JP4081835B2 - Installation method of sheath type resistance thermometer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an installation method for a sheath type resistance temperature detector.
[0002]
[Prior art]
As shown in FIG. 4, in a low-temperature tank 1 for storing a low-temperature liquefied gas such as LNG as a storage liquid, a sheath is suspended from the vicinity of the top of the tank roof 2 and detects the temperature of the storage liquid at a plurality of heights. A type resistance thermometer 3 is provided so that the temperature of each layer of the stock solution can be monitored.
[0003]
Here, the sheath type resistance temperature detector 3 is a temperature sensor using a resistance element whose electric resistance varies with temperature, and is formed by providing the resistance element and wiring in a stainless steel thin tube. 1, a plurality of sheathed resistance thermometers 3 having different temperature detection positions are suspended from the tank roof 2.
[0004]
Conventionally, when installing this type of sheathed resistance thermometer 3, as shown in FIG. 5, a lifting device 4 or a transport device installed in advance on the tank roof 2 for maintenance and inspection work such as a pump and a safety valve. 5 is used to transport the sheath-type resistance thermometer 3 wound in the shape of a spider from the ground to the top of the dome-shaped tank roof 2, and then, as shown in FIG. The distal end portion (lower end portion when suspended) is inserted into the low temperature tank 1 little by little through the installation nozzle 7 by manual work by a plurality of workers 6, and the sheath type resistance temperature detector inserted into the low temperature tank 1 When the suspension length of the body 3 increases and it becomes difficult for the worker 6 to hold the sheathed resistance thermometer 3, the appropriate position of the sheathed resistance thermometer 3 is secured from the ground side by a crane (not shown). And in a suspended state In order to prevent the sheath-type resistance thermometer 3 from being inadvertently dropped to the tank bottom 8 (see FIG. 4), the insertion operation is continued while being secured by the crane, and the secured position by the crane is the installation nozzle 7 As shown in FIG. 7, the base end portion on the suspension side of the sheathed resistance temperature detector 3 (upper end portion when suspended) is finally The crane is lifted directly above the installation nozzle 7 through the installation flange member 9 provided at the base end, and the installation flange member 9 is suspended from the upper end of the installation nozzle 7 and fixed by bolt fastening or the like. I was doing.
[0005]
[Problems to be solved by the invention]
However, in such a conventional construction method, the working radius is increased because the boom of the crane must be extended from the ground side to the top of the tank roof 2 to secure the sheathed resistance temperature detector 3 and to perform final fixing work. The large 100-ton class large crane must be used, which causes a significant increase in construction costs.
[0006]
In recent years, the cryogenic tank 1 has a tendency to increase in size. In particular, the underground cryogenic tank 1 as shown in FIG. The length of the temperature resistor 3 is also required to be long, and the weight of the sheath-type resistance thermometer 3 that must be held by the tank roof 2 during installation increases, so that manual operation by the worker 6 is sufficient. It is becoming impossible to deal with.
[0007]
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to make it possible to install a sheath type resistance temperature detector very easily and inexpensively without requiring a large crane.
[0008]
[Means for Solving the Problems]
The present invention is an installation method of a sheath type resistance temperature detector that is suspended from a tank roof in a low temperature tank and detects the temperature of the stored liquid at a plurality of heights. After the sheath type resistance temperature detector is carried into the bottom of the tank, a winch is installed on the outside of the tank roof, and the wire unwound from the winch is suspended to the bottom of the tank through a tank roof installation nozzle. A suspension-side base end portion of the resistance temperature detector is attached to the lower end of the wire via an installation flange member provided at the base end portion, and the wire is wound up by the winch so that the sheath type is formed from the outside of the tank roof. fried hanging base end portion of the resistance temperature detector, characterized in that it suspended by fixing the mounting nozzle and mounting flange member having a base end portion of the sheath RTD having reached the tank roof Nodea Ru.
[0009]
In this way, the base end of the sheathed RTD at the bottom of the tank is suspended from the winch installed on the tank roof to the tank roof just by winding the wire suspended in the cryogenic tank through the installation nozzle. Since it can be lifted and suspended, it is not necessary to extend the boom of a large crane from the ground side to the top of the tank roof to secure a sheathed resistance temperature detector or to perform final fixing work as in the conventional method. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
1 to 3 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as in FIGS. 4 to 7 represent the same items.
[0012]
In the installation method of the sheath type resistance temperature detector 3 of the present embodiment, the sheath type resistance temperature detector 3 is suspended from the installation nozzle 7 of the tank roof 2 and installed in the low temperature tank 1 as in the conventional method. It is characterized by the point that the sheathed resistance thermometer 3 previously carried into the tank bottom 8 in the low temperature tank 1 is lifted and installed to the tank roof 2 and the specific work procedure is as follows. Is as detailed below.
[0013]
That is, as shown in FIG. 1, a sheath type resistance temperature detector 3 which is opened in a manhole 10 provided in a relatively outer position of the tank roof 2 of the low temperature tank 1 and wound in a circular shape is relatively small. The crane 11 is hung down to the tank bottom 8 through the manhole 10 so that the sheath-type resistance thermometer 3 wound in the shape of a spider is not entangled at the tank bottom 8 where a relatively wide working space is easily secured. Extend as long as possible to make the next lifting work easier.
[0014]
