JP3666914B2 - Oil tank sealing device - Google Patents

Description

[0001]
The present invention relates to an oil tank sealing TomeSo location relates to oil vessel sealing TomeSo location that can be sealed in a short period of time the opening of the oil tank opened by particular accident.
[0002]
[Prior art]
In modern life, petroleum plays an important role as an energy resource and as a raw material for the chemical industry. For this oil transportation, a ship called a tanker, a car called a tank truck, a railway vehicle equipped with an oil tank, and the like are used. Unfortunately, in the transportation of oil by these transportation means, an oil tank may be damaged due to an accident, and oil may spill around and pollute the environment.
[0003]
Conventionally, for example, an oil fence has been installed on the water or a dam has been constructed on the ground in order to prevent the spilled oil from expanding the area in which environmental pollution is caused.
[0004]
Also, in order to prevent residual damage in the oil spilled area, the spilled oil can be scooped up, absorbed into a mat called an oil mat, or solidified with an oil coagulant and recovered. Yes.
[0005]
[Problems to be solved by the invention]
However, preventing the expansion of the damaged area with an oil fence or preventing the remaining damage by collecting oil does not prevent the oil spill itself from a damaged oil tank. In addition to being lost, it will increase the effort and time to prevent the expansion of the damaged area and to prevent the residual damage.
[0006]
The present invention, which has been completed to solve the above technical problems, and an object thereof is to provide a oil bath seal TomeSo location that can be sealed in a short period of time the opening of the oil tank is opened by accident .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the oil tank sealing device of the present invention is inserted into the oil tank from the opening opened in the oil tank wall, and then inflated larger than the opening in the oil tank, and the back of the bag. For inserting the bag into the oil tank, a fluid supply means for supplying fluid into the bag, and a bag fixing means for fixing the bag to the wall of the oil tank. The fixing means is fixed to the main body portion, which is fixed to the opening on the outer wall surface of the oil tank in close contact with the entire outer periphery, fixing means for fixing the main body portion to the outer wall surface of the oil tank, and the main body portion. And a bag insertion part provided with slits at appropriate intervals in the circumferential direction of the outer end part , and a bag fixing part for fixing the bag and sheath inserted through the bag insertion part to the bag insertion part. the bag fixing portion, a fitting with its fastening, tightening and fitted in the slit portion of the bag insertion portion The bag insertion portion is characterized in that securing by crimping the bag and sheath.
[0010]
The present invention will be described in further detail as follows.
First, in the present invention, an oil tank is an oil tank that is mounted and moved mainly on a ship, a vehicle, etc., but an oil tank fixed on the ground is also included in the scope of application of the present invention.
[0011]
In addition, the oil tank wall includes a double wall or multiple wall structure in order to prevent the oil from flowing out due to an accident. There may be.
[0012]
The bag used in the present invention may be a bag that can be shrunk or inflated, and is not limited to a bag having a shrinkable shell wall. The volume is reduced by folding the shell wall, and the volume is increased by expanding. It may be an increasing bag.
[0013]
The material of the bag is not particularly limited, but is required to be strong enough to withstand the pressure of the fluid filled therein, and not to be cut by a sharp break edge formed by breakage.
[0014]
As a method of preventing cutting due to sharp broken edges formed by destruction, the shell wall of the bag is made thicker than the expected depth of the cut, or the surface hardness of the bag is increased to make it difficult to cause the cutting itself. It is conceivable that the shell wall of the bag is made of a contractible film body so that the rim of the cutting port is in close contact with the oil tank wall.
[0015]
Among these methods, the method of thickening the shell wall of the bag makes it difficult to fold the bag, requires a large storage space, is difficult to handle, increases the amount of material, and is disadvantageous for cost reduction. Become.
[0016]
In addition, the method of increasing the surface hardness of the bag increases the surface processing cost of the bag, which is disadvantageous in terms of cost reduction and is difficult to handle.
