. Laser beam path changer 43, radial displacement and pipe contraction correction amount measuring pipe 30f, pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shut-off valve 35, one mirror body storage enclosure An inclined pipe lower end mirror body 37c and a horizontal member 37d, a mirror body 37, an outlet cylinder 40, a purge discharge pipe 22, and a purge nitrogen gas supply pipe 23 housed in the pipe 36 are constituted.
The radial displacement and pipe contraction correction amount measuring pipe 30 f is supported by a pipe support 19 attached to the lower surface of the metal plate 48 of the outer tank upper lid 8.
Note that the outlet tube 40 is not necessarily required, and may simply be a hole.
In this case, the diameter D5 of the radial displacement / pipe shrinkage correction amount measuring pipe 30f is preferably about 150 mm.
The inner diameter D6 of the barrel 46 can be about 850 mmφ.

In such a configuration, the laser beam 39d positioned on the right side of the radial displacement / pipe contraction correction amount measuring pipe 30f is reflected by the mirror body 37c at the lower end of the inclined pipe and is irradiated to the inner tank side wall 3, so Measure the displacement.
Further, the laser beam 39h located on the left side of the radial displacement and pipe contraction correction amount measurement pipe 30f is reflected and returned by the horizontal member 37d, so the pipe contraction correction amount is measured.

Thus, from the radial displacement and pipe contraction correction amount measuring device 26f, the measurement value Ld of the existing radial displacement, the measurement value Lh of the existing pipe length (or the measurement value Lmd of the new radial displacement, the new pipe length). Measurement value Lmh) is measured.
From the other three radial displacement measuring devices 26, measured values La, Lb, Lc of the existing radial displacement (or measured values Lma, Lmb, Lmc of the new radial displacement) are measured.
And these measured values are transmitted to the tank monitoring apparatus 70 mentioned later.

  According to the displacement measuring apparatus for a double-shell structure tank according to the seventh embodiment of the present invention, the pipe dedicated to the pipe shrinkage correction amount measuring apparatus 29 is different from that of the first and second embodiments of the present invention. There is an advantage that the shrinkage correction pipe 33 can be omitted.

(Eighth embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to an eighth embodiment of the present invention will be described.
In the double-shell structure tank device and the tank displacement measuring device according to the first to sixth embodiments of the present invention, pipe shrinkage correction amount measurement is provided with a dedicated laser-type distance measuring device 38h before and after the cool-down. The expansion / contraction amount of the pipe contraction correction pipe 33 was corrected.

  On the other hand, in this embodiment, instead of the laser distance measuring device 38h, a multi-pair thermometer is installed on the inner surface of the pipe contraction correction pipe 33 every 1 m, and the temperature at a constant interval is set. The pipe contraction amount is corrected by calculating the contraction amount of the pipe contraction correction pipe 33 in the vicinity of each thermometer based on the monitored and measured temperature of each thermometer.

(Ninth embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a ninth embodiment of the present invention will be described with reference to FIGS.
FIG. 14 is a partial sectional side view of a radial displacement measuring device for a double-shell structure tank according to a ninth embodiment of the present invention.
FIG. 15 is an enlarged view of a portion A in FIG.
FIG. 16 is a plan view of a rotational direction displacement measuring device for a double-shell structure tank according to a ninth embodiment of the present invention.
FIG. 17 is a partial cross-sectional side view of the height direction displacement measuring device for the inner tank of the double-shell structure tank according to the ninth embodiment of the present invention.
FIG. 18 is an enlarged view of a portion B in FIG.

  The tank displacement measuring apparatus according to the ninth embodiment of the present invention has four (at least two) radial displacement measuring apparatuses 50 and two, similar to the first embodiment of the present invention. It is composed of (at least one) rotational direction displacement measuring device 51, one inner tank height direction displacement measuring device 52, and tank monitoring device 70 (70a).

The difference from the first embodiment of the present invention is that a pipe for each measuring device is provided between the inner tank side wall 3 and the outer tank 5 (the outer surface side of the inner tank side wall 3) as will be described later. It is in the point.
In addition, since the particulate heat insulating material 12 etc. are filled between the inner tank side wall 3 and the outer tank 5, the temperature around each pipe is not so different from the temperature of the outside air, and the contraction amount of the pipe is Can be ignored.
Therefore, the pipe contraction correction amount measuring device 29 in the first embodiment of the present invention is unnecessary.
On the other hand, a structure for ensuring the measurement position in the filler is provided.
Specifically, a connection pipe that connects each measurement position and the measurement pipe is provided.
The overall structure of the double-shell structure tank is the same as that of the first embodiment of the present invention.
The same reference numerals as those in the first embodiment of the present invention are the same constituent members.

(Configuration of radial displacement measuring device)
First, a detailed configuration of the radial displacement measuring device 50 will be described with reference to FIGS.
As shown in FIG. 14, four radial displacement measuring devices 50 constituted by radial displacement measuring pipes 55a, 55b, 55c, 55d, laser type distance measuring instruments 38a, 38b, 38c, 38d, and the like. The metal plate 48 on the inner surface of the outer tank 5 and the inner tank side wall 3 are attached at equal angles on the same horizontal plane.

  Each radial displacement measuring device 50 includes a displacement measuring instrument storage box 34, laser distance measuring instruments 38a, 38b, 38c, 38d, radial displacement measuring pipes 55a, 55b, 55c, 55d, and a laser transmitter / receiver seat. By pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shut-off valve 35, mirror body housing 59, displacement measuring mirror body 60, outlet pipe 62, inner tank wall connection bellows 63, etc. It is configured.

Each radial displacement measuring pipe 55a, 55b, 55c, 55d penetrates the outer tank upper lid 8 and the airtight metal plate 48 and extends in the vertical direction, and the metal plate 48 on the inner surface of the outer tank 5 and the inner tank It is provided close to the inner tank side wall 3 so as to pass between the side wall 3.
In portions where the radial displacement measuring 55a, 55b, 55c, and 55d penetrate the outer tank upper lid 8 and the airtight metal plate 48, seals (not shown) are provided so that natural gas does not leak to the outside in order to maintain airtightness. Material is provided.
The lower portions of the radial displacement measuring pipes 55a, 55b, 55c, and 55d are supported by a pipe support 61 that extends horizontally from the metal plate 48 on the inner surface of the outer tank side wall 7 toward the center of the tank.

  And the tank center side of the mirror body storage enclosure 59 has the outlet pipe 62 fixed to the side surface of the mirror body storage enclosure 59, and the inner tank whose both ends are fixed to the outlet pipe 62 and the outer surface of the inner tank side wall 3 as the connection pipe described above. The wall connection bellows 63 is connected to the outer surface of the inner tank side wall 3 so that it can cope with the deformation of the inner tank 1 in the radial direction and the rotation direction.

