JP4707406B2 - Safety valve apparatus for depositing underground liquid and apparatus and method for preventing deposit accumulation - Google Patents

Description

The present invention relates to a safety valve device installed in a pumping pipe for pumping a specification liquid stored in a liquid storage tank provided in a rock basement for storing a liquid such as crude oil or liquefied petroleum gas, and deposits such as calcium carbonate are present. The present invention relates to a safety valve apparatus deposit prevention apparatus and method for underground liquid storage equipment that prevents accumulation.

  FIG. 1 shows a configuration example of a storage tank (liquid storage tank) installed in a rock basement for storing liquid such as crude oil or liquefied petroleum gas (LPG). In the storage tank 1, bottom water (groundwater or the like) 10 is stored at the bottom 2, and a storage liquid 11 such as crude oil or liquefied petroleum gas is stored above the bottom water 10. The upper opening 3 of the storage tank 1 is sealed with a closing body 4 so that the gas 12 generated from the stored liquid 11 does not leak to the outside. In addition, the storage tank 1 is provided with a pumping pipe 6 extending from the pumping device 5 installed outside the storage tank 1 to the stored liquid 11. In the figure, 7 is a drain pipe for extracting the bottom water 10, and 8 is a gas drain pipe for extracting the gas 12.

  FIG. 2 shows a configuration example of the distal end portion of the pumped liquid pipe 6. As shown in the figure, a motor pump (submersible pump) 20 including a pump unit 21 and a motor unit 22 is attached to the tip of the pumped pipe 6. The motor pump 20 is installed in the protective tube 23. The motor pump 20 installed in the protective tube 23 is arranged in a cylindrical suction pot 24 installed in the bottom 2 of the storage tank 1. In the suction pot 24, an opening 24 a provided in the upper portion thereof is positioned above the interface 13 between the bottom water 10 and the stored liquid 11, and the stored liquid (specification liquid) flowing in from the opening 24 a is accumulated therein. It is like that. When the motor pump 20 is operated, the specification liquid flows into the protective tube 23 from the opening 23 a below the protective tube 23 and is sucked into the suction port 25 of the motor pump 20. The specification liquid discharged from the motor pump 20 is pumped up to the outside of the storage tank 1 through the pumping pipe 6.

  However, if the pinhole is opened in the protective tube 23 for some reason or the welded portion of the protective tube 23 is cracked and damaged, the specification liquid leaks from the damaged portion and flows out to the ground. There is a risk that the generated gas may be in danger such as being ejected into the atmosphere. In the worst case, the spilled liquid or spouted gas will catch fire, leading to an accident such as a fire or explosion.

  Conventionally, in order to prevent the above-mentioned accident, when a damaged portion occurs in the protective tube 23, the interface liquid 13 is raised to replace the stored liquid 11 with the bottom water 10 to protect the specification liquid in the protective tube 23. By encapsulating the inside of the tube 23, the amount of liquid or gas released into the atmosphere at the above-ground part is limited to ensure safety. However, in this method, since it takes a very long time to replace a large amount of the stored liquid 11 with the bottom water 10, there is a problem in that the outflow of the specification liquid from the damaged portion cannot be stopped.

  Therefore, as shown in FIG. 3, the example which installs a safety valve apparatus (emergency shut-off valve apparatus) in the protective tube 23 has increased (patent document 1). FIG. 3 is a diagram showing a configuration example of a safety valve device installed at the lower part of the motor pump 20 in the protective tube 23. As shown in the figure, a short pipe 26 having a specification liquid passage 27 is installed at the bottom of the motor section 22, and a safety valve device 30 is installed below the short pipe 26. The safety valve device 30 includes a valve seat 31 installed in a flow path leading to the specification liquid passage 27 and a valve body 32 installed to be movable in the vertical direction with respect to the valve seat 31 (safety valve main body). 33 and an attachment member 40 for attaching the safety valve 33 to the protective tube 23. The valve body 32 has a shape in which a valve rod 35 is connected to a lower portion of a seat portion 34 that abuts the valve seat 31 and closes the flow path, and is biased upward by a resilient means such as a spring (not shown). On the other hand, above the safety valve 33, a hydraulic pipe 36 for supplying pressure oil toward the upper part of the valve body 32 is installed. Normally, hydraulic pressure is always supplied from the ground portion to the valve body 32 by the hydraulic pipe 36, and the safety valve 33 is kept open against the spring force of the spring.