[0017]
The method of forming the shell wall of the bag with a shrinkable film body can make the shell wall of the bag relatively thin, lowering material costs and processing costs, reducing storage space, and facilitating handling. So it is most recommended among the above methods.
[0019]
A bag used in the onset light is capable of providing a valve for opening and closing the mouth, by closing the mouth of the bag by the valve, you can decouple the fluid supply means for filling the fluid from the outside of the bag become.
[0020]
The bag used in the present invention may be a sealed bag when the fluid supply means is stored in the bag in advance.
[0021]
In this onset bright, it is inserted from an opening opened by accident oil bath in a state of being contracted the bag.
[0022]
Here, the state in which the bag is contracted is a state in which the bag is small in the direction of the opening surface of the opening, and when the shell wall of the bag is contracted, the shell wall of the bag is folded. And a state in which the shell wall of the bag is contracted and folded.
[0023]
But the bag should just be shrink | contracted to the opening surface direction of an opening part, and does not need to be shrunk | reduced to the depth direction. For example, as a result of folding the bag, the depth may be greater than when the bag is inflated.
[0024]
Also, the insertion of the bag into the oil tank means that the portion of the bag having the largest dimensional difference between the expansion and contraction is inserted into the oil tank at the position of the oil tank wall or the oil tank wall. The whole may not be inserted into the oil tank.
[0025]
However, it is advantageous to make the expansion of the bag in the oil tank sufficiently large so that the mouth side portion of the expanded bag is in close contact with the inner surface of the wall of the oil tank. For this purpose, the bag is inserted into the oil tank to the vicinity of the mouth. Is preferred.
[0026]
Oite this onset bright protects the bag upon insertion of the bag, to insert to a sufficiently oil vessel deep inner portion of the bag, it can be used a portion or sheath that covers the whole of the contracted bag is there. This sheath may be removed from the oil tank after the bag is inserted and before the bag is inflated, but in order to simplify the work as much as possible and to reduce the labor as much as possible, the sheath is divided in the circumferential direction and the sheath is expanded according to the expansion of the bag. May be opened.
[0027]
Further, Oite this onset bright, for insertion to a sufficiently oil vessel deep inner portion of the bag upon insertion of the bag, it is possible to insert the shape-retaining member in contracted the bag. The shape retainer may be removed from the bag before the bag is inflated or may remain in the bag when the bag is inflated.
[0028]
The fluid filled in the bag after inserting the bag into the oil tank is not particularly limited, but in order to shorten the filling time, it is preferable to use a fluid having low viscosity, for example, water, oil, It is preferable to use gas or the like.
[0029]
Among these low-viscosity fluids, it is more preferable to use a gas having the lowest viscosity, and examples of the gas include engine exhaust, air, nitrogen gas, and carbon dioxide gas. Among these gases, it is recommended to use an inert gas such as nitrogen gas or carbon dioxide gas that does not cause fire. In particular, since carbon dioxide gas is liquefied at a relatively high temperature, it is advantageous because a large amount of gas can be transported at low cost by liquefaction.
[0030]
Incidentally, Oite the present onset bright, minimizing the volume that the fluid supply means is a vessel contracted compressed gas or liquefied gas, since handleability becomes good preferred.
[0031]
In order to fill the bag with fluid, a fluid supply means for supplying the fluid is required. As the fluid supply means, a necessary amount from the surroundings such as an engine, a compressor, and a pump mounted on a ship, a vehicle, etc. The one that collects and discharges fluid and the container (cylinder) containing a predetermined amount of pressurized fluid or liquefied product thereof are considered, and the former is advantageous in that the amount of fluid to be supplied is not limited, The latter is advantageous in that it can be used even where fluid cannot be easily collected from the surroundings.
[0032]
The fluid supply means may be stored in the bag in advance, inserted into the bag at the time of use, connected to the bag from the outside at the time of use, or always connected to the bag.
