WO2024100724A1 - Method for blocking end piping, outside air inflow determination method, and piping equipment - Google Patents

Method for blocking end piping, outside air inflow determination method, and piping equipment Download PDF

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WO2024100724A1
WO2024100724A1 PCT/JP2022/041415 JP2022041415W WO2024100724A1 WO 2024100724 A1 WO2024100724 A1 WO 2024100724A1 JP 2022041415 W JP2022041415 W JP 2022041415W WO 2024100724 A1 WO2024100724 A1 WO 2024100724A1
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gate valve
downstream
upstream
end pipe
section
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PCT/JP2022/041415
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French (fr)
Japanese (ja)
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宏之 武田
貴志 下垣
秀太 森島
遼平 藤村
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川崎重工業株式会社
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Priority to PCT/JP2022/041415 priority Critical patent/WO2024100724A1/en
Publication of WO2024100724A1 publication Critical patent/WO2024100724A1/en

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  • This disclosure relates to a method for shutting off an end pipe located at the end of a piping system, a method for determining outside air inflow, and the piping system.
  • Patent Document 1 discloses piping equipment for a gas turbine power generation facility that uses natural gas as fuel.
  • the present disclosure aims to provide a method for shutting off end pipes that can suppress contamination of the internal gas.
  • a method for shutting off an end pipe involves dividing the inside of the end pipe, into which outside air can flow from the downstream end, with a downstream gate valve and an upstream gate valve, to form a downstream compartment located downstream of the downstream gate valve, an intermediate compartment located between the downstream gate valve and the upstream gate valve, and an upstream compartment located upstream of the upstream gate valve, and an intermediate gas, which is the same gas as the internal gas of the upstream compartment, is held in the intermediate compartment at a pressure higher than that of the outside air.
  • This method can prevent internal gas contamination.
  • FIG. 1 is a schematic diagram of the vicinity of an end portion of a piping installation according to a first embodiment.
  • FIG. 2 is a flow diagram of the end pipe blocking method according to the first embodiment.
  • FIG. 3 is a schematic diagram of the vicinity of an end portion of a piping installation according to the second embodiment.
  • FIG. 1 is a schematic diagram of the vicinity of an end of the piping equipment 100 according to the first embodiment.
  • the right side of the paper in FIG. 1 is the upstream side, and the left side of the paper is the downstream side. This is also the same as FIG. 3 described later.
  • the inside of the piping equipment 100 is filled with an internal gas.
  • the internal gas is a high-purity gas, such as hydrogen gas, natural gas, petroleum gas, ammonia gas, etc.
  • the internal gas in this embodiment is hydrogen gas generated by vaporization of liquefied hydrogen, and the temperature of the internal gas is much lower than the outside air temperature. However, the internal gas may be at room temperature.
  • the piping equipment 100 includes an end pipe 10, a downstream gate valve 20, an upstream gate valve 30, a downstream section pressure gauge 40, and an intermediate section pressure gauge 50. Below, these components will be described in order.
  • the end pipe 10 is a pipe located at the downstream end of the pipe equipment 100.
  • the end pipe 10 has a downstream end 11.
  • the downstream end 11 is connected to other equipment depending on the situation, and internal gas is supplied to the other equipment via the downstream end 11.
  • FIG. 1 shows a state in which the downstream end 11 is not connected to other equipment (disconnected state).
  • a plug 12 is attached to the downstream end 11 of the end pipe 10.
  • the plug 12 may not be attached to the downstream end 11, and the downstream end 11 may be open to the outside of the pipe equipment 100.
  • the purity (concentration) of the internal gas will decrease, and the quality of the internal gas will deteriorate.
  • the internal gas if the internal gas is flammable, the internal gas and the outside air will mix together to form an explosive atmosphere, which may ignite the internal gas and cause an explosion.
  • the temperature of the internal gas is very low, the outside air will cool and solidify, which may have an adverse effect on the piping equipment 100 and other equipment connected to the piping equipment 100. For this reason, it is desirable to suppress contamination of the internal gas as much as possible.
  • the downstream gate valve 20 is a valve provided in the end pipe 10.
  • the downstream gate valve 20 may be configured to open and close automatically, or manually, or both.
  • the downstream gate valve 20 is located near the downstream end 11 of the end pipe 10.
  • the section located downstream of the downstream gate valve 20, i.e., the section located between the downstream end 11 and the downstream gate valve 20 is referred to as the "downstream section 91.”
  • typical valves have a forward direction and a reverse direction due to their structure.
  • fluid flowing in the forward direction is less likely to leak than fluid flowing in the reverse direction (i.e., fluid flowing in the forward direction is less likely to pass through the valve).
  • the downstream gate valve 20 is provided in the end pipe 10 so that the direction toward the downstream is the forward direction. Therefore, when the downstream gate valve 20 is fully closed, gas located upstream of the downstream gate valve 20 is less likely to leak downstream of the downstream gate valve 20.
  • the upstream gate valve 30 is a valve provided upstream of the downstream gate valve 20 of the end pipe 10.
  • the upstream gate valve 30 may be configured to open and close automatically, or manually, or both.
  • the section located between the downstream gate valve 20 and the upstream gate valve 30 is referred to as the "middle section 92.”
  • the section located upstream of the upstream gate valve 30 is referred to as the "upstream section 93.”
  • the upstream gate valve 30 is provided in the end pipe 10 so that the direction toward the upstream is the forward direction. Therefore, when the upstream gate valve 30 is in a fully closed state, gas located downstream of the upstream gate valve 30 is unlikely to leak upstream of the upstream gate valve 30.
  • the downstream section pressure gauge 40 is a measuring device that measures the internal pressure of the downstream section 91.
  • the downstream section pressure gauge 40 is provided between the downstream end 11 of the end pipe 10 and the downstream gate valve 20.
  • the intermediate section pressure gauge 50 is a measuring device that measures the internal pressure of the intermediate section 92.
  • the intermediate section pressure gauge 50 is provided between the downstream gate valve 20 and the upstream gate valve 30 of the end piping 10. This concludes the description of the configuration of the piping equipment 100 according to the first embodiment.
  • Fig. 2 is a flow chart of the method for shutting off the end pipe 10 according to this embodiment.
  • a low-temperature intermediate gas is first supplied to the area corresponding to the intermediate section 92 (step S1).