  The safety valve 33 is attached to the flange portion 45 formed at the upper end of the tubular attachment member 40 with the valve seat 31 being inserted and fixed. Further, the valve stem 35 is slidably supported and attached to a bearing (not shown). On the other hand, the lower end portion of the protective tube 23 is a cylindrical seal portion 23c having a slightly smaller diameter than the main body portion 23b of the protective tube 23. An attachment member 40 to which the safety valve 33 is fixed is inserted and attached to the inner peripheral surface of the seal portion 23c from above. A contact portion between the mounting member 40 and the seal portion 23 c is hermetically fixed by a gasket 41. The safety valve 33 attached to the protective tube 23 by the attachment member 40 can be removed at the gasket 41 portion, and can be removed by pulling upward during maintenance or repair.

The safety valve device 30 stops the pressure oil supplied from the hydraulic pipe 36 to the valve body 32 when the protection pipe 23 is damaged, thereby allowing the valve body 32 to have the spring elasticity and the storage tank 1. The safety valve 33 can be urgently closed by moving upward by the internal pressure (specific fluid pressure). As a result, the flow of the specification liquid into the damaged portion of the protective tube 23 is stopped.
Japanese Patent Publication No. 1-58400

  By the way, in the liquid storage tank 1 in the bedrock shown in FIG. 1, in order to obtain a sealing effect, mortar is applied to the inner surface of the bedrock to form a mortar layer. Therefore, the pH of the bottom water 10 increases due to the influence of mortar, and precipitation of calcium carbonate or the like occurs. Then, this calcium carbonate or the like is deposited in the stored liquid 11, deposits are deposited on each part such as the valve seat 31 and the valve body seat part 34 of the safety valve device 30, and the malfunction of the safety valve 33 occurs. In addition, if deposits accumulate on the gasket 41 between the mounting member 40 of the safety valve device 30 and the protective tube 23 or in the vicinity thereof, there is a problem that the safety valve device 30 cannot be pulled out and removed.

The present invention has been made in view of the above points, and its purpose is to deposit precipitates such as calcium carbonate on a safety valve device installed in a pumping pipe or the like for pumping a specification liquid from a liquid storage tank provided in the bedrock basement. It is an object of the present invention to provide an apparatus and a method for preventing deposit accumulation in a safety valve device for underground liquid storage equipment that prevents accumulation of water.

The invention according to claim 1 for solving the above problems is provided in the basement, to the liquid being pumped liquid reservoir Ca content flows out to the specifications liquid reservoir, the specification liquid stored in the liquid storage tank liquid being pumped a tube, a safety valve device having a safety valve to block the specification liquid through the該揚liquid pipe in an emergency is installed in該揚liquid pipe, in an underground liquid storage equipment provided with, deposited by Ca content contained in the specification liquid was a safety valve apparatus precipitate deposition preventing device for preventing the precipitates deposited on the safety valve device such as a carbonate Improvement of a Saline, the liquid being pumped tube and the safety valve device is disposed in the protective tube, the safety valve device In the protective tube on the upstream side in the vicinity of the specification liquid suction port, a chemical liquid injection pipe with an open chemical liquid injection port is installed, and the chemical liquid for preventing precipitation of the precipitate is injected into the specification liquid through the chemical liquid injection pipe To configure Chemical inlet of the liquid injection pipe, characterized in that it opens the safety valve of the safety valve device in the gasket vicinity between attached and the mounting member and the protective tube into the protective tube.