[0035]
Here, in order to fix this body portion in a stable good oil tank, it is preferable to fasten the contact form the main body portion on the outer wall surface of the oil tank.
[0036]
In this case, in order to more reliably prevent oil leakage from the opening of the oil tank, it is preferable to give the main body part flexibility so that the main body part can be deformed following the outer wall surface of the oil tank.
And this main-body part is formed in the magnitude | size which covers the opening part of an oil tank.
[0037]
The fastening means is not particularly limited, but the wall of the oil tank is often composed of a magnetic plate such as iron or steel, and there is no risk of fire during fastening work, It is recommended to use a magnet that does not require drilling or bolt welding in the oil tank for fastening.
[0038]
In order to facilitate the installation work of the main body to the oil tank, this magnet is supported by the main body with a plurality of magnets at appropriate intervals, and the main body is positioned at a plurality of positions with appropriate intervals on the outer wall surface of the oil tank. It is preferable to fasten with.
[0039]
Furthermore, as a magnet, although it does not prevent using a permanent magnet, in order to make the attachment operation | work to the oil tank of a main-body part easy, it is still more preferable to use the electromagnet which can turn on and off magnetic force as needed.
[0040]
The method of fixing the bag insertion part to the main body part is not particularly limited. For example, the two parts are integrally formed, the two parts formed separately are joined together in an inseparable manner by bonding, welding, fusion, fitting, etc. Or can be connected so as to be separable by fitting, screwing, pinning or the like.
[0041]
In the present invention, the bag fixing portion for fixing the bag to the bag insertion portion, one of the outer condensation type tightening the bag insertion portion inserted through the bag inside thereof is employed.
[0042]
By the way, in the present invention, for example, when applied to a ship such as a tanker, after inserting a shrunk bag into the oil tank from an opening opened in the wall of the oil tank, the bag is filled with fluid and larger than the opening. When inflated, a balloon-shaped stopper is formed in the oil tank that closes the opening, and the balloon-shaped stopper is pressed against the wall of the tank by the pressure of the oil and is in close contact with the wall. On the outside of the wall, the bag fixing means is pressed by seawater or the like, and as a result, the sealing degree is further improved.
[0044]
【Example】
It will be specifically described below on the basis of the oil vessel sealing TomeSo location according to an embodiment of the present invention with reference to the drawings.
[0045]
This embodiment can also be applied to an oil tank fixed on the ground, but here it is mounted on a transportation system such as a ship or a vehicle where the oil tank is more likely to be damaged by an accident than the oil tank fixedly installed on the ground. A case where the oil tank is applied to an oil tank of a tanker having a particularly large capacity will be described as an example.
[0046]
As shown in FIG. 1, the opening 4 opened by an accident in the string outer plate 3 of the hull 2 that covers the side surface of the oil tank 1 is sealed using the oil tank sealing device 5 in the following procedure.
[0047]
First, the bag 6 of the oil tank sealing device 5 is fixed to the wall of the oil tank 1 by a bag fixing means 11 described later, and then inserted into the opening 4 in a contracted state. The bag 6 only needs to be a bag 6 that can be shrunk or inflated, and the shell wall forming the bag 6 is not limited to a bag having shrinkability, and the volume is reduced and expanded by folding the shell wall. It may be a bag whose volume is increased by the above.
[0048]
Here, in order to enlarge the volume change of the bag 6, the volume is reduced by folding the shell wall, the volume is increased by expanding the shell wall, and the shell wall is shrinkable.
[0049]
The material of the bag 6 is not particularly limited, but is required to be strong enough to withstand the pressure of the fluid filled therein, and not to be cut by a sharp break edge formed by breakage. .