  • the above-mentioned "intermediate gas” is the same gas as the internal gas.
  • the intermediate gas is also hydrogen gas.
  • "low temperature” is a temperature lower than the temperature outside the end pipe 10 (outside air temperature).
  • the hydrogen gas, which is the internal gas is much lower than the outside air temperature. Therefore, by opening the upstream gate valve 30, a low-temperature intermediate gas can be supplied to the area corresponding to the intermediate section 92.
  • a downstream section 91, an intermediate section 92, and an upstream section 93 are formed inside the end piping 10 (step S2).
  • the sections 91, 92, and 93 can be formed by closing the downstream gate valve 20 and the upstream gate valve 30.
  • the low-temperature intermediate gas is sealed in the intermediate section 92.
  • steps S1 and S2 may be reversed. In other words, after forming the sections 91, 92, and 93, the low-temperature intermediate gas may be supplied to the area corresponding to the intermediate section 92.
  • step S3 the pressure of the intermediate gas sealed in the intermediate section 92 is increased (step S3). Specifically, the temperature of the intermediate gas is increased by heat input from outside the end piping 10, and the intermediate gas is placed in a state of higher pressure than the outside air. In step S2, since the temperature of the intermediate gas sealed in the intermediate section 92 is lower than the temperature outside the end piping 10 (outside air temperature), the temperature of the intermediate gas is increased by natural heat input from outside the end piping 10.
  • the portion of the end pipe 10 corresponding to the intermediate section 92 may be configured to transmit heat more easily than other portions.
  • the portion corresponding to the intermediate section 92 may be made into a single-walled pipe.
  • a heating device may be provided outside the end pipe 10, and heat may be input to the intermediate gas using the heating device.
  • the intermediate gas which is the same gas as the internal gas in the upstream section 93, can be held in the intermediate section 92 at a pressure higher than the outside air.
  • the intermediate gas is the same gas as the internal gas, contamination of the internal gas will not occur even if the intermediate gas in the intermediate section 92 mixes with the internal gas.
  • the temperature of the intermediate gas which was at the same temperature as the internal gas, is raised by heat input from outside the end piping 10, thereby increasing the pressure of the intermediate gas. Therefore, the pressure of the intermediate gas in the intermediate section 92 is higher than the pressure of the internal gas in the upstream section 93. Therefore, in this embodiment, the internal gas in the upstream section 93 does not leak into the intermediate section 92, and it is possible to prevent the internal gas from leaking outside the end piping 10.
  • the downstream gate valve 20 is provided in the end pipe 10 so that the direction toward the downstream is the forward direction. Therefore, the intermediate gas in the intermediate section 92 is unlikely to leak into the downstream section 91.
  • the upstream gate valve 30 is provided in the end pipe 10 so that the direction toward the upstream is the forward direction. Therefore, the intermediate gas in the intermediate section 92 is unlikely to leak into the upstream section 93. Therefore, according to this embodiment, it is possible to suppress a decrease in the pressure of the intermediate gas in the intermediate section 92.
  • step S3 the flow of outside air into the intermediate section 92 is monitored (step S4). Specifically, the internal pressures of the downstream section 91 and the intermediate section 92 are obtained from the downstream section pressure gauge 40 and the intermediate section pressure gauge 50, respectively. Then, the internal pressures of the downstream section 91 and the intermediate section 92 are compared, and if the internal pressure of the intermediate section 92 is higher than the internal pressure of the downstream section 91, it is determined that there is no possibility that outside air has flowed into the intermediate section 92.
  • the piping equipment 100 may also be equipped with an alarm device that outputs an alarm signal when the internal pressure of the intermediate section 92 drops and the difference between the internal pressure of the intermediate section 92 and the internal pressure of the downstream section 91 falls below a specified value.
  • a low-temperature intermediate gas is supplied to the area corresponding to the intermediate section 92, and the pressure of the intermediate gas is increased by heat input from outside the end pipe 10.
  • a high-pressure intermediate gas may be supplied to the area corresponding to the intermediate section 92 from the beginning.
  • high-pressure intermediate gas may be supplied from the downstream end 11 of the end pipe 10 to the area corresponding to the intermediate section 92, and then the downstream gate valve 20 may be closed.
  • the intermediate gas is the same gas as the internal gas, and the pressure of the supplied intermediate gas is higher than the pressure of the outside air.
  • the intermediate gas which is the same gas as the internal gas of the upstream section 93, can be held in the intermediate section 92 at a pressure higher than the outside air.
  • Fig. 3 is a schematic diagram of the vicinity of an end portion of a piping equipment 200 according to the second embodiment.
  • the piping equipment 200 according to the second embodiment is different in configuration from the piping equipment 100 according to the first embodiment in that it includes an auxiliary pipe 60 and a check valve 70. In other respects, it has basically the same configuration as the piping equipment 100 according to the first embodiment.
  • the auxiliary pipe 60 in this embodiment is a pipe that connects the intermediate section 92 and the upstream section 93 of the end pipe 10.
  • the check valve 70 is a valve provided in the auxiliary pipe 60.
  • the check valve 70 is configured to allow the flow of fluid from the upstream section 93 to the intermediate section 92, while prohibiting the flow of fluid from the intermediate section 92 to the upstream section 93.
  • the piping equipment 200 since the piping equipment 200 according to this embodiment is configured as described above, when the internal pressure of the intermediate section 92 becomes lower than the internal pressure of the upstream section 93, the internal gas flows into the intermediate section 92 from the upstream section 93. In other words, the intermediate section 92 is automatically replenished with intermediate gas. Therefore, when the pressure of the internal gas is higher than the pressure of the outside air, the intermediate gas can be maintained at a higher pressure than the outside air. As a result, outside air does not flow into the intermediate section 92, and contamination of the internal gas can be suppressed.
  • the first item disclosed in this specification is a method for shutting off an end pipe in a piping facility including an end pipe having a downstream end through which outside air can flow, a downstream gate valve provided on the end pipe, and an upstream gate valve provided upstream of the downstream gate valve of the end pipe, wherein the inside of the end pipe is partitioned with the downstream gate valve and the upstream gate valve to form a downstream compartment located downstream of the downstream gate valve, an intermediate compartment located between the downstream gate valve and the upstream gate valve, and an upstream compartment located upstream of the upstream gate valve, and an intermediate gas, which is the same gas as the internal gas of the upstream compartment, is held in the intermediate compartment at a pressure higher than the outside air.