The invention according to claim 2 is the safety valve device deposit accumulation prevention device of the underground liquid storage facility according to claim 1, wherein the chemical solution injection port of the chemical solution injection pipe is a valve seat constituting a safety valve of the safety valve device, It is also open near the valve seat and valve shaft bearing
It is characterized by that.

According to a third aspect of the present invention, in the safety valve device deposit accumulation preventing device according to the first or second aspect , a shutoff mechanism is installed in the chemical injection pipe , and the safety valve device is interlocked with a closing operation of the safety valve. The shut-off mechanism is operated to block the flow of the chemical solution injection pipe, or a check valve for preventing a backflow is provided in the chemical solution injection pipe .

The invention according to claim 4 is provided in the basement, a liquid storage tank in which Ca content flows out to the stored specification liquid, a pumping pipe for pumping the specification liquid stored in the liquid storage tank, and the pumping liquid In an underground liquid storage facility provided with a safety valve device provided with a safety valve that shuts off the specification liquid that passes through the pumping pipe in an emergency, and deposited in a pipe, precipitation of calcium carbonate and the like precipitated due to Ca contained in the specification liquid A safety valve device for preventing deposits from depositing on the safety valve device, the deposit prevention device for deposits, wherein the liquid lifting pipe and the safety valve device are installed in a protective tube, and near the specification liquid suction port of the safety valve device A chemical solution injection pipe having a chemical solution injection port opened in the protective tube on the upstream side, and configured to inject a chemical solution for preventing the precipitation of the precipitate into the specification solution through the chemical solution injection pipe, the chemical solution injection In the piping, A mechanism is installed and configured so that the shut-off mechanism is operated in conjunction with the closing operation of the safety valve of the safety valve device to block the flow of the chemical solution injection pipe, or the reverse flow is prevented to prevent backflow in the chemical solution injection pipe. A stop valve is provided .

  The invention according to claim 5 is the safety valve device deposit accumulation prevention device of the underground liquid storage facility according to claim 4, wherein the chemical solution inlet of the chemical solution injection pipe is a valve seat that constitutes a safety valve of the safety valve device, It is characterized by opening in the vicinity of the valve body seat part and the valve stem bearing part.

  The invention described in claim 6 is a liquid storage tank that is provided in the basement and from which Ca content flows out to the stored specification liquid, a pumping pipe for pumping the specification liquid stored in the liquid storage tank, and the pumping liquid. In an underground liquid storage facility provided with a safety valve device provided with a safety valve that shuts off the specification liquid that passes through the pumping pipe in an emergency, and deposited in a pipe, precipitation of calcium carbonate and the like precipitated due to Ca contained in the specification liquid A safety valve device deposit prevention method for preventing deposits on the safety valve device, wherein the deposit is deposited on the specification liquid in the vicinity of the safety valve device in a protective pipe provided with the liquid pumping tube and the safety valve device. Injecting a chemical solution for preventing the deposition of an object, allowing the specification solution into which the chemical solution has been injected to be pumped through the safety valve and the lift pipe, and the chemical solution injected into the specification solution in the protective tube is Safety valve device safety valve Characterized in that as well spread over the gasket vicinity between the protective tube attached has the mounting member and the protective tube.

According to the invention described in claim 1 of the present application, a chemical liquid injection pipe having a chemical liquid inlet opening is installed in a protective pipe on the upstream side in the vicinity of the specification liquid suction port of the safety valve device, and the precipitate is added to the specification liquid through the chemical liquid injection pipe. Therefore, the specification liquid into which the chemical solution is injected is pumped through the safety valve and the pumping pipe. Therefore, it is possible to effectively prevent deposits such as calcium carbonate in the vicinity of the safety valve device and its vicinity due to Ca contained in the specification liquid, and to avoid inconveniences such as malfunction of the safety valve device in an emergency. Therefore, safety in the underground liquid storage facility can be ensured. In addition, since the chemical injection port of the chemical injection pipe is opened in the vicinity of the gasket portion between the mounting member and the protective tube that attaches the safety valve of the safety valve device to the protective tube, the gasket portion between the mounting member and the protective tube It is possible to prevent deposits such as calcium carbonate from depositing and accumulating, and the safety valve device can be pulled out and removed or reattached for maintenance and repair, thereby improving work efficiency.