[0050]
As a method for preventing the cutting due to the sharp fracture edge formed by the fracture, a method in which the shell wall of the bag 6 is made thicker than the expected depth of the cut flaw, and the surface hardness of the bag 6 is increased to make it difficult to cause the cutting itself. In this case, the bag 6 can be easily handled, such as folding the bag 6, and the storage space can be reduced. In addition, the material is reduced in thickness and the surface treatment is expensive. In order to reduce costs by reducing the cost, it is advantageous to employ a method in which the shell wall of the bag 6 is formed of a shrinkable film body.
[0051]
From such a viewpoint, in this embodiment, vinyl containing a wire reinforcing core is used as the material of the bag 6.
[0052]
In addition, the bag 6 is provided with a self-sealing valve 7 that opens and closes the mouth. By closing the mouth of the bag 6 by the valve 7, the fluid filled in the bag 6 is sealed in the bag 6, The fluid supply means 8 for filling the fluid from the outside of the bag 6 can be separated.
[0053]
The structure of the valve 7 is not particularly limited. Here, as shown in FIG. 2, the valve 7 is configured by a funnel-like flexible film body that narrows toward the inside of the bag 6 provided inside the mouth portion of the bag 6. Yes.
[0054]
Here, the state in which the bag 6 is contracted is a state in which the bag 6 is small in the direction of the opening surface of the opening 4, and here, the shell wall of the bag 6 contracted by elastic force is folded. Thus, the bag 6 is in a contracted state.
[0055]
The folding method of the bag 6 is not particularly limited. For example, as shown in FIG. 3, the front end portion 6a of the bag 6 is folded like a umbrella into a fold shape having a large folding depth at the peripheral edge, and the folding depth of the trunk portion 6b. Folded into almost the same pleat shape, folded from the body part to the mouth side part into the same pleat form as the tip part, and when inflated, the tip from the mouth side part is almost cylindrical as shown by the phantom line in the figure To spread.
[0056]
But the bag 6 should just be shrink | contracted in the opening surface direction of the opening part 4, and does not need to be shrink | contracted in the depth direction. Here, as a result of folding the bag 6, the depth becomes larger than when the bag 6 is inflated.
[0057]
Also, when the bag 6 is inserted into the oil tank 1, the portion of the bag 6 having the largest dimensional difference between the expansion and contraction is located at the position of the string outer plate 3 of the oil tank 1 or the string outer plate 3 of the oil tank 1. What is necessary is just to be inserted in the oil tank 1, and the whole bag 6 does not need to be inserted in the oil tank 1.
[0058]
However, in order to inflate the bag 6 in the oil tank 1 and seal the opening 4, it is advantageous to bring the mouth side portion of the inflated bag 6 into close contact with the inner surface of the string outer plate 3. The bag 6 is inserted into the oil tank 1 up to the vicinity of its mouth.
[0059]
Furthermore, in this embodiment, the sheath 6 covers a part (or all) of the contracted bag 6 in order to protect the bag 6 when the bag 6 is inserted and to insert the back part of the bag 6 sufficiently deep into the oil tank 1. 9 is used.
[0060]
This sheath 9 may be removed from the oil tank 1 after the bag 6 is inserted and before the bag 6 is inflated. In this embodiment, however, the sheath 9 is surrounded by a peripheral wall in order to make the operation as simple as possible. The sheath 9 is opened in accordance with the expansion of the bag 6.
[0061]
After the bag 6 is inserted into the oil tank 1, the bag 6 is filled with a fluid. However, the type of the fluid is not particularly limited, and even if a liquid such as water or oil is used, air, nitrogen gas, carbon dioxide gas is used. A gas such as may be used.
[0062]
However, in order to shorten the filling time, it is preferable to use a fluid having a low viscosity. Therefore, it is preferable to use a gas having a lower viscosity than the liquid. Examples of the gas include engine exhaust, air, nitrogen gas, and carbon dioxide gas. Is an example.