  • the second item disclosed in this specification is a method for shutting off an end pipe described in the first item, in which the intermediate gas is held in the intermediate section at a pressure higher than that of the internal gas.
  • This method can prevent the internal gas from leaking into the intermediate section, and therefore the internal gas from leaking outside the end piping.
  • the third item disclosed in this specification is a method for shutting off an end pipe described in the first or second item, in which the intermediate gas is supplied to an area corresponding to the intermediate section at a temperature lower than that outside the end pipe, the temperature of the intermediate gas is increased by heat input from outside the end pipe, and the intermediate gas is held in the intermediate section at a pressure higher than that of the outside air.
  • This method allows the intermediate gas in the intermediate section to be at a higher pressure than the outside air.
  • the fourth item disclosed in this specification is a method for shutting off an end pipe described in the first or second item, in which the intermediate gas is supplied to an area corresponding to the intermediate section at a pressure higher than the outside air, and the intermediate gas is held in the intermediate section at a pressure higher than the outside air.
  • This method also allows the intermediate gas in the intermediate section to be at a higher pressure than the outside air.
  • the fifth item disclosed in this specification is an outside air inflow determination method in the end pipe shutoff method described in any one of items 1 to 4, which determines that there is a possibility that the outside air has flowed into the middle section when the internal pressure of the middle section decreases and the internal pressure of the middle section becomes the same as the internal pressure of the outer section.
  • This method makes it easy to determine whether or not outside air may have flowed into the intermediate compartment.
  • the sixth item disclosed in this specification is a piping system comprising an end pipe having a downstream end through which outside air can flow, a downstream gate valve provided in the end pipe, an upstream gate valve provided upstream of the downstream gate valve of the end pipe, a downstream compartment pressure gauge that measures the internal pressure of a downstream compartment located downstream of the downstream gate valve of the end pipe, and an intermediate compartment pressure gauge that measures the internal pressure of an intermediate compartment located between the downstream gate valve and the upstream gate valve of the end pipe.
  • This configuration makes it possible to carry out the end pipe blocking method described in the first item, and also makes it easy to carry out the determination described in the fifth item.
  • the seventh item disclosed in this specification is the piping equipment described in the sixth item, in which the downstream gate valve is provided on the end pipe so that the forward direction is toward the downstream, and the upstream gate valve is provided on the end pipe so that the forward direction is toward the upstream.
  • This configuration makes it possible to prevent the pressure of the intermediate gas in the intermediate section from decreasing.
  • the eighth item disclosed in this specification is a piping system comprising an end pipe having a downstream end into which outside air can flow, a downstream gate valve provided in the end pipe, an upstream gate valve provided in the end pipe upstream of the downstream gate valve, an auxiliary pipe connecting an intermediate compartment located between the downstream gate valve and the upstream gate valve in the end pipe and an upstream compartment located upstream of the upstream gate valve, and a check valve provided in the auxiliary pipe to allow flow from the upstream compartment to the intermediate compartment while prohibiting flow from the intermediate compartment to the upstream compartment.

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Abstract

A method for blocking end piping according to one embodiment of the present disclosure is used in piping equipment (100) including end piping (10) having a downstream end into which outside air can flow, a downstream gate valve (20) provided to the end piping, and an upstream gate valve (30) provided upstream of the downstream gate valve of the end piping. Due to the interior of the end piping being partitioned by the downstream gate valve and the upstream gate valve, a downstream section (91) positioned downstream of the downstream gate valve, an intermediate section (92) positioned between the downstream gate valve and the upstream gate valve, and an upstream section (93) positioned upstream of the upstream gate valve are formed, and an intermediate gas, which is the same gas as an internal gas in the upstream section, is held in the intermediate section while higher in pressure than the outside air.

Description

端部配管の遮断方法、外気流入判定方法、及び配管設備Method for shutting off end piping, method for determining outside air inflow, and piping equipment
　本開示は、配管設備の端部に位置する端部配管の遮断方法、外気流入判定方法、及び配管設備に関する。 This disclosure relates to a method for shutting off an end pipe located at the end of a piping system, a method for determining outside air inflow, and the piping system.
　特許文献１には、天然ガスを燃料とするガスタービン発電設備の配管設備が開示されている。 Patent Document 1 discloses piping equipment for a gas turbine power generation facility that uses natural gas as fuel.
特開２００６－７７６９８号公報JP 2006-77698 A
　配管設備の端部に位置する端部配管では、その下流端から外気が流入し、流入した外気が配管設備内の内部気体に混入して内部気体を汚染するコンタミ（contamination）が発生するおそれがある。そこで、本開示は、内部気体のコンタミを抑制できる端部配管の遮断方法を提供することを目的とする。 In end pipes located at the end of a piping system, outside air flows in from the downstream end, and there is a risk that the outside air may mix with the internal gas in the piping system, causing contamination of the internal gas. Therefore, the present disclosure aims to provide a method for shutting off end pipes that can suppress contamination of the internal gas.
　本開示の一態様に係る端部配管の遮断方法は、下流端から外気が流入しうる端部配管の内部を下流仕切弁及び上流仕切弁で仕切ることで、前記下流仕切弁よりも下流に位置する下流区画、前記下流仕切弁と前記上流仕切弁の間に位置する中間区画、及び、前記上流仕切弁よりも上流に位置する上流区画を形成し、前記上流区画の内部気体と同じ気体である中間気体を、前記外気よりも圧力が高い状態で、前記中間区画において保持する。 In one embodiment of the present disclosure, a method for shutting off an end pipe involves dividing the inside of the end pipe, into which outside air can flow from the downstream end, with a downstream gate valve and an upstream gate valve, to form a downstream compartment located downstream of the downstream gate valve, an intermediate compartment located between the downstream gate valve and the upstream gate valve, and an upstream compartment located upstream of the upstream gate valve, and an intermediate gas, which is the same gas as the internal gas of the upstream compartment, is held in the intermediate compartment at a pressure higher than that of the outside air.
　この方法によれば、内部気体のコンタミを抑制することができる。 This method can prevent internal gas contamination.