Each radial displacement measuring device 50 is configured as described above, and the laser beams 39a, 39b, 39c, and 39d emitted from the laser type distance measuring devices 38a, 38b, 38c, and 38d are transmitted through the mirror bodies 60, respectively. It is reflected, passes through the outlet pipe 62 and the inner tank wall connecting bellows 63, and reaches the outer surface of the inner tank side wall 3.
A part of the laser beams 39a, 39b, 39c, and 39d diffusely reflected on the outer surface of the inner tank side wall 3 passes through the inner tank wall connecting bellows 63 and the outlet pipe 62 again, and is reflected by each mirror body 60. It returns to each laser type distance measuring instrument 38a, 38b, 38c, 38d.

Thus, the measured value of the radial displacement from each laser type distance measuring device 38a, 38b, 38c, 38d to the outer surface of the inner tank side wall 3 is measured.
The measured values of the radial displacement measured by the laser type distance measuring devices 38a, 38b, 38c, 38d for measuring the radial displacement are transmitted to the tank monitoring device 70 (70a) as will be described later. It has become.

(Configuration of rotation direction displacement measuring device)
Next, a detailed configuration of the rotational direction displacement measuring device 51 will be described with reference to FIG.
As shown in FIG. 16, two rotational direction displacement measuring devices 51 constituted by a rotational direction displacement measuring pipe (not shown), laser type distance measuring devices 38e, 38f, etc. 48 and the inner tank side wall 3 are attached at equal angles (180 ° ± 20%) in the same horizontal plane.
Further, two vertical members 69 for tank rotation measurement are attached to the outer surface of the inner tank side wall 3.
The other configuration is the same as that of the radial displacement measuring device 50 except that one end of the inner tank wall connecting bellows is fixed to the vertical member 69.

Each rotational direction displacement measuring device 51 is configured as described above, and the laser beams 39e and 39f emitted from the laser type distance measuring devices 38e and 38f are reflected by the mirror bodies and reach the vertical member 69. To do.
A part of the laser beams 39e and 39f irregularly reflected by the vertical member 69 is reflected again by the mirror bodies and returns to the laser distance measuring devices 38e and 38f.
In this way, the measured value of the rotational displacement from each laser type distance measuring device 38e, 38f to the vertical member 69 is measured.
And the measured value of the rotation direction displacement measured by the laser type distance measuring devices 38e and 38f is transmitted to a tank monitoring device 70 (70a) described later.

(Configuration of inner tank height direction displacement measuring device)
Next, a detailed configuration of the inner tank height direction displacement measuring device 52 will be described with reference to FIGS. 17 and 18.
As shown in FIG. 17, the inner tank height direction displacement measuring device 52 constituted by the inner tank height direction displacement measuring pipe 57, the laser-type distance measuring device 38 g, etc. is provided with the outer tank upper lid 8. And it penetrates the metal plate 48 and is attached along the inner side of the outer tub side wall 7.
At this time, the distance from the center of the outer tank upper lid 8 of the inner tank height direction displacement measuring device 52 is preferably the same as the mounting position of the radial direction displacement measuring apparatus 50.

The inner tank height direction displacement measuring device 52 includes a displacement measuring device storage box 34, a laser distance measuring device 38g, an inner tank height direction displacement measuring pipe 57, a pipe side flange 41, a mounting bolt nut 44, and a displacement measurement. It is comprised by the container storage box side flange 45, the shut-off valve 35, etc.
Further, a horizontal member support leg 64 extending upward is attached to the outer upper part of the inner tank side wall 3, and a horizontal member 65 for measuring the displacement in the height direction of the inner tank is attached to the upper end of the horizontal member support leg 64. It is attached.
The inner tank height direction displacement measuring pipe 57 and the inner tank height direction displacement measuring horizontal member 65 are connected by a horizontal member connecting bellows 66.

The inner tank height direction displacement measuring device 52 is configured as described above, and the laser light emitted from each laser distance measuring device 38g reaches the horizontal member 65 for measuring the inner tank height direction displacement. To do.
A part of the laser beam irregularly reflected by the horizontal member 65 for measuring the displacement in the height direction of the inner tank returns to the laser distance measuring device 38g.
In this way, the measured value Lg of the displacement in the height direction of the inner tank from each laser type distance measuring device 38g to the horizontal member 65 for measuring the displacement in the height direction of the inner tank is measured.
And the measured value Lg of the displacement in the height direction of the existing tank measured by the laser type distance measuring device 38g is transmitted to a tank monitoring device 70 (70a) described later.

(Tenth embodiment of the present invention)
Next, a double-shell structure tank device, a tank displacement measuring device, and tank equipment according to a tenth embodiment of the present invention will be described with reference to FIGS.
FIG. 19 is a partial sectional side view of a radial displacement measuring device for a double-shell structure tank according to a tenth embodiment of the present invention.
FIG. 20 is an enlarged view of part A in FIG.
The tank displacement measuring device according to the tenth embodiment of the present invention includes two (at least two) radial displacement measuring devices 50a and 2 in the same manner as the ninth embodiment of the present invention. It is comprised by the piece (at least 1) rotational direction displacement measuring device 51, the height direction displacement measuring device 52 of the 1 inner tank, and the tank monitoring apparatus 70 (70a).

  The difference from the ninth embodiment of the present invention is that, as will be described later, the pipe for each measuring device is connected between the inner tank side wall 3 and the outer tank 5 (the inner tank side wall 3 It is in the point provided in the vicinity of the outer tub 5 on the outer surface side).

  That is, four radial displacement measuring devices 50a constituted by radial displacement measuring pipes 55a, 55b, 55c, 55d, laser distance measuring instruments 38a, 38b, 38c, 38d, and the like are provided on the inner surface of the outer tub 5. Are attached at equal angles in the same horizontal plane in the vicinity of the outer tank 5 between the metal plate 48 and the inner tank side wall 3.

  Each radial displacement measuring device 50a includes a displacement measuring instrument storage box 34, laser distance measuring instruments 38a, 38b, 38c, 38d, radial displacement measuring pipes 55a, 55b, 55c, 55d, and a laser transmitter / receiver seat. Pipe side flange 41, mounting bolt nut 44, displacement measuring instrument storage box side flange 45, shutoff valve 35, mirror body housing 59, displacement measuring mirror body 60, outlet pipe 62, inner tank wall side thick pipe 67, seal rubber 68 or the like.

