JP4056078B1 - Gas / liquid leak prevention method - Google Patents

Abstract

The present invention provides a gas / liquid leak prevention method capable of repairing a leak in a metal tank or the like without removing the internal gas / liquid.
A gas / liquid leak prevention method according to the present invention includes a step of attaching a seal material to a gas leak location / liquid leak location, a step of attaching a putty material to the seal material, and a reinforcing sheet on the putty material. It comprises a step of pasting a material and a step of pasting glass fiber reinforced plastic (FRP) on a reinforcing sheet material. The sealing material is an acrylic composite main agent. Further, the reinforcing sheet material is formed by adhering aramid fibers, and always applies a pressure from the outside to the leak portion to stop the leak. Further, the glass fiber reinforced plastic (FRP) is of an ultraviolet curable type.
[Selection] Figure 3

Description

  The present invention relates to a gas / liquid leak prevention method that enables repair of a leak in a metal tank or the like without removing the gas / liquid inside.

  Conventionally, for example, when an internal gas or liquid leaks in a metal tank or the like where no pressure is applied, various leak repairs have been performed to prevent the gas or liquid from leaking out. Yes.

  For example, the steel plate was welded to the leaked portion, then cement-based resin was applied, and a rubber tube or the like was wound around.

  On the other hand, in a metal tank or the like under pressure, various leak repairs are performed to prevent leakage of the gas or liquid when the gas or liquid inside leaks.

For example, as shown in FIGS. 3 (a) and 3 (b), a pinhole is formed in a narrow gap in the connecting portion of the bellows Q, which is a ventilation body connected to a high-pressure tank for gas supply by welding or the like, due to pressure in the tank. In many cases, a leaked portion R in the form of a crack or a crack occurs.

  In addition, there may be a case where a leak portion R occurs in the oil passage connected to the high pressure tank for oil supply by welding or the like.

  In the repair of the connecting portion of the oil leakage point in the oil passage body of such a high-pressure tank, for example, as disclosed in Patent Document 1, a concave ring groove is formed in the abutting plate in the connecting portion. By providing a filling layer with a sealing agent on the body, the portion is protected from wind and rain, etc., and a protective device for an oil passage connecting portion that prevents oil leakage of bolts, nuts, packing, etc. due to corrosion or premature aging, and its There is a method technology.

  This sealing agent is composed of a liquid A and a liquid B. Of these, the liquid A is a base (main agent) of a sealing agent such as a paint or an adhesive, and is a liquid epoxy resin or a liquid modified epoxy resin (bisphenol A). Type epoxy resin or polysulfide liquid modified epoxy resin) and aluminum oxide powder for obtaining sufficient heat resistance against heat generated by a transformer or the like are mixed at a predetermined ratio.

  The epoxy that is the main component of the liquid A is liquid in the state of a monomer, or is dissolved in a small amount of an organic solvent and has fluidity, and has flexibility after the sealing agent is cured. It is.

  Then, for example, 55 to 75% of polysulfide liquid modified epoxy resin and 25 to 45% of aluminum oxide powder are appropriately set according to the use location and use conditions with respect to 100% of the total amount of the liquid A. The viscosity is adjusted to 1,000,000 to 2,000,000 cps.

The B liquid is used as a curing agent for the A liquid. The liquid polymercaptan serving as the base, a liquid tertiary amine, a reinforcing agent for the amine, and a light calcium carbonate for increasing the base. In order to obtain impact resistance, weather resistance, fluidity adjustment or thixotropy imparting, an inorganic oxalate aluminate is mixed in a predetermined ratio.
Japanese Patent No. 3454239

  However, in the repair of leaks when internal gas or liquid leaks out in a metal tank or the like where no pressure is applied, it is possible to temporarily prevent leakage of gas and liquid, but various types including ultraviolet rays and the like Due to the factors, the repaired part is deteriorated, and the leakage of gas or liquid may not be prevented for a long time.

  On the other hand, when internal gas or liquid leaks in a metal tank or the like under pressure, basically it is necessary to temporarily stop the flow of the ventilation body or oil passage and then repair the leak. It was.