[0063]
Among these gases, it is recommended to use an inert gas such as nitrogen gas or carbon dioxide gas that does not pose a fire hazard. In this embodiment, particularly, a large amount of gas can be transported by liquefaction. Nitrogen gas that can be liquefied inexpensively because of its relatively high liquefaction point is used.
[0064]
In order to fill the bag 6 with fluid, fluid supply means 8 for supplying fluid into the bag is used. As the fluid supply means 8, there are engines, compressors, pumps and the like mounted on ships, vehicles, etc. It is conceivable to collect and discharge a necessary amount of fluid from the above and a container (cylinder) containing a predetermined amount of pressurized fluid or liquefied product thereof, but the former does not limit the amount of fluid to be supplied The latter is advantageous in that it can be used even where fluid cannot be easily collected from the surroundings.
[0065]
In this embodiment, the accident occurrence point is not specified in advance, and the fluid supply means 8 is configured by a container containing liquefied nitrogen so that the oil tank sealing device 5 can be used at any accident site.
[0066]
The fluid supply means 8 can be stored in the bag 6 in advance or inserted into the bag 6 at the time of use. Here, the fluid supply means 8 can be used for any of various types of bags 6 having different volumes. In order to be able to supply, it connects with the bag 6 from the outside via the connection apparatus 10 at the time of use.
[0067]
In the present invention, by fixing the bag 6 to the oil tank 1 is essential that, in this embodiment, in order to prevent the bag 6 is moved from the proper position on closing the opening, the bag 6 Before inflating (or during or after inflating), the bag 6 is fixed to the string outer plate 3 of the oil tank 1 using the bag fixing means 11, and the bag 6 closes the opening 4. The function is maintained stably.
[0068]
That is, the bag fixing means 11 according to the present invention only needs to be configured so that the bag 6 can be fixed to the string outer plate 3. In this embodiment, the main body portion 12 fixed to the outer wall surface of the oil tank 1 and A fixing means 13 for fixing the main body 12 to the outer wall surface of the oil tank 1, and a bag 6 fixed to the main body 12 and provided with slits 18 at an appropriate interval in the circumferential direction of the outer end. includes a bag insertion portion 14 but is inserted, the bag insertion portion bag 6 is inserted into 14 and sheath 9 of a bag fixing portion 15 for fixing to the bag insertion portion 14.
[0069]
The main body 12 stably fixes the bag 6 to the oil tank 1, and in order to more reliably prevent oil leakage from the opening of the oil tank, the main body 12 has a rubber plate having a larger area than the opening 4, for example, It is formed of a flexible material such as a plastic plate so that the main body 12 can be deformed following the outer wall surface of the oil tank 1, and the main body 12 is in close contact with the opening 4 on the outer wall surface of the oil tank 1 over the entire outer periphery. To be able to land on.
[0070]
The fastening means 13 is not particularly limited, but since the string outer plate 3 of the oil tank 1 is made of magnetic steel, there is no risk of fire occurring during the fastening work, and for fastening. Further, a magnet that does not require drilling or bolt welding or the like in the string outer plate 3 of the oil tank 1 is used.
[0071]
The fixing means 13 can be composed of a main body portion 12 in which a magnetic material such as iron powder is kneaded and an electromagnet that magnetizes the magnetic material. In order to facilitate the attachment work of the oil tank 1 to the oil tank 1, it is composed of a plurality of electromagnets supported on the main body part 12 at an appropriate interval, and the main body part 12 is placed on the outer wall surface of the oil tank 1 at an appropriate distance. Electroadsorption is performed at multiple locations.
[0072]
Here, it is conceivable to use a permanent magnet in place of the electromagnet, but it is advantageous to use an electromagnet that can turn on and off the magnetic force as necessary in order to facilitate the work of attaching the main body 12 to the oil tank 1. .