Each radial displacement measuring pipe 55a, 55b, 55c, 55d penetrates the outer tank upper lid 8 and the airtight metal plate 48 and extends in the vertical direction, and the metal plate 48 on the inner surface of the outer tank 5 and the inner tank It is provided close to the outer tank side wall 7 so as to pass between the side wall 3.
In portions where the radial displacement measuring 55a, 55b, 55c, and 55d penetrate the outer tank upper lid 8 and the airtight metal plate 48, seals (not shown) are provided so that natural gas does not leak to the outside in order to maintain airtightness. Material is provided.
The lower portions of the radial displacement measuring pipes 55a, 55b, 55c, and 55d are supported by a pipe support 61 that extends horizontally from the metal plate 48 on the inner surface of the outer tank side wall 7 toward the center of the tank.

The tank central side surface of the mirror body storage enclosure 59 has an outlet pipe 62 fixed to the side surface of the mirror body storage enclosure 59, and an inner tank wall side thick pipe that is larger in diameter than the outlet pipe 62 and fixed to the outer surface of the inner tank side wall 3. 67 is connected to the outer surface of the inner tank side wall 3 so that it can cope with the radial deformation and the rotational deformation of the inner tank 1.
A cylindrical seal rubber 68 is interposed between the outlet pipe 62 and the inner tank wall side thick pipe 67.

(Configuration of first example of tank monitoring device)
Next, a configuration of a first example of the tank monitoring device will be described with reference to FIG.
FIG. 21 is a block diagram of a first example of the tank monitoring apparatus in each embodiment of the present invention.
The tank monitoring device of the first example includes a first embodiment (see FIGS. 1 to 7), a second embodiment (see FIG. 8), a sixth embodiment (see FIG. 12), The seventh embodiment (see FIG. 13), the eighth embodiment, the ninth embodiment (see FIGS. 14 to 18) and the tenth embodiment (see FIGS. 19 and 20) It is applicable to.

  Also, four radial displacement measuring devices 26, 26a, 26e, 26f, 50, 50a installed at equal intervals (90 ° ± several percent) and two at equal intervals (180 ° ± several percent). Rotational direction displacement measuring devices 27, 26e and 51, one inner tank height direction displacement measuring device 28 and 52, and one pipe contraction correction amount measuring device 29 (or thermometer) are required. .

  As shown in FIG. 21, the tank monitoring device 70a includes an expansion / contraction amount calculator 82, a center position calculator 83, a rotation direction calculator 84, an abnormal value detector 85, an alarm indicator lamp 86, a display / recorder 87, and the like. It is comprised by.

First, each laser distance measuring device 38a, 38b, 38c, 38d of the four radial displacement measuring devices 26a, 26b, 26c, 26d shown in FIG. 1, FIG. 2, FIG. 3, FIG. Measured values La, Lb, Lc, Ld of radial displacement, which are distances from the formula distance measuring instruments 38a, 38b, 38c, 38d to the inner tank side wall 3 via the first mirror body 37, are measured.
The measured values La, Lb, Lc, and Ld of the four measured radial displacements are displayed on the machine-side display 81, the center position calculator 83, the abnormal value detector 85, and the display of the tank monitoring device 70a. Is sent to the recorder / recorder 87.
For the sake of explanation, the measured values La and Lc of the radial displacement are assumed to be the y direction, and the measured values Lb and Ld of the radial displacement are assumed to be the x direction.

In the center position calculator 83, the displacement in the x direction and the displacement in the y direction of the center O of the inner tub 1 are calculated by the following equations.
x-direction displacement Δx = (Ld−Lb) / 2,
y-direction displacement Δy = (La−Lc) / 2 (Formula 1)
The calculated radial displacement (Δx, Δy) is transmitted to the rotation direction calculator 84, the abnormal value detector 85, and the display / recorder 87.
In the abnormal value detector 85, when the displacement (Δx, Δy) of the center O becomes an allowable value abnormality, it is determined as abnormal and the alarm indicator lamp 86 is turned on.
Note that the measured values La, Lb, Lc, and Ld of the radial displacements are from the laser distance measuring instruments 38a, 38b, 38c, and 38d to the inner tank side wall 3 via the first mirror body 37 as described above. In the calculation of the difference (Ld−Lb) and (La−Lc) in the above equation 1, each laser type distance measuring instrument 38a, 38b, 38c, 38d to each first mirror body 37 Are offset, and only the difference in distance from each first mirror body 37 to each inner tank side wall 3 is obtained.

In addition, the laser distance measuring devices 38e and 38f of the two rotational direction displacement measuring devices 27 shown in FIGS. Measured values Le and Lf of the rotational displacement, which are distances to the vertical members 21 via the mirror body 37, are measured.
The measured values Le and Lf of the two measured rotational displacements are displayed on the machine-side display 81 and transmitted to the pipe length corrector 71 of the tank monitoring device 70a.

Further, the pipe length measurement value Lh is measured by the laser distance measuring device 38h of the pipe contraction correction amount measuring device 29 shown in FIGS.
The measured value Lh of the measured pipe length is displayed on the machine-side display 81 and transmitted to the pipe length corrector 71 and the display / recorder 87 of the tank monitoring device 70a.

Alternatively, the temperature measured by the multi-pair thermometer 80 installed every 1 m on the inner surface of the pipe contraction correction pipe 33 is displayed on the machine-side display 81 and the tank monitoring device 70a. The data is transmitted to the expansion / contraction amount calculator 82 and the display / recorder 87.
The expansion / contraction amount calculator 82 calculates the pipe length measurement value Lh of the rotational direction displacement measurement pipes 31a and 31b based on the measured temperature, and transmits it to the pipe length corrector 71 and the display / recorder 87. .

In the pipe length corrector 71, based on the measured values Le and Lf of the rotational displacement and the measured value Lh of the pipe length, two rotational displacements ΔLe and ΔLf are calculated by the following equations.
Rotational displacement ΔLe = (Le−Lh),
Rotational displacement ΔLf = (Lf−Lh) (Formula 2)
The calculated rotational displacements ΔLe and ΔLf are transmitted to the rotational direction calculator 84, the abnormal value detector 85, and the display / recorder 87.

In the rotation direction calculator 84, assuming that the radius of the inner tank side wall 3 is Dt, the rotation direction displacement amount Δφ (rotation angle) is calculated by the following expression based on the rotation displacement ΔLe and the rotation displacement ΔLf.
Rotation direction displacement amount Δφ = tan ⁻¹ ((ΔLe + ΔLf) / Dt) (Formula 3)
The calculated rotational direction displacement amount Δφ is transmitted to the abnormal value detector 85 and the display / recorder 87.
In the abnormal value detector 85, when the rotational direction displacement amount Δφ becomes an allowable value abnormality, it is determined as abnormal and the alarm indicator lamp 86 is turned on.