According to the second aspect of the present invention, the chemical injection port of the chemical injection pipe is also opened in the vicinity of the valve seat, the valve body seat portion, and the valve stem bearing portion constituting the safety valve of the safety valve device. This prevents the inconvenience that carbon dioxide accumulates on the valve seat, valve seat, valve shaft bearing, etc., and the safety valve does not operate in an emergency, thereby ensuring the safety in the underground liquid storage facility.

According to the third aspect of the present invention , a shut-off mechanism is installed in the chemical solution injection pipe, and the shut-off mechanism is operated in conjunction with the closing operation of the safety valve of the safety valve device to shut off the flow of the chemical solution injection pipe. Since the check valve for preventing backflow is provided in the chemical solution injection pipe, when the safety valve is closed in an emergency, the specification liquid in the protective pipe flows back through the chemical injection pipe and flows into the ground equipment. Can be prevented, and safety in the underground liquid storage facility can be secured.

According to the fourth aspect of the present invention, the chemical solution injection pipe having the chemical solution injection port opened in the upstream protective tube in the vicinity of the specification solution suction port of the safety valve device is installed, and the deposit of the deposit is added to the specification solution through the chemical solution injection pipe. Since the chemical liquid for preventing the precipitation is injected, the specification liquid into which the chemical liquid has been injected is pumped through the safety valve and the pump pipe. Therefore, it is possible to effectively prevent deposits such as calcium carbonate in the vicinity of the safety valve device and its vicinity due to Ca contained in the specification liquid, and to avoid inconveniences such as malfunction of the safety valve device in an emergency. Therefore, safety in the underground liquid storage facility can be ensured. In addition, a shut-off mechanism is installed in the chemical solution injection pipe, and the shut-off mechanism is operated in conjunction with the closing operation of the safety valve of the safety valve device so as to block the flow of the chemical solution injection pipe, or the chemical solution injection pipe In addition, a check valve that prevents backflow is provided, so that when the safety valve is closed in an emergency, the specification liquid in the protective pipe can be prevented from flowing back through the chemical injection pipe and flowing into the ground equipment. Safety in the liquid storage facility can be ensured.

According to the fifth aspect of the present invention, the chemical injection port of the chemical injection pipe is opened in the vicinity of the valve seat, the valve body seat portion, and the valve stem bearing portion that constitute the safety valve of the safety valve device. It is possible to avoid the inconvenience that carbon dioxide accumulates on the valve seat, valve seat, valve shaft bearing, etc. and the safety valve does not operate in an emergency, and safety in the underground liquid storage facility can be ensured.

  According to invention of Claim 6, the chemical | medical solution which prevents precipitation of a deposit is inject | poured into the specification liquid in the protective tube near a safety valve apparatus, and the specification liquid with which this chemical | medical solution was inject | poured passes through a safety valve and a pumping pipe. Pumped. Therefore, it is possible to effectively prevent deposits such as carbonic acid carbonate from depositing and depositing on the safety valve device and its vicinity due to Ca contained in the specification liquid, and avoiding inconveniences such as malfunction of the safety valve device in an emergency. Therefore, safety in the underground liquid storage facility can be ensured. In addition, the chemical solution injected into the specification liquid in the protective tube spreads in the vicinity of the gasket part between the mounting member and the protective tube, where the safety valve of the safety valve device is attached to the protective tube. Accumulation of calcium carbonate or the like on the gasket portion can be prevented, and the safety valve device can be pulled out and removed or reattached for maintenance or repair, thereby improving work efficiency.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 4 is a schematic cross-sectional side view showing a configuration example of a safety valve device provided with a deposit accumulation preventing apparatus according to an embodiment (Example 1) of the present invention. In the present embodiment shown in FIG. 4, the same reference numerals as those in the conventional example shown in FIG. 3 are common components, and detailed description thereof is omitted here. Hereinafter, the same applies to other embodiments. The deposit accumulation preventing device 50 shown in FIG. 4A is configured by installing a chemical solution injection pipe 51 for supplying a chemical solution to a position in the vicinity of the safety valve device 30 in the protective tube 23. The chemical injection pipe 51 communicates from a chemical supply device 44 (see FIG. 6) installed on the ground, passes through the flange portion 45 of the mounting member 40, is bent slightly toward the safety valve 33 at the bent portion 53, and has a lower end. The chemical solution inlet 52 provided in the part is installed so as to open toward the valve seat 31 and the valve body 32 of the safety valve 33. FIG. 4B is a diagram showing a detailed configuration of the bent portion 53 of the chemical solution injection pipe 51. As shown in the figure, the bent portion 53 can be configured by connecting two pipes.