Thereafter, as shown in FIG. 2, a winch 12 is installed near the top of the tank roof 2, and a work rod 14 that supports the sheave 13 is installed immediately above the installation nozzle 7. The unwound wire 15 is wound around the sheave 13 of the working rod 14 and then hung down to the tank bottom 8 through the installation nozzle 7, and the base end of the sheathed resistance temperature detector 3 on the suspension side (suspended) Is attached to the lower end of the wire 15 via an installation flange member 9 provided at the base end portion, and the wire 15 is wound up by the winch 12 so that the sheath-type resistance thermometer 3 is The base end portion is lifted, and the installation flange member 9 provided at the base end portion of the sheath type resistance temperature detector 3 reaching the tank roof 2 is fixed to the installation nozzle 7 and suspended.
[0015]
Here, when fixing the installation flange member 9 of the sheath type resistance temperature detector 3 to the installation nozzle 7, for example, as shown in FIG. 3, the outer diameter of the installation flange member 9 is set to the inner diameter of the installation nozzle 7. The attachment nozzle 16 is disposed on the installation nozzle 7 and the flange 17 at the lower end of the attachment nozzle 16 and the flange 18 at the upper end of the installation nozzle 7 are bolted through a packing 19. The outer peripheral portion of the flange member 9 for installation of the sheathed resistance temperature detector 3 is applied from below to the ring-shaped bracket 20 provided on the inner peripheral surface of the flange 17 at the lower end of the attached nozzle 16, and is bolted through the packing 21. With regard to the bolt fastening, for example, an appropriate number of stud bolts are disposed upward on the outer periphery of the flange member 9 for installation of the sheath type resistance temperature detector 3. Equipped advance, it suffices to fix a nut through a respective stud bolt into the bolt hole of the bracket 20.
[0016]
The operation from the lifting of the base end portion of the sheath-type resistance thermometer 3 to the fixing is performed with the upper end of the attached nozzle 16 open, and the installation of the sheath-type resistance thermometer 3 is completed. After that, the lid 22 is put on the upper end of the attached nozzle 16, and the outer peripheral portion of the lid 22 and the flange 23 at the upper end of the attached nozzle 16 are bolted through the packing 24.
[0017]
Further, the wiring 3a led from the base end portion of the sheath type resistance temperature detector 3 is electrically connected to the cable 27 mounted on the guide tube 25 protruding from the side portion of the attached nozzle 16 via the connector 26. To be connected.
[0018]
Thus, if such a work procedure is adopted, the sheath-type measurement of the tank bottom 8 can be performed simply by winding the wire 15 suspended from the winch 12 on the tank roof 2 through the installation nozzle 7 into the low-temperature tank 1. Since the base end of the temperature resistor 3 can be hung up to the tank roof 2 and suspended, the boom of a large crane is extended from the ground side to the top of the tank roof 2 as in the conventional construction method. There is no need to secure the resistor 3 or perform final fixing work.
[0019]
Therefore, according to the above embodiment, the sheath type resistance temperature detector 3 can be installed very easily and at low cost without using a large crane.
[0020]
In addition, the installation method of the sheath type resistance temperature detector of the present invention is not limited to the above-described embodiment, and can be applied to a ground-type low temperature tank. Of course, the construction opening may be opened and the sheathed resistance temperature detector may be carried into the bottom of the tank, and various modifications can be made without departing from the scope of the present invention.
[0021]
【The invention's effect】
According to the installation method of the sheath type resistance temperature detector of the present invention described above, the sheath type resistance temperature detector at the bottom of the tank can be obtained simply by winding the wire suspended in the low temperature tank from the winch on the tank roof through the installation nozzle. Since the base end of the body can be hung up to the tank roof and suspended, the sheath type resistance thermometer can be installed very easily and inexpensively without using a large crane. Can have an effect.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a state in which a sheath type resistance temperature detector is carried into a tank bottom.
FIG. 2 is a schematic view showing a state in which a sheath type resistance temperature detector is lifted by a winch.
FIG. 3 is a schematic view showing an example of a structure for fixing a sheath type resistance temperature detector.
FIG. 4 is a cross-sectional view showing an example of a low-temperature tank provided with a sheath type resistance temperature detector.
FIG. 5 is a schematic view showing a state in which a sheathed resistance temperature detector is being transported to a tank roof.
FIG. 6 is a schematic view showing a state in which a sheath type resistance temperature detector is inserted into a low temperature tank.
FIG. 7 is a schematic view showing a state where a sheath type resistance temperature detector is lifted by a crane.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Low temperature tank 2 Tank roof 3 Sheath type resistance temperature detector 7 Nozzle for installation 8 Tank bottom part 9 Flange member for installation 12 Winch 15 Wire

Claims (1)

This is a sheath type resistance thermometer that is suspended from a tank roof in a low temperature tank and detects the temperature of the stored liquid at multiple points in the height direction. After carrying the temperature resistor to the bottom of the tank, a winch is installed on the outside of the tank roof, and the wire unwound from the winch is suspended to the bottom of the tank through a tank roof installation nozzle, and a sheath type resistance temperature detector Is attached to the lower end of the wire via a mounting flange member provided at the base end, and the wire is wound up by the winch so that the sheath-type resistance thermometer from the outside of the tank roof. measuring the fried hanging proximal end, sheath, characterized in that suspended by fixing the mounting nozzle and mounting flange member having a base end portion of the sheath RTD having reached the tank roof Installation construction method of the resistor.

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