Summarizing Formula 1 and Formula 2, the following formula is obtained, and the rotational displacement can be measured and calculated regardless of the radial displacement (Δx, Δy).
Rotation direction displacement amount Δφ = tan ⁻¹ ((Le + Lf−2Lh) / 2Dt) (Formula 4)

(Configuration of second example of tank monitoring device)
Next, the displacement state of the inner tank 1 and the configuration of the second example of the tank monitoring device 70 will be described with reference to FIGS.
FIG. 22 is an explanatory diagram showing the measurement principle of the second example of the tank monitoring device in each embodiment of the present invention.
FIG. 23 is a block diagram of a tank monitoring apparatus of a second example of the tank monitoring apparatus in each embodiment of the present invention.
In addition, the thing of the 2nd example of the tank monitoring apparatus 70 is applicable to the thing of 1st Embodiment-10th Embodiment.

In the above-described double shell tanks according to the first to tenth embodiments of the present invention (see FIGS. 1 to 20), the laser distance measuring instruments 38, 38a, 38b, 38c, 38d, 38e, 38f, If the measurement by 38g and 38h is about once or twice a year, it is possible to record each measurement value in a notebook or the like and perform each displacement manually.
However, as shown below, it is also possible to install each calculation program in the tank monitoring device and automatically calculate the displacement.
The tank monitoring device for automatic calculation will be described below.

As shown in FIG. 23, the tank monitoring device 70 includes a pipe length corrector 71, an inner tank side wall position calculator 72, a center position calculator 73, a radial displacement calculator 74, a vertical member position calculator 75, a center position. It comprises a corrector 76, a rotation direction displacement calculator 77, a memory 78a, a recorder 78b, and a display 79.
The storage device 78a, the recording device 78b, and the display device 79 can be shared with those for various circuits that monitor the discharge pump control device 90, the tank temperature, and the LNG level.

First, the data (or memory area) stored in the storage device 78a will be described.
In the storage device 78a, at least the following common data is input in advance by an input unit (not shown) for measuring the displacement of the double shell structure tank, and stored in a predetermined memory area of the storage device 78a.
1) Inner diameter Dt of inner tank side wall 3
2) Position (coordinates) of the existing center point O of the inner tank side wall 3
3) The center position of the optical axis of each laser beam 39a, 39b, 39c, 39d, 39e, 39f, 39g, 39h of each laser type distance measuring device 38, 38a, 38b, 38c, 38d, 38e, 38f, 38g, 38h (Coordinate)
4) Irradiation directions (irradiation angles) of the respective laser beams 39a, 39b, 39c, 39d, 39e, 39f, and 39g reflected by the mirror body 37.
The common data described above may be set in advance as a constant in a program or the like.
The origin of the coordinates may be the existing center point O of the inner tank side wall 3 or the center point of the outer tank 5.
The above data 1) to 6) are data before the cool-down (when the construction of the double-shell structure tank is completed).

Furthermore, the recorder 78b is provided with a memory area for storing a plurality of sets of the following measurement data.
5) Measurement date 6) Measurement values La, Lb, Lc, Ld of the radial direction displacement measured by the laser type distance measuring instruments 38a, 38b, 38c, 38d, 38e, 38f, 38g, 38h Measured values Le and Lf of the directional displacement, measured value Lg of the existing tank height direction displacement, measured value Lh of the existing pipe length (or measured values Lma, Lmb, Lmc, Lmd of the new radial direction displacement, and the new rotation direction Displacement measurement values Lme, Lmf, new inner tank height displacement measurement value Lmg, new pipe length measurement value Lmh)
7) The calculated radial distances ΔLa, ΔLb, ΔLc, ΔLd from each mirror body 37 to the inner tank side wall 3 and the height direction of the inner tank to the horizontal member 20 for measuring the inner tank height direction displacement Displacement ΔLg and rotation direction distances ΔLme, ΔLmf to vertical member 21 for tank rotation measurement
8) Calculated measured positions (coordinates) Pa, Pb, Pc, Pd, Pe, Pf (or new measured positions (coordinates) Pam, Pbm, Pcm, Pdm, Pem, Pfm)
9) Calculated position (coordinates) of the new center point Om
10) The calculated rotational displacement Δφ
11) Conditions such as temperature in the inner tank side wall 3 at the time of measurement

First, the measured value Lh of the existing pipe length or the measured value Lmh of the new pipe length is measured by the laser type distance measuring device 38h of the pipe contraction correction amount measuring device 29 shown in FIGS.
The measured value Lh of the existing pipe length or the measured value Lmh of the new pipe length is transmitted to the pipe length corrector 71 shown in FIG.

  Alternatively, the pipe temperature is input to the pipe length calculator 88, and the pipe length calculator 88 calculates the measured value Lh of the existing pipe length or the measured value Lmh of the new pipe length and transmits it to the pipe length corrector 71.

On the other hand, in each of the radial distance measuring devices 38a, 38b, 38c, and 38d of the radial displacement measuring devices 26, 26a, 26b, 26c, and 26d shown in FIGS. 1, 2, 3, and 4, FIG. Measured values La, Lb, Lc, Ld of existing radial displacements at the already measured positions Pa, Pb, Pc, Pd shown in FIG. 5 or measured values Lma, Lmb of new radial displacements at the new measured positions Pma, Pmb, Pmc, Pmd. , Lmc, Lmd are measured.
The measured values La, Lb, Lc, and Ld of the measured radial displacement or the measured values Lma, Lmb, Lmc, and Lmd of the new radial displacement are transmitted to the pipe length corrector 71 illustrated in FIG.

In the pipe length corrector 71, the measured values La, Lb, Lc, Ld of the existing radial displacements or the measured values Lma, Lmb, Lmc, Lmd of the new radial displacements are used to determine the measured value Lh of the existing pipe length or the new pipe length. By subtracting the measurement value Lmh, the existing radial direction distances ΔLa, ΔLb, ΔLc, ΔLd or new radial direction distances ΔLma, ΔLmb, ΔLmc, ΔLmd from the first mirror body 37 to the inner tank side wall 3 are calculated. .
The calculated existing radial distances ΔLa, ΔLb, ΔLc, ΔLd or new radial displacement new radial direction distances ΔLma, ΔLmb, ΔLmc, ΔLmd are transmitted to the inner tank side wall position calculator 72.
Further, the measured values La, Lb, Lc, Ld of the measured radial displacement, the measured values Lma, Lmb, Lmc, Lmd of the new radial displacement, the calculated radial distances ΔLa, ΔLb, ΔLc, ΔLd or The new radial direction distances ΔLma, ΔLmb, ΔLmc, and ΔLmd are transmitted to and recorded in the recorder 78b via the direct or inner tank side wall position calculator 72 and the like.