図１は、第１実施形態に係る配管設備における端部付近の概略図である。FIG. 1 is a schematic diagram of the vicinity of an end portion of a piping installation according to a first embodiment. 図２は、第１実施形態に係る端部配管の遮断方法のフロー図である。FIG. 2 is a flow diagram of the end pipe blocking method according to the first embodiment. 図３は、第２実施形態に係る配管設備における端部付近の概略図である。FIG. 3 is a schematic diagram of the vicinity of an end portion of a piping installation according to the second embodiment.
　（第１実施形態）
　以下、本開示の第１実施形態を説明する。 First Embodiment
The first embodiment of the present disclosure will be described below.
　＜配管設備の構成＞
　はじめに、第１実施形態に係る配管設備１００の構成について説明する。図１は、第１実施形態に係る配管設備１００における端部付近の概略図である。なお、図１の紙面右側が上流側であり、紙面左側が下流側である。この点は、後述する図３も同じである。配管設備１００の内部は内部気体で満たされている。内部気体は、高純度のガスであって、例えば、水素ガス、天然ガス、石油ガス、アンモニアガス等である。本実施形態の内部気体は、液化水素が気化して発生した水素ガスであって、内部気体の温度は外気温度よりもはるかに低い。ただし、内部気体は常温であってもよい。 <Piping equipment configuration>
First, the configuration of the piping equipment 100 according to the first embodiment will be described. FIG. 1 is a schematic diagram of the vicinity of an end of the piping equipment 100 according to the first embodiment. The right side of the paper in FIG. 1 is the upstream side, and the left side of the paper is the downstream side. This is also the same as FIG. 3 described later. The inside of the piping equipment 100 is filled with an internal gas. The internal gas is a high-purity gas, such as hydrogen gas, natural gas, petroleum gas, ammonia gas, etc. The internal gas in this embodiment is hydrogen gas generated by vaporization of liquefied hydrogen, and the temperature of the internal gas is much lower than the outside air temperature. However, the internal gas may be at room temperature.
　図１に示すように、本実施形態に係る配管設備１００は、端部配管１０と、下流仕切弁２０と、上流仕切弁３０と、下流区画圧力計４０と、中間区画圧力計５０と、を備えている。以下、これらの構成要素について順に説明する。 As shown in FIG. 1, the piping equipment 100 according to this embodiment includes an end pipe 10, a downstream gate valve 20, an upstream gate valve 30, a downstream section pressure gauge 40, and an intermediate section pressure gauge 50. Below, these components will be described in order.
　端部配管１０は、配管設備１００の下流端部に位置する配管である。端部配管１０は下流端１１を有している。本実施形態では状況に応じて下流端１１が他の設備に接続され、下流端１１を介して他の設備に内部気体が供給される。図１は、下流端１１が他の設備に接続されていない状態（非接続状態）を示している。非接続状態では、端部配管１０の下流端１１にはプラグ１２が取り付けられている。ただし、非接続状態において下流端１１にプラグ１２を取り付けず、下流端１１が配管設備１００の外部に開放されていてもよい。 The end pipe 10 is a pipe located at the downstream end of the pipe equipment 100. The end pipe 10 has a downstream end 11. In this embodiment, the downstream end 11 is connected to other equipment depending on the situation, and internal gas is supplied to the other equipment via the downstream end 11. FIG. 1 shows a state in which the downstream end 11 is not connected to other equipment (disconnected state). In the disconnected state, a plug 12 is attached to the downstream end 11 of the end pipe 10. However, in the disconnected state, the plug 12 may not be attached to the downstream end 11, and the downstream end 11 may be open to the outside of the pipe equipment 100.
　下流端１１が配管設備１００の外部に開放されている場合は、外気が端部配管１０に流入しうる。また、下流端１１にプラグ１２が取り付けられていたとしても、端部配管１０の内部と外部の圧力差によっては、外気がプラグ１２を通過して端部配管１０の内部に流入するおそれがある。特に、端部配管１０の外径が大きい場合には、下流端１１にプラグ１２が取り付けられていたとしても、外気が端部配管１０の内部に流入するリスクが高まる。 When the downstream end 11 is open to the outside of the piping equipment 100, outside air may flow into the end pipe 10. Even if a plug 12 is attached to the downstream end 11, outside air may pass through the plug 12 and flow into the inside of the end pipe 10 depending on the pressure difference between the inside and outside of the end pipe 10. In particular, when the outer diameter of the end pipe 10 is large, there is an increased risk of outside air flowing into the inside of the end pipe 10, even if a plug 12 is attached to the downstream end 11.
　仮に、端部配管１０の内部に流入した外気が内部気体に混入してコンタミが発生した場合、例えば、内部気体の純度(濃度)が低下し、内部気体の品質が低下する。また、内部気体が可燃性の場合には、内部気体と外気が混ざり合うことで爆発雰囲気が形成され、内部気体に着火して爆発が発生するおそれもある。さらに、内部気体の温度が非常に低ければ、外気が冷却されて固体化し、配管設備１００や配管設備１００に接続された他の設備に悪影響を及ぼすおそれがある。そのため、内部気体のコンタミを可能な限り抑制することが望ましい。 If the outside air that has flowed into the end piping 10 mixes with the internal gas and contamination occurs, for example, the purity (concentration) of the internal gas will decrease, and the quality of the internal gas will deteriorate. Also, if the internal gas is flammable, the internal gas and the outside air will mix together to form an explosive atmosphere, which may ignite the internal gas and cause an explosion. Furthermore, if the temperature of the internal gas is very low, the outside air will cool and solidify, which may have an adverse effect on the piping equipment 100 and other equipment connected to the piping equipment 100. For this reason, it is desirable to suppress contamination of the internal gas as much as possible.
　下流仕切弁２０は、端部配管１０に設けられた弁である。下流仕切弁２０は、自動で開閉するように構成されていてもよく、手動で開閉するように構成されていてもよく、その両方であってもよい。本実施形態の下流仕切弁２０は、端部配管１０の下流端１１近傍に位置している。なお、以下では、端部配管１０の内部を下流仕切弁２０で仕切ったとき、下流仕切弁２０よりも下流に位置する区画、つまり下流端１１と下流仕切弁２０の間に位置する区画を「下流区画９１」と称する。 The downstream gate valve 20 is a valve provided in the end pipe 10. The downstream gate valve 20 may be configured to open and close automatically, or manually, or both. In this embodiment, the downstream gate valve 20 is located near the downstream end 11 of the end pipe 10. In the following, when the inside of the end pipe 10 is partitioned off by the downstream gate valve 20, the section located downstream of the downstream gate valve 20, i.e., the section located between the downstream end 11 and the downstream gate valve 20, is referred to as the "downstream section 91."