  Therefore, it is necessary to complete the leak repair work in as short a time as possible, but the repair work may take a long time depending on the situation in which gas or liquid leaks.

  Under such circumstances, there has been a strong demand for the emergence of a technique capable of repairing leaks without removing high-pressure gas or high-pressure liquid in the tank.

  If a gas leak is actually found in a high-pressure tank for supplying gas under pressure, etc., use various liquid seals and metal seals recommended by the manufacturer for the relevant location. Attempts were made to prevent leakage at the connecting portion between the tank and the bellows without draining the high-pressure gas, but none of them could be completely prevented from leaking.

  In addition, the caulking process was carried out on all leaky bellows using putty material, but the actual situation is that the leak has not been completely stopped.

  In addition, the conventional filling layer with a sealing agent must have a fast-curing innermost layer, and the outermost layer must be a multiple layer that has flexibility even if it is slow-curing. there were.

  For this reason, for example, before the sealing agent penetrates into a pinhole-like leak location existing in a narrow gap such as a bellows connection portion of a metal container, the sealing agent itself is immediately cured, and sufficient leak repair can be performed. There was no evil.

  Therefore, the present invention was created in view of the existing circumstances as described above, and when an internal gas or liquid leaks in a metal tank or the like that is not under pressure, the gas or liquid It is an object of the present invention to provide a gas / liquid leak prevention method capable of reliably preventing leakage and preventing gas and liquid leakage over a long period of time.

  In addition, the present invention provides a pinhole or crack that exists in a narrow gap in the connecting portion between the tank and the bellows without removing high-pressure gas or high-pressure liquid in the tank. It is an object of the present invention to provide a gas / liquid leak prevention method capable of easily and reliably repairing a leaked portion.

The method for preventing leakage of gas / liquid according to the present invention includes an A main agent containing cumene hydroperoxide, a B main agent containing acid phosphooxyethyl methacrylate and 2-imidazolidinethione at a gas leak location / liquid leak location existing in a narrow gap. A step of attaching a sealing material using an acrylic composite main agent obtained by mixing two liquids of
Attaching a putty material for temporary leakage prevention to the sealing material;
A step of pasting UV curable glass fiber reinforced plastic (FRP) on the sealing material and putty material;
By solving, the above-mentioned problems are solved.

In addition, the gas / liquid leak prevention method according to the present invention includes an A main agent containing cumene hydroperoxide, acid phosphooxyethyl methacrylate, and 2-imidazolidinethione at a gas leak location / liquid leak location existing in a narrow gap. A step of attaching a sealing material using an acrylic composite main agent in which two liquids of the B main agent are mixed;
Attaching a putty material for temporary leakage prevention to the sealing material;
A step of sticking a reinforcing sheet material formed by adhering an aramid fiber to a sealing material and a putty material, and constantly applying pressure from the outside to the leak location to stop the leak;
A step of attaching an ultraviolet curable glass fiber reinforced plastic (FRP) to the reinforcing sheet material;
The problem mentioned above was solved by comprising.

  The method for preventing leakage of gas / liquid according to the present invention includes a step of attaching a sealing material to a gas leakage location / liquid leakage location, a step of attaching a putty material to the sealing material, and a glass fiber reinforcement to the sealing material and the putty material. Because it consists of a process of attaching plastic (FRP), when internal gas or liquid leaks out in a metal tank that is not under pressure, it is surely prevented from leaking out the gas or liquid can do.

  In addition, since it includes a step of attaching glass fiber reinforced plastic (FRP) to the sealing material and putty material, the situation where the repaired portion deteriorates due to various factors including ultraviolet rays is prevented. Leakage can be prevented for a long time.

  On the other hand, the gas / liquid leak prevention method according to the present invention includes a step of attaching a seal material to a gas leak location / liquid leak location, a step of attaching a putty material to the seal material, and a reinforcing sheet material to the putty material. Because it consists of the step of attaching and the step of attaching glass fiber reinforced plastic (FRP) to the reinforcing sheet material, in a metal tank or the like under pressure, without removing the internal gas or liquid , Leakage of the gas or liquid can be reliably prevented.