  The chemical solution injected from the chemical solution injection pipe 51 is a chemical solution that prevents the Ca component contained in the specification solution from flowing out from the wall surface of the storage tank 1 and depositing as calcium carbonate, and is mainly a chemical solution that neutralizes alkali. is there. By regularly injecting the chemical solution from the chemical solution injection pipe 51, precipitation of calcium carbonate in the specification solution is always prevented.

  FIG. 5 is a diagram illustrating the flow of the specification liquid and the chemical liquid in the protective tube 23. In the figure, the flow of the specification liquid is indicated by a solid line, and the flow of the chemical liquid is indicated by a dotted line. Normally, the safety valve 33 is in an open state, and as shown in FIG. Since the chemical liquid injection port 52 of the chemical liquid injection pipe 51 is located in the specification liquid flow, the chemical liquid to be injected is appropriately mixed with the specification liquid. In addition, since the chemical liquid inlet 52 is opened and installed in a direction (opposite direction) substantially opposite to the flow of the specification liquid, there is an effect that the specification liquid flow is diffused by the flow of the chemical liquid. Mixing of specification liquid and chemical liquid is promoted.

  In particular, if deposits such as calcium carbonate are deposited and fixed on the valve seat 31 and the valve seat portion 34 of the safety valve 33, the safety valve 33 cannot be closed in an emergency. The chemical solution is distributed well to the contact portion of the body sheet portion 34. Further, if deposits accumulate in a gap portion of a bearing portion (not shown) that guides the valve stem 35, the valve body 32 cannot slide and the opening / closing operation of the safety valve 33 is hindered. Make sure that the chemical is well distributed.

  Further, the chemical solution is diffused by the liquid flow, so that it is possible to spread the chemical solution to the gasket 41 between the mounting member 40 and the protective tube 23 and the vicinity thereof. A situation in which the device 30 cannot be pulled out can be avoided.

  FIG. 6 is a diagram illustrating a configuration example of the upper end portion of the protective tube 23. A head plate 42 is attached to the upper end portion of the protective tube 23, and the inside of the protective tube 23 is kept in a sealed state. A shutoff valve (emergency shutoff valve) 43 is installed in the middle of the chemical solution injection pipe 51. The shutoff valve 43 is configured to operate in conjunction with the closing operation of the safety valve 33 and shut off the flow of the chemical solution injection pipe 51. Thereby, when the safety valve 33 is urgently closed, it is possible to prevent the specification liquid that has gone out of place from flowing backward through the chemical liquid injection pipe 51 and flowing into the ground equipment. Further, in place of the shutoff valve 43 for blocking the flow of the chemical liquid injection pipe 51, a check valve and a partition valve (not shown) for preventing the reverse flow of the flow of the chemical liquid injection pipe 51 may be provided.