　ここで、一般的な弁には、構造上、順方向と逆方向が存在する。弁が全閉状態にあるとき、順方向に流れようとする流体は逆方向に流れようとする流体に比べて漏れにくい（つまり、順方向に流れようとする流体は弁を通過しにくい）。本実施形態では、下流仕切弁２０は下流に向かう方向が順方向となるように、端部配管１０に設けられている。そのため、下流仕切弁２０が全閉状態にあるとき、下流仕切弁２０よりも上流に位置する気体は下流仕切弁２０よりも下流に漏れにくい。 Here, typical valves have a forward direction and a reverse direction due to their structure. When the valve is fully closed, fluid flowing in the forward direction is less likely to leak than fluid flowing in the reverse direction (i.e., fluid flowing in the forward direction is less likely to pass through the valve). In this embodiment, the downstream gate valve 20 is provided in the end pipe 10 so that the direction toward the downstream is the forward direction. Therefore, when the downstream gate valve 20 is fully closed, gas located upstream of the downstream gate valve 20 is less likely to leak downstream of the downstream gate valve 20.
　上流仕切弁３０は、端部配管１０の下流仕切弁２０よりも上流に設けられた弁である。上流仕切弁３０は、自動で開閉するように構成されていてもよく、手動で開閉するように構成されていてもよく、その両方であってもよい。なお、以下では、端部配管１０の内部を下流仕切弁２０及び上流仕切弁３０で仕切ったとき、下流仕切弁２０と上流仕切弁３０の間に位置する区画を「中間区画９２」と称する。さらに、上流仕切弁３０よりも上流に位置する区画を「上流区画９３」と称する。 The upstream gate valve 30 is a valve provided upstream of the downstream gate valve 20 of the end pipe 10. The upstream gate valve 30 may be configured to open and close automatically, or manually, or both. In the following, when the inside of the end pipe 10 is partitioned by the downstream gate valve 20 and the upstream gate valve 30, the section located between the downstream gate valve 20 and the upstream gate valve 30 is referred to as the "middle section 92." Furthermore, the section located upstream of the upstream gate valve 30 is referred to as the "upstream section 93."
　また、本実施形態では、上流仕切弁３０は上流に向かう方向が順方向となるように、端部配管１０に設けられている。そのため、上流仕切弁３０が全閉状態にあるとき、上流仕切弁３０よりも下流に位置する気体は上流仕切弁３０よりも上流に漏れにくい。 In addition, in this embodiment, the upstream gate valve 30 is provided in the end pipe 10 so that the direction toward the upstream is the forward direction. Therefore, when the upstream gate valve 30 is in a fully closed state, gas located downstream of the upstream gate valve 30 is unlikely to leak upstream of the upstream gate valve 30.
　下流区画圧力計４０は、下流区画９１の内部圧力を測定する測定機器である。本実施形態の下流区画圧力計４０は、端部配管１０の下流端１１と下流仕切弁２０の間に設けられている。 The downstream section pressure gauge 40 is a measuring device that measures the internal pressure of the downstream section 91. In this embodiment, the downstream section pressure gauge 40 is provided between the downstream end 11 of the end pipe 10 and the downstream gate valve 20.
　中間区画圧力計５０は、中間区画９２の内部圧力を測定する測定機器である。本実施形態の中間区画圧力計５０は、端部配管１０の下流仕切弁２０と上流仕切弁３０の間に設けられている。以上が、第１実施形態に係る配管設備１００の構成の説明である。 The intermediate section pressure gauge 50 is a measuring device that measures the internal pressure of the intermediate section 92. In this embodiment, the intermediate section pressure gauge 50 is provided between the downstream gate valve 20 and the upstream gate valve 30 of the end piping 10. This concludes the description of the configuration of the piping equipment 100 according to the first embodiment.
　＜端部配管の遮断方法＞
　次に、端部配管１０の遮断方法について説明する。図２は、本実施形態に係る端部配管１０の遮断方法のフロー図である。 <How to shut off end piping>
Next, a description will be given of a method for shutting off the end pipe 10. Fig. 2 is a flow chart of the method for shutting off the end pipe 10 according to this embodiment.
　図２に示すように、端部配管１０の遮断方法では、はじめに中間区画９２に相当するエリアに低温の中間気体を供給する（ステップＳ１）。上記の「中間気体」は内部気体と同じ気体である。本実施形態では、内部気体が水素ガスであるため、中間気体も水素ガスとなる。また、「低温」は、端部配管１０の外部の温度（外気温度）よりも低い温度である。本実施形態では、内部気体である水素ガスは外気温度よりもはるかに低い。そのため、上流仕切弁３０を開くことで、中間区画９２に相当するエリアに低温の中間気体を供給することができる。 As shown in FIG. 2, in the method for shutting off the end pipe 10, a low-temperature intermediate gas is first supplied to the area corresponding to the intermediate section 92 (step S1). The above-mentioned "intermediate gas" is the same gas as the internal gas. In this embodiment, since the internal gas is hydrogen gas, the intermediate gas is also hydrogen gas. Furthermore, "low temperature" is a temperature lower than the temperature outside the end pipe 10 (outside air temperature). In this embodiment, the hydrogen gas, which is the internal gas, is much lower than the outside air temperature. Therefore, by opening the upstream gate valve 30, a low-temperature intermediate gas can be supplied to the area corresponding to the intermediate section 92.
　続いて、ステップＳ１を実施した後は、端部配管１０の内部に下流区画９１、中間区画９２、及び、上流区画９３を形成する（ステップＳ２）。本実施形態では、下流仕切弁２０及び上流仕切弁３０を閉じることで、各区画９１、９２、９３を形成することができる。このステップＳ２を実施することにより、低温の中間気体が中間区画９２に封入されることになる。なお、ステップＳ１とステップＳ２は順番が逆であってもよい。つまり、各区画９１、９２、９３を形成した後に、中間区画９２に相当するエリアに低温の中間気体を供給してもよい。 Subsequently, after performing step S1, a downstream section 91, an intermediate section 92, and an upstream section 93 are formed inside the end piping 10 (step S2). In this embodiment, the sections 91, 92, and 93 can be formed by closing the downstream gate valve 20 and the upstream gate valve 30. By performing this step S2, the low-temperature intermediate gas is sealed in the intermediate section 92. Note that the order of steps S1 and S2 may be reversed. In other words, after forming the sections 91, 92, and 93, the low-temperature intermediate gas may be supplied to the area corresponding to the intermediate section 92.