The inner tank side wall position calculator 72 receives from the storage device 78a the center positions (coordinates) of the laser beams 39a, 39b, 39c, and 39d of the laser distance measuring devices 38a, 38b, 38c, and 38d, and the first mirror surface. Data on the irradiation direction (irradiation angle) of each laser beam 39a, 39b, 39c, 39d reflected by the body 37 is input.
Then, in the inner tank side wall position calculator 72, the already measured positions Pa, Pb, and the like in the inner tank side wall 3 irradiated with the respective laser beams 39a, 39b, 39c, 39d by a geometric calculation method based on these various data. Pc, Pd (coordinates) or new measurement positions Pma, Pmb, Pmc, Pmd (coordinates) are calculated.
The calculated already measured positions Pa, Pb, Pc, Pd (coordinates) or new measured positions Pma, Pmb, Pmc, Pmd (coordinates) are transmitted to the center position calculator 73.
The calculated measurement positions Pa, Pb, Pc, Pd (coordinates) or new measurement positions Pma, Pmb, Pmc, Pmd (coordinates) are recorded directly or via a center position calculator 73 described later. The data is also transmitted to the device 78b and recorded.

In the center position calculator 73, the inner tank side wall 3 is obtained by a geometric calculation method based on the received measured positions Pa, Pb, Pc, Pd (coordinates) or new measured positions Pma, Pmb, Pmc, Pmd (coordinates). The existing center position O (coordinates) or the new center position Om (coordinates) is calculated.
The calculated center position O or new center position Om of the inner tank side wall 3 is transmitted to the radial displacement calculator 74.
Further, the calculated center position O or new center position Om of the inner tank side wall 3 is also transmitted to and recorded in the recorder 78b via the direct or radial displacement calculator 74.

When the measurement and calculation processing is the first time (before cool-down), the existing center position O (coordinate) is calculated, transmitted to the recorder 78b, and the process ends when it is stored together with the measurement date.
In the case of measurement and calculation processing for the second time and later, the already measured value, the already measured position, etc. are those of the previous time or the first time, and which measurement date is used as the already measured value, the already measured position, Input by the tank monitoring device 70.

The radial displacement calculator 74 compares the existing center position O (coordinates) transmitted from the storage device 78a with the new center position Om (coordinates) transmitted from the center position calculator 73, and the center position change amount ΔOm. (Direction and displacement) are calculated.
The calculated center position change amount ΔOm is transmitted to the recorder 78b and recorded.
Further, the calculated center position change amount ΔOm is also transmitted to a center position corrector 76 described later.

Further, the pipe length corrector 71 includes laser distance measuring devices 38e and 38f of each rotational direction displacement measuring device 27 shown in FIGS. 1, 2, 3, and 5, and the existing ones shown in FIG. The measured values Le and Lf of the existing rotational direction displacement at the measurement positions Pe and Pf or the measured values Lme and Lmf of the new rotational direction displacement at the new measured positions Pme and Pmf are measured.
The measured values Le and Lf of the measured rotational direction displacement or the measured values Lme and Lmf of the new rotational direction displacement are transmitted to the pipe length corrector 71 shown in FIG.

The pipe length corrector 71 subtracts the measured value Lh of the existing pipe length or the measured value Lmh of the new pipe length from the measured values Le and Lf of the existing rotational direction displacement or the measured values Lme and Lmf of the new rotational direction displacement. The existing rotation direction distances ΔLe and ΔLf or new rotation direction distances ΔLme and ΔLmf, which are distances from the second mirror bodies 37 to the vertical member 21 for measuring the tank rotation, are calculated.
The calculated rotation direction distances ΔLe and ΔLf or new rotation direction distances ΔLme and ΔLmf are transmitted to the vertical member position calculator 75.
The measured values Le and Lf of the measured rotational direction displacement or the measured values Lme and Lmf of the new rotational direction displacement, the calculated rotational direction distances ΔLe and ΔLf, or the new rotational direction distances ΔLme and ΔLmf are directly or vertically Via the member position calculator 75 and the like, it is transmitted to the storage device 78b and recorded.

In the vertical member position calculator 75, the center position (coordinates) of the laser beams 39e and 39f of the laser distance measuring devices 38e and 38f shown in FIG. Data on the irradiation direction (irradiation angle) of the lights 39e and 39f is input.
Then, the vertical member position calculator 75 uses the geometric calculation method based on these various data to perform the apparent rotation shown in FIG. 22 in the vertical member 21 for measuring the tank rotation irradiated with the laser beams 39e and 39f. The measurement positions Pe and Pf (coordinates) or the apparent new measurement positions Pme and Pmf (coordinates) are calculated.

The calculated apparent measured positions Pe and Pf (coordinates) or apparent new measured positions Pme and Pmf (coordinates) are transmitted to the center position corrector 76.
The calculated apparent measured positions Pe and Pf (coordinates) or apparent new measured positions Pme and Pmf (coordinates) are also transmitted to the recorder 78b via the direct or center position corrector 76 and the like. To be recorded.
When the measurement and calculation processing is the first time (before the cool-down), the process ends when the measurement date is stored.

In the center position corrector 76, the apparent measured positions Pe and Pf (coordinates) transmitted from the vertical member position calculator 75 or the apparent new measured positions Pme and Pmf (coordinates) are transmitted from the radial displacement calculator 74. Based on the center position change amount ΔOm, the true existing measurement positions Pe and Pf (coordinates) or the true new measurement positions Pme and Pmf (coordinates) are calculated.
The calculated true existing measurement positions Pe and Pf (coordinates) or the true new measurement positions Pme and Pmf (coordinates) are transmitted to the rotation direction displacement calculator 77.
Also, the calculated true measured positions Pe and Pf (coordinates) or the true new measured positions Pme and Pmf (coordinates) are also transmitted to the recorder 78b directly or via the rotational displacement calculator 77. To be recorded.

In the rotational direction displacement calculator 77, based on the true measured positions Pe and Pf (coordinates) or the true new measured positions Pme and Pmf (coordinates) from the center position corrector 76, the rotational direction displacement amount Δφ (rotational angle). Is calculated.
The calculated rotational direction displacement amount Δφ (rotation angle) is transmitted to and recorded in the recorder 78b.