  Specifically, since it includes a step of attaching a reinforcing sheet material to the putty material, for example, a pin that exists in a narrow gap in the connecting portion between the tank and the bellows without removing the high-pressure gas or high-pressure liquid in the tank. Hole-shaped or crack-shaped leak points can be repaired easily and reliably.

  Since this sealing material is an acrylic composite main agent, the acrylic sealing material can easily enter the pinhole-shaped or crack-shaped leak location that exists in the narrow gap in the connecting portion between the tank and the bellows. Therefore, it is possible to reliably perform leak repair in detail.

  In addition, since the acrylic composite main agent is a mixture of two liquids of A main agent containing cumene hydroperoxide and B main agent containing acid phosphooxyethyl methacrylate and 2-imidazolidinethione, The time from mixing with the B main agent to curing can be set to about 6 minutes.

  This makes it possible to install acrylic sealing material up to pinhole-shaped or crack-shaped leaks that exist in narrow gaps at the connection between the tank and bellows. As a result, leak repair in detail is performed reliably. be able to.

  Furthermore, the putty material is used for temporarily preventing leakage, and can reliably stop leakage due to the pressure of high-pressure gas, high-pressure liquid, etc. in the tank after the acrylic sealing material is applied.

  Further, the reinforcing sheet material is formed by adhering aramid fibers, and always applies a pressure from the outside to the leak portion to stop the leak. Therefore, it is possible to easily and reliably repair a pinhole-like or crack-like leak location that exists in a narrow gap in the connecting portion between the tank and the bellows without removing high-pressure gas, high-pressure liquid, etc. in the tank. It can be done.

  In addition, since glass fiber reinforced plastic (FRP) is of an ultraviolet curable type, it can be shielded from the outside air and has high weather resistance, so that deterioration of the inner acrylic sealing material can be prevented in advance. it can.

  That is, the glass fiber reinforced plastic (FRP) having flexibility is instantly cured by irradiating with ultraviolet rays, and exhibits a strong adhesion function to the inner acrylic sealing material. .

  At the same time, it is possible to prevent the acrylic sealing material from being deteriorated by receiving ultraviolet rays or visible rays, and to enhance the leakage prevention effect.

  Moreover, any shape of the leak repair portion can be accommodated, and there is no need for pre-shaping.

  Furthermore, compared with the conventional thermosetting type glass fiber reinforced plastic (FRP), there is no variation due to a mixing error or the like, and it is an environmentally friendly repair material.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the gas / liquid leak prevention method according to the present invention, when an internal gas or liquid leaks out in a metal tank or the like that is not under pressure, the gas or liquid leak is reliably prevented over a long period of time. There are things to prevent, and those that repair a leaked part easily and reliably without removing high pressure gas, high pressure liquid, etc. in the tank in a metal tank or the like under pressure.

  The former method for preventing leakage of gas / liquid includes the step of attaching the sealing material 1 to the gas leakage location / liquid leakage location, the step of attaching the putty material 2 to the sealing material 1, and the sealing material 1 and the putty material 2 And a step of attaching glass fiber reinforced plastic (FRP) 4.

Then, the leakage preventing member, shea Lumpur material (1), putty 2, using glass fiber reinforced plastic (FRP) 4.

  On the other hand, the latter method for preventing leakage of gas / liquid includes a step of attaching a sealing material 1 to a gas leakage location / liquid leakage location, a step of attaching a putty material 2 to the sealing material 1, and a reinforcing sheet on the putty material 2. It comprises a step of attaching the material 3 and a step of attaching a glass fiber reinforced plastic (FRP) 4 to the reinforcing sheet material 3.

Then, the leakage preventing member, shea Lumpur material (1), putty 2, reinforcing sheet 3, using a glass fiber reinforced plastic (FRP) 4.

  The sealing material (1) as a leak stopper is an acrylic composite main agent. Specifically, the acrylic sealing material 1 is composed of an A main agent and a B main agent.