　続いて、ステップＳ２を実施した後は、中間区画９２に封入された中間気体の圧力を上昇させる（ステップＳ３）。具体的には、端部配管１０の外部からの入熱によって中間気体の温度を上昇させ、中間気体を外気よりも圧力が高い状態とする。ステップＳ２において、中間区画９２に封入された中間気体の温度は、端部配管１０の外部の温度（外気温度）よりも低いため、端部配管１０の外部からの自然入熱によって中間気体の温度は上昇する。 Subsequently, after step S2 is performed, the pressure of the intermediate gas sealed in the intermediate section 92 is increased (step S3). Specifically, the temperature of the intermediate gas is increased by heat input from outside the end piping 10, and the intermediate gas is placed in a state of higher pressure than the outside air. In step S2, since the temperature of the intermediate gas sealed in the intermediate section 92 is lower than the temperature outside the end piping 10 (outside air temperature), the temperature of the intermediate gas is increased by natural heat input from outside the end piping 10.
　なお、端部配管１０の外部から入熱しやすいように、端部配管１０の中間区画９２に対応する部分を他の部分よりも熱が伝わりやすいように構成してもよい。例えば、他の部分が二重管である場合に、中間区画９２に対応する部分を一重管にするなどしてもよい。さらに、端部配管１０の外部に加熱機器を設け、加熱機器を用いて中間気体に入熱してもよい。 In addition, to facilitate heat input from outside the end pipe 10, the portion of the end pipe 10 corresponding to the intermediate section 92 may be configured to transmit heat more easily than other portions. For example, if the other portions are double-walled pipes, the portion corresponding to the intermediate section 92 may be made into a single-walled pipe. Furthermore, a heating device may be provided outside the end pipe 10, and heat may be input to the intermediate gas using the heating device.
　以上のステップにより、上流区画９３の内部気体と同じ気体である中間気体を、外気よりも圧力が高い状態で、中間区画９２において保持することができる。これにより、外気が下流区画９１に流入したとしても、中間区画９２に流入することはできず、ましてや上流区画９３に流入することはない。そのため、外気による内部気体のコンタミを抑制することができる。なお、本実施形態では、中間気体が内部気体と同じ気体であるため、仮に中間区画９２内の中間気体が内部気体に混入したとしても内部気体のコンタミは発生しない。 By the above steps, the intermediate gas, which is the same gas as the internal gas in the upstream section 93, can be held in the intermediate section 92 at a pressure higher than the outside air. As a result, even if the outside air flows into the downstream section 91, it cannot flow into the intermediate section 92, much less into the upstream section 93. This makes it possible to suppress contamination of the internal gas with the outside air. Note that in this embodiment, since the intermediate gas is the same gas as the internal gas, contamination of the internal gas will not occur even if the intermediate gas in the intermediate section 92 mixes with the internal gas.
　また、上記のとおり本実施形態では、端部配管１０の外部からの入熱によって、内部気体と同じ温度であった中間気体の温度を上昇させることで、中間気体の圧力を上昇させている。そのため、中間区画９２の中間気体の圧力は、上流区画９３の内部気体の圧力よりも高くなる。したがって、本実施形態では、上流区画９３の内部気体が中間区画９２に漏れることはなく、内部気体が端部配管１０の外部へ漏れるのを防ぐことができる。 As described above, in this embodiment, the temperature of the intermediate gas, which was at the same temperature as the internal gas, is raised by heat input from outside the end piping 10, thereby increasing the pressure of the intermediate gas. Therefore, the pressure of the intermediate gas in the intermediate section 92 is higher than the pressure of the internal gas in the upstream section 93. Therefore, in this embodiment, the internal gas in the upstream section 93 does not leak into the intermediate section 92, and it is possible to prevent the internal gas from leaking outside the end piping 10.
　さらに、本実施形態では、下流仕切弁２０は下流に向かう方向が順方向となるように、端部配管１０に設けられている。そのため、中間区画９２の中間気体は下流区画９１に漏れにくい。同様に、上流仕切弁３０は上流に向かう方向が順方向となるように、端部配管１０に設けられている。そのため、中間区画９２の中間気体は上流区画９３に漏れにくい。したがって、本実施形態によれば、中間区画９２における中間気体の圧力が低下するのを抑制することができる。 Furthermore, in this embodiment, the downstream gate valve 20 is provided in the end pipe 10 so that the direction toward the downstream is the forward direction. Therefore, the intermediate gas in the intermediate section 92 is unlikely to leak into the downstream section 91. Similarly, the upstream gate valve 30 is provided in the end pipe 10 so that the direction toward the upstream is the forward direction. Therefore, the intermediate gas in the intermediate section 92 is unlikely to leak into the upstream section 93. Therefore, according to this embodiment, it is possible to suppress a decrease in the pressure of the intermediate gas in the intermediate section 92.
　ただし、ある程度時間が経つと、中間区画９２における中間気体の圧力が低下し、外気が中間区画９２に流入するおそれがある。そこで、本実施形態では、ステップＳ３を実施した後、外気の中間区画９２への流入を監視する（ステップＳ４）。具体的には、下流区画圧力計４０及び中間区画圧力計５０から、それぞれ下流区画９１の内部圧力及び中間区画９２の内部圧力を取得する。そのうえで、下流区画９１の内部圧力と中間区画９２の内部圧力を比較して、中間区画９２の内部圧力が下流区画９１の内部圧力よりも高いときは、外気が中間区画９２に流入した可能性が無いと判定する。一方、中間区画９２の内部圧力が低下し、中間区画９２の内部圧力と下流区画９１の内部圧力が同じになったとき、外気が中間区画９２に流入した可能性があると判定する。 However, after a certain amount of time has passed, the pressure of the intermediate gas in the intermediate section 92 may decrease, and outside air may flow into the intermediate section 92. Therefore, in this embodiment, after performing step S3, the flow of outside air into the intermediate section 92 is monitored (step S4). Specifically, the internal pressures of the downstream section 91 and the intermediate section 92 are obtained from the downstream section pressure gauge 40 and the intermediate section pressure gauge 50, respectively. Then, the internal pressures of the downstream section 91 and the intermediate section 92 are compared, and if the internal pressure of the intermediate section 92 is higher than the internal pressure of the downstream section 91, it is determined that there is no possibility that outside air has flowed into the intermediate section 92. On the other hand, when the internal pressure of the intermediate section 92 decreases and the internal pressure of the intermediate section 92 becomes the same as the internal pressure of the downstream section 91, it is determined that there is a possibility that outside air has flowed into the intermediate section 92.