  FIG. 7 is a diagram illustrating a configuration example of a deposit accumulation preventing apparatus according to another embodiment (Example 2) of the present invention. In the present embodiment, the chemical liquid injection pipe 51 is branched into two pipes 51a and 51b, and the lower ends thereof are used as the chemical liquid injection ports 52a and 52b. One chemical solution injection port 52a is installed so as to open toward the valve seat 31 and the valve body 32 of the safety valve 33, and the other chemical solution injection port 52b is installed in the gasket 41 between the mounting member 40 and the protective tube 23 or in the vicinity thereof. It is installed so that it opens toward Thus, the chemical | medical solution injection port 52b only for the gasket 41 can be added, and the deposit prevention effect of the deposit to the gasket 41 and its periphery can be improved more. As a result, the safety valve device 30 can be reliably pulled out and removed or reattached for maintenance or repair.

  FIG. 7 shows a configuration example in which one chemical liquid injection pipe 51 is branched and two chemical liquid injection ports 52a and 52b are provided. However, although not shown, two chemical liquid injection pipes are arranged. It is also possible to install the chemical injection ports of the respective chemical injection pipes so as to open toward the safety valve 33 and the vicinity thereof and the gasket 41 and the vicinity thereof. It is also possible to arrange three or more chemical solution injection pipes so that the chemical solution is supplied to a portion where deposits need to be prevented.

  As described above, according to the deposit accumulation preventing device for a safety valve device of the present invention, it is always possible to effectively prevent deposits such as calcium carbonate from being deposited on the safety valve device installed in the protective tube and in the vicinity thereof. Therefore, inconveniences such as malfunction of the safety valve device in an emergency can be avoided, and the safety of the storage tank can be ensured. Therefore, it is possible to prevent various obstacles and dangers that may develop into a major disaster in some cases.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are achieved. For example, in the above-described embodiment, the example in which the deposit accumulation preventing device 50 is installed in the safety valve device 30 attached in the protective tube 23 of the pumped liquid pipe 6 is shown. When a safety valve device is provided in the drain pipe 7 or the gas vent pipe 8 in addition to the pipe 6, it may be installed therein, or a safety valve device is provided in another pipe communicating from the liquid storage tank 1 to the ground. Can be installed in the safety valve device.

It is a figure which shows the structural example of the storage tank (liquid storage tank) provided in the bedrock basement. It is a figure which shows the structural example of the front-end | tip part of a liquid pumping pipe. It is a figure which shows the structural example of the conventional safety valve apparatus. 1A is a schematic side sectional view showing a configuration example of a safety valve device provided with a deposit accumulation preventing apparatus according to an embodiment (Example 1) of the present invention, and FIG. It is the elements on larger scale of injection piping. It is a figure which shows the flow of the specification liquid and chemical | medical solution in a protective tube. It is a figure which shows the structural example of a protection pipe upper end part. It is a figure which shows the structural example of the deposit deposition prevention apparatus concerning the other embodiment example (Example 2) of this invention.

1 Reservoir (Liquid Reservoir)
2 bottom 3 upper opening 4 closing body 5 pumping device 6 pumping tube 7 draining tube 8 venting tube 10 bottom water 11 stored liquid 12 gas 13 interface 20 motor pump 21 pumping unit 22 motor unit 23 protective tube
23a opening
23b body
23c seal part 24 suction pot
24a opening 25 suction port 26 short pipe 27 specification liquid passage 30 safety valve device 31 valve seat 32 valve body 33 safety valve (safety valve body)
34 Valve body seat 35 Valve rod 36 Hydraulic piping 40 Mounting member 41 Gasket 42 Head plate 43 Shut-off valve (emergency shut-off valve)
44 Chemical solution supply device 45 Flange portion 50 Precipitate accumulation prevention device 51 Chemical solution injection pipe 52 Chemical solution injection port 53 Bending portion

Claims (6)