In the display device 79, the radial displacement, the rotational displacement, and the like of the inner tank side wall 3 are digitally displayed or graphically displayed based on the above various measured values and calculated values.
In addition, while the diameter of the inner tank side wall 3 is 80 m (80000 mm), the amount of radial displacement and the amount of rotational displacement are several hundred mm.
Therefore, when the graphic display is performed with this value, it is difficult to confirm the change by the graphic display.
Therefore, when the amount is graphically displayed, it can be visually confirmed that the radial direction displacement amount and the rotational direction displacement amount are enlarged by, for example, 10 times and displayed graphically.

(Other variations)
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention. Nor.
For example, it can be applied to a pressure-resistant double-shell structure tank for storing pressure fluid other than for storing cryogenic liquefied natural gas (LNG) or the like.
It can also be used in semi-underground double shell tanks.
The liquefied natural gas storage facility is provided with a plurality of storage tanks, vaporized natural gas reliquefaction devices, and the like, but the tank monitoring devices 70 may be provided separately for each tank.
It can also be used in underground double shell tanks.

  Further, when the displacement of the inner tank 1 is not constantly monitored but is measured before the cool-down, after the cool-down, after the occurrence of an earthquake, etc., one or a plurality of laser-type distance measuring devices 38 are provided at the central monitoring center, etc. The shut-off valve 35 of each measurement pipe 33 is closed, a flat plate is attached to the flange at the upper end of each measurement pipe 33, and a laser-type distance measuring device is attached to the upper end of the measurement pipe 33 only at the time of measurement. 38 may be connected and measured.

It is the whole top view of the double shell structure tank concerning a 1st embodiment of the present invention. It is a horizontal sectional view of the double shell structure tank concerning a 1st embodiment of the present invention. It is an AA arrow end view of FIG. It is a detailed side end view of the radial direction displacement measuring apparatus of FIG. FIG. 2 is a detailed side end view of the rotational direction displacement measuring device of FIG. 1. It is a detailed side end view of the height direction displacement measuring apparatus of the inner tank of FIG. FIG. 2 is a detailed side end view of the pipe contraction correction amount measuring apparatus of FIG. 1. It is a detailed side view of the radial direction displacement measuring device or rotational direction displacement measuring device of the double-shell structure tank which concerns on the 2nd Embodiment of this invention. It is a detailed side view of the radial direction displacement measuring apparatus of the double-shell structure tank concerning the 3rd Embodiment of this invention. It is a detailed side view of the radial direction displacement measuring apparatus of the double-shell structure tank concerning the 4th Embodiment of this invention. It is a detailed side view of the radial direction displacement measuring apparatus of the double-shell structure tank concerning the 5th Embodiment of this invention. It is a detailed side view of the radial direction and rotational direction displacement measuring device of the double shell structure tank concerning a 6th embodiment of the present invention. It is a detailed side view of the radial direction displacement and pipe shrinkage | contraction correction amount measuring apparatus of the double shell structure tank concerning the 7th Embodiment of this invention. It is a partial sectional side view of the radial direction displacement measuring apparatus of the double-shell structure tank concerning the 9th Embodiment of this invention. It is the A section enlarged view of FIG. It is a top view of the rotation direction displacement measuring device of the double shell structure tank concerning a 9th embodiment of the present invention. It is a fragmentary sectional side view of the height direction displacement measuring device of the inner tank of the double shell structure tank concerning a 9th embodiment of the present invention. It is the B section enlarged view of FIG. It is a fragmentary sectional side view of the radial direction displacement measuring apparatus of the double shell structure tank concerning a 10th embodiment of the present invention. It is the C section enlarged view of FIG. It is a block diagram of the 1st example of the tank monitoring device in each embodiment of the present invention. It is explanatory drawing which shows the measurement principle of the 2nd example of the tank monitoring apparatus in each embodiment of this invention. It is a block diagram of the tank monitoring apparatus of the 2nd example of the tank monitoring apparatus in each embodiment of this invention. 1 is an overall schematic diagram of a tank facility in which a plurality of double-shell structure tanks according to each embodiment of the present invention are installed. It is a storage tank damage prediction system using a conventional optical fiber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner tank 2 Inner tank bottom plate 3 Inner tank side wall 4 Inner tank upper cover 5 Outer tank 6 Outer tank bottom plate 7 Outer tank side wall 8 Outer tank upper lid 9 Inner tank upper cover hanging metal fitting 10 Tank support member combined heat insulating material 11 Heat insulating material 12 Particulate heat insulation Material 13 Cryogenic liquid 14 Nitrogen gas 15 Cryogenic fluid carry-in / out piping 16 Discharge pump 17 Bell mouth 18 Support 19 Pipe support 20 Horizontal member for measuring displacement in height of inner tank 21 Vertical member for measuring tank rotation 22 Purge discharge Pipe 23 Nitrogen gas supply pipe for purging 24 Nitrogen gas supply pipe 25 Vaporized gas recovery pipe 26, 26a to 26d Radial displacement measuring device 26e Radial and rotational displacement measuring device 26f Radial displacement and pipe contraction correction measuring device 27 27a Rotational direction displacement measuring device 28 Inner tank height direction displacement measuring device 29 Pipe contraction correction amount measuring device 30, 30a-30d Diameter Directional displacement measuring pipe 30e Radial direction / rotational direction displacement measuring pipe 30f Radial direction displacement / pipe contraction correction amount measuring pipe 31a, 31b Rotational direction displacement measuring pipe 32 Inner tank height direction displacement measuring pipe 33 Pipe contraction Correction pipe 34 Displacement measuring device storage box 35 Shut-off valve 36 Mirror surface storage enclosure 37, 37a to 37c, 60 Mirror surface 37d Horizontal member 38, 38a to 38h Laser distance measuring device 39a to 39h Laser light 40 Outlet tube 40
41 Pipe side flange 41 (detachable seat for laser transmitter / receiver)
42 Laser light transmission pressure plate 43 Laser light path changer 44 Mounting bolt nut 45 Displacement measuring device storage box side flange 46 Barrel 47 Movable lid 48 Metal plate 50, 50a Radial displacement measuring device 51 Rotational displacement measuring device 52 Inner tank height Depth measuring device 53 Horizontal member for measuring height displacement of inner tank 54 Vertical member for measuring tank rotation 55a to 55d Pipe for measuring radial displacement 56a, 56b Pipe for measuring rotational displacement 57 Height of inner tank Pipe for direction displacement measurement 58 Displacement measuring instrument storage box 59 Mirror surface storage enclosure 61 Pipe support 62 Outlet pipe 63 Inner tank wall connection bellows 64 Horizontal member support leg 65 Horizontal member for inner tank height direction displacement measurement 66 Horizontal member Connection bellows 67 Inner tank wall side thick pipe 68 Seal rubber 69 Vertical members for tank rotation measurement 70, 70a Device 71 Pipe length corrector 72 Inner tank side wall position calculator 73 Center position calculator 74 Radial direction displacement calculator 75 Vertical member position calculator 76 Center position corrector 77 Rotational direction displacement calculator 78a Storage unit 78b Recorder 79 Display unit 80 Thermometer 81 Machine side indicator 82 Expansion / contraction amount calculator 83 Center position calculator 84 Rotational direction calculator 85 Abnormal value detector 86 Alarm indicator lamp 87 Indicator / recorder 88 Pipe length calculator 88
91 Tank equipment 91
90 Discharge pump control device 90
Pa to Ph Existing measurement position Pma to Pmh New measurement position Pa to Ph Existing measurement position Pma to Pmh New measurement position La to Ld Measurement value of existing radial direction displacement Lma to Lmd Measurement value of new radial direction displacement ΔLa to ΔLd Existing diameter direction Distance ΔLma to ΔLmd New radial direction distance Le, Lf Measured value of previous rotational direction displacement Lme, Lmf Measured value of new rotational direction displacement ΔLe, ΔLf Existing rotational direction distance ΔLme, ΔLmf New rotational direction distance Lg Height direction of existing tank Measured value of displacement Lmg Measured value of displacement in height direction of new inner tank ΔLg Measured value of displacement in height direction of inner tank Lh Measured value of existing pipe length Lmh Measured value of new pipe length