　なお、中間区画９２の内部圧力が低下し、中間区画９２の内部圧力と下流区画９１の内部圧力との差が規定値以下となったとき、上流仕切弁３０を開いて中間区画９２に低温の内部気体を供給して、中間気体を補充するのが望ましい。これにより、中間区画９２の内部圧力（中間気体の圧力）が再度上昇し、ひいては外気が中間区画９２に流入するのを防ぐことができる。また、配管設備１００は、中間区画９２の内部圧力が低下し、中間区画９２の内部圧力と下流区画９１の内部圧力との差が規定値以下となったとき、報知信号を出力する報知機器を備えていてもよい。 When the internal pressure of the intermediate section 92 drops and the difference between the internal pressure of the intermediate section 92 and the internal pressure of the downstream section 91 falls below a specified value, it is desirable to open the upstream gate valve 30 and supply low-temperature internal gas to the intermediate section 92 to replenish the intermediate gas. This prevents the internal pressure of the intermediate section 92 (pressure of the intermediate gas) from rising again, and thus prevents outside air from flowing into the intermediate section 92. The piping equipment 100 may also be equipped with an alarm device that outputs an alarm signal when the internal pressure of the intermediate section 92 drops and the difference between the internal pressure of the intermediate section 92 and the internal pressure of the downstream section 91 falls below a specified value.
　＜変形例＞
　上述した端部配管１０の遮断方法では、中間区画９２に相当するエリアに低温の中間気体を供給し、端部配管１０の外部からの入熱によって中間気体の圧力を上昇させている。ただし、上述した端部配管１０の遮断方法とは異なり、はじめから中間区画９２に相当するエリアに高圧の中間気体を供給してもよい。 <Modification>
In the above-described method for shutting off the end pipe 10, a low-temperature intermediate gas is supplied to the area corresponding to the intermediate section 92, and the pressure of the intermediate gas is increased by heat input from outside the end pipe 10. However, unlike the above-described method for shutting off the end pipe 10, a high-pressure intermediate gas may be supplied to the area corresponding to the intermediate section 92 from the beginning.
　具体的には、上流仕切弁３０を閉じるとともに、下流仕切弁２０を開けた状態で、端部配管１０の下流端１１から高圧の中間気体を中間区画９２に相当するエリアに供給し、その後、下流仕切弁２０を閉じてもよい。ただし、中間気体は内部気体と同じ気体であって、供給する中間気体の圧力は外気の圧力よりも高いものとする。この方法であっても、上流区画９３の内部気体と同じ気体である中間気体を、外気よりも圧力が高い状態で、中間区画９２において保持することができる。しかも、中間区画９２に相当するエリアに低温の中間気体を供給する等の必要もない。 Specifically, with the upstream gate valve 30 closed and the downstream gate valve 20 open, high-pressure intermediate gas may be supplied from the downstream end 11 of the end pipe 10 to the area corresponding to the intermediate section 92, and then the downstream gate valve 20 may be closed. However, the intermediate gas is the same gas as the internal gas, and the pressure of the supplied intermediate gas is higher than the pressure of the outside air. Even with this method, the intermediate gas, which is the same gas as the internal gas of the upstream section 93, can be held in the intermediate section 92 at a pressure higher than the outside air. Moreover, there is no need to supply a low-temperature intermediate gas to the area corresponding to the intermediate section 92.
　（第２実施形態）
　次に、本開示の第２実施形態を説明する。図３は、第２実施形態に係る配管設備２００における端部付近の概略図である。図３に示すように、第２実施形態に係る配管設備２００は、補助配管６０と、逆止弁７０とを備えている点で、第１実施形態に係る配管設備１００と構成が異なる。それ以外の点は、第１実施形態に係る配管設備１００と基本的に同じ構成を備えている。 Second Embodiment
Next, a second embodiment of the present disclosure will be described. Fig. 3 is a schematic diagram of the vicinity of an end portion of a piping equipment 200 according to the second embodiment. As shown in Fig. 3, the piping equipment 200 according to the second embodiment is different in configuration from the piping equipment 100 according to the first embodiment in that it includes an auxiliary pipe 60 and a check valve 70. In other respects, it has basically the same configuration as the piping equipment 100 according to the first embodiment.
　本実施形態の補助配管６０は、端部配管１０の中間区画９２と上流区画９３をつなぐ配管である。また、逆止弁７０は、補助配管６０に設けられた弁である。逆止弁７０は、上流区画９３から中間区画９２への流体の流れを許容する一方、中間区画９２から上流区画９３への流体の流れを禁止するように構成されている。 The auxiliary pipe 60 in this embodiment is a pipe that connects the intermediate section 92 and the upstream section 93 of the end pipe 10. The check valve 70 is a valve provided in the auxiliary pipe 60. The check valve 70 is configured to allow the flow of fluid from the upstream section 93 to the intermediate section 92, while prohibiting the flow of fluid from the intermediate section 92 to the upstream section 93.
　本実施形態に係る配管設備２００は、上記のように構成されているため、中間区画９２の内部圧力が上流区画９３の内部圧力よりも低くなったとき、上流区画９３から内部気体が中間区画９２に流入することになる。つまり、中間区画９２に中間気体が自動的に補充される。そのため、内部気体の圧力が外気の圧力よりも高い場合、中間気体が外気よりも圧力が高い状態を維持することができる。その結果、外気が中間区画９２に流入することはなく、内部気体のコンタミを抑制することができる。 Since the piping equipment 200 according to this embodiment is configured as described above, when the internal pressure of the intermediate section 92 becomes lower than the internal pressure of the upstream section 93, the internal gas flows into the intermediate section 92 from the upstream section 93. In other words, the intermediate section 92 is automatically replenished with intermediate gas. Therefore, when the pressure of the internal gas is higher than the pressure of the outside air, the intermediate gas can be maintained at a higher pressure than the outside air. As a result, outside air does not flow into the intermediate section 92, and contamination of the internal gas can be suppressed.