  And by mixing these A main ingredients and B main ingredients, it hardens | cures in a state harder than rubber | gum after about 6 minutes.

  When using this acrylic sealing material 1, these two main ingredients are mixed and then applied with a spatula or the like.

Specifically, for example, when the wall surface leakage portion R of the tank which is not under pressure occurs, in which the leakage portion R of this smear acrylic sealant 1 with a spatula or the like.

On the other hand, when the leakage portion R to the wall surface of the high-pressure tank that is under pressure occurs, in which the leakage portion R of this smear acrylic sealant 1 with a spatula or the like.

In the case of repairing the leakage portion R the connection portion in the narrow gap pinhole-shaped occurred or crack-like bellows Q connected by welding or the like to the high-pressure tank, as shown in FIG. 1 (a), the bellows For example, it is attached to the pinhole-shaped or crack-shaped leaked portion R generated in a narrow gap at the Q connecting portion by pushing with a spatula or the like.

  At this time, since the acrylic sealing material 1 has flexibility before curing, the acrylic sealing material 1 is pushed down to the pinhole-like leak point R generated in the narrow gap in the connection portion, and thereby the leak point R Is blocked.

Putty material 2 as the leak preventing member, for example, when the leakage portion R occurs in the wall of the tank which is not under pressure, to attached from the top of A acrylic-based sealing material 1 so as to close the vicinity of the leak point R It is.

  On the other hand, when a leak location R occurs on the wall surface of the high-pressure tank that is under pressure, the putty material 2 as a leak stop member is used for temporary leak stop.

For example, when smear acrylic sealant 1 to rie leakage portion R, the gas pressure, hole occurs in the acrylic sealant 1. To prevent this, it is to attached from the top of A acrylic-based sealing material 1 so as to close the vicinity of the leak point R.

When repairing a leak location R that occurs in a narrow gap in the bellows Q connected to the high-pressure tank, as shown in FIG. 1 (b), at the exposed portion of the bellows Q where a hole may occur due to gas pressure or the like. The putty material 2 is concentrated on the acrylic seal material 1.

  After the putty material 2 is attached, leak leakage can be temporarily prevented for about 6 minutes until the acrylic sealing material 1 is cured.

  The reinforcing sheet material 3 as a leak stopper is used for repairing a leak portion R such as a metal tank under pressure.

  The reinforcing sheet material 3 is formed, for example, by affixing aramid fibers as a concrete reinforcing agent to one side of a double-sided PSA sheet with an adhesive.

The reinforcement sheet 3, in rie leakage portion R, there is a possibility that the bumps may occur swollen acrylic sealant 1 and putty 2 by gas pressure. Therefore, the pressure from the outside over all times against rie leakage portion R, while preventing swelling of the acrylic sealant 1 and putty 2, realizes the leakage stop.

When repairing the leaked portion R generated in the narrow gap of the bellows Q connected to the high-pressure tank, as shown in FIG. 1 (c), in the exposed portion of the bellows Q that may be raised by gas pressure or the like. The reinforcing sheet material 3 is attached on the putty material 2.

  The glass fiber reinforced plastic (FRP) 4 as a leak stopper is made of polyester having a glass content of 30% and excellent in weather resistance and pressure resistance (1.2 MPa pressure resistance).

Moreover, the FRP of the ultraviolet curing which was formed into a sheet, after removing the release film subjected on one side, is adhered to the reinforcement sheet member 3 that it is attached to a Jo Tokoro of leakage portion R.

When repairing the leaked portion R generated in the narrow gap of the bellows Q connected to the high-pressure tank, as shown in FIG. 1 (d), the entire surface of the reinforcing sheet material 3 attached to the predetermined leaked portion R It is stuck so as to cover.

  The curing time of the glass fiber reinforced plastic (FRP) 4 is about 10 minutes to 50 minutes, and is longer than the curing time of the acrylic sealing material 1 of 6 minutes.

  By covering the surface of the acrylic sealing material 1 with the glass fiber reinforced plastic (FRP) 4, the electromagnetic sealing of the acrylic sealing material 1 is prevented and the leakage prevention effect is enhanced.