[0073]
The bag insertion portion 14 is formed in a cylindrical shape or a boss shape having a bag insertion hole 17 in the center, and the method for fixing the bag insertion portion 14 to the main body portion 12 is not particularly limited. For example, the two parts can be integrally molded, the two parts that have been molded separately can be connected inseparably by bonding, welding, fusion, fitting, etc., or can be separated by screwing, fitting, screwing, pinning, etc. Here, both are integrally formed.
[0074]
The bag fixing tool 15 may be provided in the oil tank 1, but here it is provided outside the oil tank 1 so that the fixing condition of the bag 6 to the bag insertion portion 14 can be easily observed.
[0075]
Moreover, as this bag fixing tool 15, the inside expansion type which presses the bag 6 to the bag insertion part 14 from the inner side of the bag 6 inserted in the bag insertion part 14, and the bag insertion part 14 were inserted in the inner side. It is conceivable to use an external compression type that is fastened to the bag 6.
[0076]
Here, in order to make it easy to observe how the bag 6 is fixed to the bag insertion portion 14, an outer compression type is used, and the outer end portion of the bag insertion portion 14 is fastened to the bag 6. A slit 18 is provided at an appropriate interval in the circumferential direction, and a bag fitting 15 is constituted by a fastening metal fitting 19 fitted on the outer end portion of the bag insertion portion 14 and a fastening member 20. .
[0077]
This bag fixing means 11 inserts the bag 6 in advance, connects the fluid supply means 8 to the bag 6, and then inserts the sheath 9 and the bag 6 inserted inside thereof into the opening 4 to an appropriate depth, The bag 6 is filled with a fluid, the bag 6 is expanded, the opening 4 is closed from the oil tank 1 with the bag 6, and then the fastening means 13 made of an electromagnet is energized, whereby the outer surface of the string outer plate 3, i. 1 is fixed to the outer surface. Then, the bag 6 is fixed to the bag insertion portion 14 with the bag fixing tool 15, whereby the bag 6 is fixed at a position suitable for sealing the opening 4.
[0078]
The oil in the oil tank 1 does not flow out of the opening 4 when the bag 6 expands and closes the opening 4, but the body 12 of the bag fixing means 11 is fixed to the outer surface of the string outer plate 3. The outflow from the opening 4 is further reliably prevented.
[0079]
As a result, the amount of oil spill can be reduced, the damage scale can be reduced, and the labor and time required for recovery work such as oil recovery can be reduced.
[0080]
Further, the fluid supply means 8 can be used for expanding other bags 6 after the bags 6 are inflated and separated from the bags 6.
[0081]
When the connection between the bag 6 and the fluid supply means 8 can be interrupted in this way, the oil tank sealing means 5 can be separated and transported during transportation of the oil tank sealing means 5 to the damaged area, thereby reducing the transportation space. This is extremely advantageous in facilitating the installation work of the bag 6 in the damaged area and the common use of the fluid supply means 8 between the bags of different sizes.
[0082]
In the above embodiment, the fluid supply means 8 is installed outside the bag 6. However, when the fluid supply means 8 is stored in the bag 6 in advance, the bag 6 sealed as the bag 6 is used. Can be used.
[0083]
Furthermore, in the above embodiment, the sheath 9 is used to insert the back part of the bag 6 sufficiently deeply into the oil tank 1, but it is also possible to insert a shape retainer into the contracted bag 6. The inner part of the bag 6 can be inserted deeply into the oil tank 1. This shape retainer may be extracted from the bag 6 before the bag 6 is inflated or may remain in the bag when the bag 6 is inflated.
[0084]
The bag 6 may be fixed to the oil tank 1 before the bag 6 is inflated or may be performed while the bag 6 is inflated.