Claims (24)

In a double-shell structure tank having an outer tank and an inner tank,
A pipe for measuring radial displacement passing through the upper part of the outer tank and the upper cover of the inner tank, and supported by the outer tank ,
A shutoff valve provided outside the outer tank of the radial displacement measuring pipe;
A detachable seat for a laser transmitter / receiver provided at the upper end of the radial displacement measuring pipe;
A double-shell structure tank device. A mirror body that is attached to the lower end of the radial displacement measuring pipe and reflects laser light emitted from a laser-type distance measuring device connected to the laser transmitter / receiver seat, in the direction of the inner tank,
The double-shell structure tank apparatus according to claim 1, comprising: The inner tank has an inner tank bottom plate and an inner tank side wall, and an inner tank upper lid provided to be movable relative to the inner tank side wall,
The double-shell structure tank apparatus according to claim 2, wherein the radial displacement measuring pipe extends in a vertical direction and penetrates the inner tank upper lid.   The double-shell structure tank apparatus according to claim 3, wherein the radial displacement measuring pipe and the mirror body are made of the same material. Two pipes for measuring the radial displacement facing the inner tank are provided,
5. The mirror according to claim 3, wherein the mirror body is installed so that an irradiation direction of the laser light reflected by the mirror body opens within a range of 90 ° ± 20% in a horizontal plane. Heavy shell tank device. At least three radial displacement measuring pipes facing the inner tank are provided,
5. The double-shell structure tank apparatus according to claim 3, wherein the mirror body is installed so that an irradiation direction of the laser beam reflected by the mirror body opens at an equal angle in a horizontal plane. The radial displacement measuring pipe facing the inner tank is one,
The specular body has a polygonal pyramid shape,
5. The double-shell structure tank device according to claim 3, wherein the laser beam is irradiated to a plurality of locations. The radial displacement measuring pipe facing the inner tank is one,
The specular body has a polygonal pyramid shape,
The double-shell structure tank apparatus according to claim 3 or 4, wherein an irradiation direction of the laser beam is changeable. A vertical member attached to the inner tank side wall;
A rotational displacement measuring pipe extending in the vertical direction and penetrating the upper part of the outer tank and the upper cover of the inner tank and facing the vertical member;
A shutoff valve provided outside the outer tub of the rotational direction displacement measuring pipe;
A detachable seat for a laser transmitter / receiver provided at an upper end of the rotational direction displacement measuring pipe;
A second mirror body that is attached to a lower end of the rotational direction displacement measuring pipe and reflects laser light emitted from a laser-type distance measuring device connected to the laser transmitter / receiver seat to the vertical member;
The double-shell structure tank device according to any one of claims 3 to 8, wherein   The double-shell structure tank apparatus according to claim 9, wherein the rotational displacement measuring pipe and the second mirror body are made of the same material. A horizontal member attached to the inner tank side wall;
A pipe for measuring the displacement in the height direction of the inner tub extending vertically and penetrating the upper portion of the outer tub and the upper lid of the inner tub and facing the horizontal member;
A shutoff valve provided outside the outer tank of the pipe for measuring displacement in the height direction of the inner tank;
A laser transmitter / receiver mounting / dismounting seat provided at the upper end of the height direction displacement measuring pipe of the inner tank,
The double-shell structure tank apparatus according to any one of claims 3 to 10, further comprising: A pipe contraction correcting pipe extending in the vertical direction and penetrating through the upper part of the outer tank and the upper cover of the inner tank,
A shutoff valve provided outside the outer tub of the pipe contraction correction pipe;
A detachable seat for a laser transmitter / receiver provided at an upper end of the pipe contraction correction pipe;
A horizontal pipe lower end horizontal member attached to the lower end of the pipe contraction correction pipe;
The double-shell structure tank apparatus according to any one of claims 3 to 11, further comprising:   The double-shell structure tank apparatus according to any one of claims 3 to 8, wherein a temperature sensor is provided at a predetermined interval on the pipe for measuring the radial displacement or the pipe penetrating the inner tank upper lid.   The double-shell structure tank apparatus according to claim 9 or 10, wherein a temperature sensor is provided at a predetermined interval on the pipe for measuring displacement in the rotational direction.   The double-shell structure tank apparatus according to claim 11, wherein temperature sensors are provided at predetermined intervals on the pipe for measuring displacement in the height direction of the inner tank.   The double-shell structure tank device according to claim 2, wherein the radial displacement measuring pipe extends in a vertical direction and extends between the inner tank and the outer tank. At least three radial displacement measuring pipes facing the inner tank are provided,
The double-shell structure tank apparatus according to claim 16, wherein the mirror body is installed so that an irradiation direction of the laser beam reflected by the mirror body opens at an equal angle in a horizontal plane. A vertical member attached to the inner tank side wall;
A rotational displacement measuring pipe extending in the vertical direction and extending between the inner tank and the outer tank;
A shutoff valve provided outside the outer tub of the rotational direction displacement measuring pipe;
A detachable seat for a laser transmitter / receiver provided at an upper end of the rotational direction displacement measuring pipe;
A second mirror body that is attached to a lower end of the rotational direction displacement measuring pipe and reflects laser light emitted from a laser-type distance measuring device connected to the laser transmitter / receiver seat to the vertical member;
The double-shell structure tank apparatus according to claim 16 or 17, further comprising: A horizontal member attached to the inner tank side wall;
A pipe for measuring the displacement in the height direction of the inner tub extending in the vertical direction and facing the horizontal member;
A shutoff valve provided outside the outer tank of the pipe for measuring displacement in the height direction of the inner tank;
A laser transmitter / receiver mounting / dismounting seat provided at the upper end of the height direction displacement measuring pipe of the inner tank,
The double-shell structure tank apparatus according to any one of claims 16 to 18, further comprising:   The double-shell structure tank device according to any one of claims 1 to 19, wherein a laser type distance measuring device is connected to each of the laser transmitter / receiver seats. A tank monitoring device that calculates and displays radial displacement and rotational displacement in the double-shell structure tank device;
The tank monitoring device