Thus, when repairing a leakage portion R such tanks made of metal that is not under pressure, the acrylic-based sealing material 1 layer as rie click stop material, putty 2 layer, glass fiber reinforced plastic (FRP ) Four layers are attached in a stacked state.

On the other hand, when repairing a leak location R such as a metal tank under pressure , as shown in FIG. 2 , one layer of acrylic sealing material, two layers of putty material, and a reinforcing sheet material as a leak stopper Three layers and four layers of glass fiber reinforced plastic (FRP) are attached in a stacked state.

  Finally, when repairing leaked points R such as metal tanks under pressure, one layer of acrylic sealing material, two layers of putty material, three layers of reinforcing sheet material, glass fiber reinforced plastic (FRP) A comparison test result between the case where the leaked portion R is repaired by the method of sequentially stacking four layers and the case where the repair is not performed will be described.

  Before repairing, a leak detector and soapy water confirmed that a crack was found at the caulking repair site, and a leak from this location was confirmed. At this time, when the leakage rate was confirmed by the accumulation method, the leakage amount was 7.5% per year, and the converted value of the gas pressure in the tank was reduced from 0.52 MPa to 0.51 MPa.

  On the other hand, after the repair, the leak rate was confirmed by the accumulation method. As a result, the leak rate was 0.0001% per year, and the converted value of the gas pressure in the tank remained at 0.51 MPa, and no change was observed. It was.

  The method for preventing leakage of gas / liquid according to the present invention is, for example, for repairing leaked parts such as a cylindrical oil passing body through which oils circulate, and a transformer for converting from a high voltage to a normal working voltage. Can also be used widely.

This shows the repair process when a pinhole-like or crack-like leaking part occurs in a narrow gap in the connection part of the bellows connected to the high-pressure tank by welding or the like. (A) shows the acrylic sealing material (B) is a cross-sectional view of a state in which a putty material is additionally attached from above, (c) is a cross-sectional view of a state in which a reinforcing sheet material is further attached from above, (d) is a further cross-sectional view of the state of being attached. It is sectional drawing of the state which stuck glass fiber reinforced plastic (FRP) from this. It is sectional drawing which shows the state after repair when the pinhole-shaped or crack-shaped leak location which generate | occur | produced in the narrow clearance gap in the said connection part of the bellows connected to a high pressure tank by welding etc. arises. A conventional example is shown, (a) is a plan view showing a state where a leaked portion has occurred in the connecting portion of the bellows connected to the high-pressure tank by welding or the like, and (b) is a part showing a peripheral configuration of the leaked portion. It is an expanded sectional view.

Explanation of symbols

Q ... Bellows R ... Leakage point 1 ... Acrylic sealant 2 ... Putty material 3 ... Reinforcement sheet material 4 ... Glass fiber reinforced plastic (FRP)

Claims (2)

Acrylic composite main agent containing two liquids, A main agent containing cumene hydroperoxide and B main agent containing acid phosphooxyethyl methacrylate and 2-imidazolidinethione, is used in gas leaks and liquid leaks in narrow gaps. A step of attaching the sealing material,
Attaching a putty material for temporary leakage prevention to the sealing material;
A step of pasting UV curable glass fiber reinforced plastic (FRP) on the sealing material and putty material;
A method for preventing leakage of gas / liquid characterized by comprising: Acrylic composite main agent containing two liquids, A main agent containing cumene hydroperoxide and B main agent containing acid phosphooxyethyl methacrylate and 2-imidazolidinethione, is used in gas leaks and liquid leaks in narrow gaps. A step of attaching the sealing material,
Attaching a putty material for temporary leakage prevention to the sealing material;
A step of sticking a reinforcing sheet material formed by adhering an aramid fiber to a sealing material and a putty material, and constantly applying pressure from the outside to the leak location to stop the leak;
A step of attaching an ultraviolet curable glass fiber reinforced plastic (FRP) to the reinforcing sheet material;
A method for preventing leakage of gas / liquid characterized by comprising:

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