[0088]
【The invention's effect】
As described above, according to the present invention, the bag that is inserted into the oil tank from the opening opened in the wall of the oil tank and then inflated larger than the opening in the oil tank, and the inner part of the bag are placed in the oil tank. A sheath for covering the shrunk bag, a fluid supply means for supplying fluid into the bag, and a bag fixing means. The bag fixing means is provided at the opening on the outer wall surface of the oil tank. A body part that is firmly attached to the body, a fastening means for fastening the body part to the outer wall surface of the oil tank, and an appropriate interval in the circumferential direction of the outer end part that is fixed to the body part. Since the bag insertion part provided with the slit and the bag fixing part for fixing the bag and the sheath inserted through the bag insertion part to the bag insertion part, the main body part is sized to cover the opening of the oil tank. The oil in the oil tank is opened when the bag expands and closes the opening. Although the main body covers the opening in the outer wall of the oil tank, the oil flow from the opening can be stopped more reliably, and the oil outflow from the oil tank can be stopped within a short time. It is possible to reduce the damage scale and reduce the labor and time for recovery work such as oil recovery.
In the present invention, since the bag can be fixed at a position suitable for closing the opening, the function of the bag closing the opening can be stably maintained.
[0089]
Oite this onset bright, especially when provided a valve for opening and closing the mouth-to mouth of the bag, close the mouth of the bag after being filled with a fluid bag, to separate the fluid supply means and the bag And fluid supply means can be used to inflate other bags.
[0090]
Oite this onset bright, especially wherein when the fluid supply means is a vessel containing compressed air or liquefied gas may be used even where not readily collected fluid from the periphery, the oil bath seal device of any accident site Can be used.
[0093]
Further, in the present invention, in particular, the bag fixing means is fixed to the outer wall surface of the oil tank, a fixing means for fixing the main body part to the outer wall surface of the oil tank, and the main body part. A bag insertion portion through which the bag is inserted, and a bag fixing tool for fixing the bag inserted through the bag insertion portion to the bag insertion portion, and the fastening means is composed of a permanent magnet or an electromagnet carried by the main body portion. Since there is no risk of sparks when fixing the bag to the oil tank, there is no risk of inducing a fire.
[Brief description of the drawings]
FIG. 1 is a principle diagram of an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a valve according to an embodiment of the present invention.
FIG. 3 is an explanatory view of how to fold a bag according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oil tank 3 String outer plate 4 Opening part 5 Oil tank sealing device 6 Bag 7 Valve 8 Fluid supply means 9 Sheath 11 Bag fixing means 12 Main body part 13 Fixing means 14 Bag insertion part 15 Bag fixing tool

Claims (6)

A bag that is inserted into the oil tank from the opening opened in the wall of the oil tank and then inflated larger than the opening in the oil tank, and a sheath that covers the contracted bag in order to insert the back part of the bag into the oil tank. And fluid supply means for supplying fluid into the bag, and bag fixing means for fixing the bag to the wall of the oil tank,
The bag fixing means includes a main body portion that is firmly attached to the opening on the outer wall surface of the oil tank over the entire outer periphery, a fixing means that fixes the main body portion to the outer wall surface of the oil tank, and the main body portion. A bag insertion portion that is fixed and provided with slits at appropriate intervals in the circumferential direction of the outer end portion , and a bag fixing portion that fixes the bag and the sheath inserted through the bag insertion portion to the bag insertion portion; Consists of
The bag fixing part is an oil tank sealing device characterized in that the fastening metal fitting is externally fitted into a slit portion of the bag insertion part and tightened, and the bag insertion part is fixed by being crimped to the bag and the sheath .   The oil tank sealing device according to claim 1, wherein the bag is formed of a stretchable film body.   The oil tank sealing device according to claim 1 or 2, wherein the bag is provided with a valve for opening and closing the mouth.   The oil tank sealing device according to any one of claims 1 to 3, wherein the fluid supply means is a container in which compressed gas or liquefied gas is contracted.   The oil tank sealing device according to any one of claims 1 to 4, wherein the main body is formed in a size that covers an opening of the oil tank.   The oil tank sealing device according to any one of claims 1 to 5, wherein the fastening means comprises a permanent magnet or an electromagnet carried on the main body.

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