The measured value of the radial displacement measured by the laser distance measuring instrument connected to the radial displacement measuring pipe and the measured value of the laser distance measuring instrument connected to the rotational displacement measuring pipe. The radial distance and the rotational distance are calculated by subtracting the measured pipe length measured by the laser distance measuring instrument connected to the pipe contraction correction pipe from the measured rotational displacement. A pipe length corrector;
An inner tank side wall position calculator for calculating the position of the inner tank side wall from the radial distance from the pipe length corrector;
A center position calculator for calculating the center position of the inner tank side wall based on the position of the inner tank side wall from the inner tank side wall position calculator;
A radial displacement calculator that calculates a displacement amount of the center position of the inner tank side wall based on the center position from the center position calculator;
A vertical member position calculator for calculating the position of the vertical member based on the rotational direction distance from the pipe length corrector;
A center position corrector that calculates the true position of the vertical member based on the position of the vertical member from the vertical member position calculator;
A rotation direction displacement calculator for calculating a rotation angle of the inner tank side wall based on the position of the true vertical member from the center position corrector;
A display for displaying the amount of displacement of the center position from the radial displacement calculator and the rotation angle from the rotational displacement calculator;
The double-shell structure tank apparatus according to any one of claims 9 to 13, 18, and 19, further comprising: In a double-shell structure tank having an outer tank and an inner tank,
Four radial displacement measuring pipes that penetrate the upper part of the outer tub and are attached at equal intervals;
A shut-off valve provided outside the outer tub of each radial displacement measuring pipe;
A laser transceiver mounting / removing seat provided at the upper end of each radial displacement measuring pipe,
A mirror body that is attached to the lower end of each radial displacement measuring pipe and reflects each laser beam emitted from each laser type distance measuring device connected to each laser transmitter / receiver seat to the inner tank. When,
Two vertical members attached to the inner tank side wall with respect to the center of the inner tank,
A rotational displacement measuring pipe that extends in the vertical direction and penetrates the upper part of the outer tank and the upper cover of the inner tank and faces each of the vertical members;
A shut-off valve provided outside the outer tub of each rotational direction displacement measuring pipe;
Removable seat for laser transmitter / receiver provided at the upper end of each rotational direction displacement measuring pipe,
Reflecting each laser beam emitted from each laser type distance measuring device attached to the lower end of each rotational direction displacement measuring pipe and connected to each laser transmitter / receiver seat in the direction of each vertical member. Two mirror bodies,
A pipe contraction correction pipe extending vertically and penetrating through the upper part of the outer tub, a shutoff valve provided outside the outer tub of the pipe contraction correction pipe, and provided at an upper end of the pipe contraction correction pipe A horizontal member at the lower end of the horizontal pipe attached to the detachable seat for the laser transceiver and the lower end of the pipe contraction correction pipe;
A tank monitoring device that calculates and displays radial displacement and rotational displacement in the double-shell structure tank device;
The tank monitoring device
A center position calculator for calculating the center position of the inner tank side wall from the measured value of the radial displacement measured by the laser type distance measuring instrument connected to the radial displacement measuring pipe;
Measured by the laser distance measuring instrument connected to the pipe contraction correction pipe from the measured value of the rotational displacement measured by the laser distance measuring instrument connected to the rotational displacement measuring pipe. A pipe length corrector that subtracts the measured pipe length and calculates the rotational distance.
A rotation direction calculator for calculating a rotation angle of the inner tank side wall based on the rotation direction distance from the pipe length corrector and the center position calculated by the center position calculator;
A double-shell structure tank apparatus comprising a display for displaying these measured values and calculated values. In a double-shell structure tank having an outer tank and an inner tank,
Four radial displacement measuring pipes that penetrate the upper part of the outer tub and are attached at equal intervals;
A shut-off valve provided outside the outer tub of each radial displacement measuring pipe;
A laser transceiver mounting / removing seat provided at the upper end of each radial displacement measuring pipe,
A mirror body that is attached to the lower end of each radial displacement measuring pipe and reflects each laser beam emitted from each laser type distance measuring device connected to each laser transmitter / receiver seat to the inner tank. When,
Two vertical members attached to the inner tank side wall with respect to the center of the inner tank,
A rotational displacement measuring pipe that extends in the vertical direction and penetrates the upper part of the outer tank and the upper cover of the inner tank and faces each of the vertical members;
A shut-off valve provided outside the outer tub of each rotational direction displacement measuring pipe;
Removable seat for laser transmitter / receiver provided at the upper end of each rotational direction displacement measuring pipe,
Reflecting each laser beam emitted from each laser type distance measuring device attached to the lower end of each rotational direction displacement measuring pipe and connected to each laser transmitter / receiver seat in the direction of each vertical member. Two mirror bodies,
A temperature sensor attached to any of the measurement pipes;
A tank monitoring device that calculates and displays radial displacement and rotational displacement in the double-shell structure tank device;
The tank monitoring device
A center position calculator for calculating the center position of the inner tank side wall from the measured value of the radial displacement measured by the laser type distance measuring instrument connected to the radial displacement measuring pipe;
From the measured value of the rotational displacement measured by the laser-type distance measuring instrument connected to the rotational displacement measuring pipe, the measured value of the pipe length calculated based on the temperature measured by the temperature sensor is obtained. A pipe length corrector that subtracts and calculates the rotational distance;
A rotation direction calculator for calculating a rotation angle of the inner tank side wall based on the rotation direction distance from the pipe length corrector and the center position calculated by the center position calculator;
A double-shell structure tank apparatus comprising a display for displaying these measured values and calculated values. The double-shell structure tank device according to any one of claims 21 to 23,
A plurality of the double shell structure tanks are installed,
Each tank monitoring device is provided in a central monitoring center.

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