Provided underground, and a liquid storage tank Ca content flows out to the specifications liquid reservoir,
A pumped liquid pipe for liquid being pumped specifications liquid stored in the liquid reservoir,
A safety valve device having a safety valve to block the specification liquid through the該揚liquid pipe in an emergency is installed in該揚liquid pipe, in an underground liquid storage equipment provided with,
A safety valve apparatus precipitate deposition preventing apparatus for precipitates carbonates Improvement of a Saline or the like deposited by Ca content contained in the specification liquid is prevented from depositing on the safety valve device,
The pumping pipe and safety valve device are installed in a protective pipe,
In the protective pipe on the upstream side near the specification liquid suction port of the safety valve device , a chemical liquid injection pipe with an open chemical liquid injection port is installed, and the chemical liquid for preventing the precipitation of the precipitate in the specification liquid is passed through the chemical liquid injection pipe. Configured to inject,
The chemical solution injection port of the chemical solution injection pipe is opened in the vicinity of a gasket portion between an attachment member that attaches a safety valve of the safety valve device to the protection tube and the protection tube. Safety valve device for liquid storage equipment Deposit accumulation prevention device . In the safety valve device deposit accumulation prevention device of the underground liquid storage facility according to claim 1,
  The chemical liquid injection port of the chemical liquid injection pipe is also opened in the vicinity of the valve seat, the valve body seat portion, and the valve stem bearing portion constituting the safety valve of the safety valve device.
A safety valve device deposit prevention device for underground liquid storage equipment. In the safety valve device deposit accumulation prevention device according to claim 1 or 2 ,
A shut-off mechanism is installed in the chemical solution injection pipe , and the shut-off mechanism is operated in conjunction with the closing operation of the safety valve of the safety valve device to block the flow of the chemical solution injection pipe , or the chemical solution injection pipe A safety valve device for depositing deposits in underground liquid storage equipment, wherein a check valve for preventing backflow is provided . A liquid storage tank provided in the basement and from which Ca flows out to the specification liquid to be stored;
A pumping pipe for pumping the specification liquid stored in the liquid storage tank;
In the underground liquid storage facility provided with a safety valve device provided with a safety valve installed in the pumping pipe and having a safety valve that shuts off the specification liquid passing through the pumping pipe in an emergency,
A safety valve device deposit prevention device for preventing deposits such as calcium carbonate precipitated by Ca contained in the specification liquid from depositing on the safety valve device,
The pumping pipe and safety valve device are installed in a protective pipe,
A chemical solution injection pipe with a chemical solution inlet opening is installed in the protective tube on the upstream side near the specification solution suction port of the safety valve device, and a chemical solution for preventing precipitation of the precipitate is injected into the specification solution through the chemical solution injection pipe Configured to
A shut-off mechanism is installed in the chemical solution injection pipe, and the shut-off mechanism is operated in conjunction with the closing operation of the safety valve of the safety valve device to block the flow of the chemical solution injection pipe, or the chemical solution injection pipe A safety valve device for depositing deposits in underground liquid storage equipment, wherein a check valve for preventing backflow is provided . In the safety valve device deposit accumulation prevention device of the underground liquid storage facility according to claim 4 ,
An underground liquid storage facility characterized in that a chemical liquid injection port of the chemical liquid injection pipe is open in the vicinity of a valve seat, a valve body seat portion, and a valve stem bearing portion constituting a safety valve of the safety valve device. Safety valve device Deposit accumulation prevention device.   A liquid storage tank provided in the basement and from which Ca component flows into the stored specification liquid, a pumping pipe for pumping the specification liquid stored in the liquid storage tank, and the pumping liquid installed in the pumping pipe in an emergency And a safety valve device having a safety valve that shuts off the specification liquid passing through the pipe, and deposits such as calcium carbonate deposited by Ca contained in the specification liquid are deposited on the safety valve device. A safety valve device for preventing deposit deposition prevention method,
  A chemical solution for preventing precipitation of the deposit is injected into the specification liquid in the vicinity of the safety valve device in a protective tube in which the liquid pump and the safety valve device are installed, and the specification liquid into which the chemical solution is injected is the safety valve and the pumping fluid. To be pumped through the tube,
  The chemical solution injected into the specification liquid in the protective tube is also distributed in the vicinity of the gasket portion between the protective member and the mounting member that attaches the safety valve of the safety valve device to the protective tube.
A method for preventing deposit accumulation in a safety valve device for an underground liquid storage facility.

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