　＜まとめ＞
　本明細書で開示する第１の項目は、外気が流入しうる下流端を有する端部配管と、前記端部配管に設けられた下流仕切弁と、前記端部配管の前記下流仕切弁よりも上流に設けられた上流仕切弁と、を備えた配管設備における、端部配管の遮断方法であって、前記端部配管の内部を前記下流仕切弁及び前記上流仕切弁で仕切ることで、前記下流仕切弁よりも下流に位置する下流区画、前記下流仕切弁と前記上流仕切弁の間に位置する中間区画、及び、前記上流仕切弁よりも上流に位置する上流区画を形成し、前記上流区画の内部気体と同じ気体である中間気体を、前記外気よりも圧力が高い状態で、前記中間区画において保持する、端部配管の遮断方法である。 <Summary>
The first item disclosed in this specification is a method for shutting off an end pipe in a piping facility including an end pipe having a downstream end through which outside air can flow, a downstream gate valve provided on the end pipe, and an upstream gate valve provided upstream of the downstream gate valve of the end pipe, wherein the inside of the end pipe is partitioned with the downstream gate valve and the upstream gate valve to form a downstream compartment located downstream of the downstream gate valve, an intermediate compartment located between the downstream gate valve and the upstream gate valve, and an upstream compartment located upstream of the upstream gate valve, and an intermediate gas, which is the same gas as the internal gas of the upstream compartment, is held in the intermediate compartment at a pressure higher than the outside air.
　この方法によれば、外気が下流区画に流入したとしても、中間区画に流入することはできず、ましてや上流区画に流入することはない。そのため、内部気体のコンタミを抑制することができる。 With this method, even if outside air flows into the downstream section, it cannot flow into the middle section, much less into the upstream section. This prevents contamination of the internal gas.
　本明細書で開示する第２の項目は、前記中間気体を前記内部気体よりも圧力が高い状態で前記中間区画において保持する、第１の項目に記載の端部配管の遮断方法である。 The second item disclosed in this specification is a method for shutting off an end pipe described in the first item, in which the intermediate gas is held in the intermediate section at a pressure higher than that of the internal gas.
　この方法によれば、内部気体が中間区画に漏れるのを防ぐことができ、ひいては端部配管の外部へ内部気体が漏れるのを防ぐことができる。 This method can prevent the internal gas from leaking into the intermediate section, and therefore the internal gas from leaking outside the end piping.
　本明細書で開示する第３の項目は、前記中間気体を前記端部配管の外部よりも温度の低い状態で前記中間区画に相当するエリアに供給し、前記端部配管の外部からの入熱によって前記中間気体の温度を上昇させ、前記中間気体を前記外気よりも圧力が高い状態で前記中間区画において保持する、第１又は２の項目に記載の端部配管の遮断方法である。 The third item disclosed in this specification is a method for shutting off an end pipe described in the first or second item, in which the intermediate gas is supplied to an area corresponding to the intermediate section at a temperature lower than that outside the end pipe, the temperature of the intermediate gas is increased by heat input from outside the end pipe, and the intermediate gas is held in the intermediate section at a pressure higher than that of the outside air.
　この方法によれば、中間区画における中間気体を外気よりも圧力が高い状態にすることができる。 This method allows the intermediate gas in the intermediate section to be at a higher pressure than the outside air.
　本明細書で開示する第４の項目は、前記中間気体を前記外気よりも圧力が高い状態で前記中間区画に相当するエリアに供給し、前記中間気体を前記外気よりも圧力が高い状態で前記中間区画において保持する、第１又は２の項目に記載の端部配管の遮断方法である。 The fourth item disclosed in this specification is a method for shutting off an end pipe described in the first or second item, in which the intermediate gas is supplied to an area corresponding to the intermediate section at a pressure higher than the outside air, and the intermediate gas is held in the intermediate section at a pressure higher than the outside air.
　この方法であっても、中間区画における中間気体を外気よりも圧力が高い状態にすることができる。 This method also allows the intermediate gas in the intermediate section to be at a higher pressure than the outside air.
　本明細書で開示する第５の項目は、第１乃至４の項目のうち一の項目に記載の端部配管の遮断方法において、前記中間区画の内部圧力が低下し、前記中間区画の内部圧力と前記外部区画の内部圧力とが同じになったとき、前記外気が前記中間区画に流入した可能性があると判定する、外気流入判定方法である。 The fifth item disclosed in this specification is an outside air inflow determination method in the end pipe shutoff method described in any one of items 1 to 4, which determines that there is a possibility that the outside air has flowed into the middle section when the internal pressure of the middle section decreases and the internal pressure of the middle section becomes the same as the internal pressure of the outer section.
　この方法によれば、外気が中間区画に流入した可能性があるか否かを容易に判定することができる。 This method makes it easy to determine whether or not outside air may have flowed into the intermediate compartment.
　本明細書で開示する第６の項目は、外気が流入しうる下流端を有する端部配管と、前記端部配管に設けられた下流仕切弁と、前記端部配管の前記下流仕切弁よりも上流に設けられた上流仕切弁と、前記端部配管の前記下流仕切弁よりも下流に位置する下流区画の内部圧力を測定する下流区画圧力計と、前記端部配管の前記下流仕切弁と前記上流仕切弁の間に位置する中間区画の内部圧力を測定する中間区画圧力計と、を備えている、配管設備である。 The sixth item disclosed in this specification is a piping system comprising an end pipe having a downstream end through which outside air can flow, a downstream gate valve provided in the end pipe, an upstream gate valve provided upstream of the downstream gate valve of the end pipe, a downstream compartment pressure gauge that measures the internal pressure of a downstream compartment located downstream of the downstream gate valve of the end pipe, and an intermediate compartment pressure gauge that measures the internal pressure of an intermediate compartment located between the downstream gate valve and the upstream gate valve of the end pipe.
　この構成によれば、第１の項目に記載の端部配管の遮断方法を実施できるとともに、第５の項目に記載の判定も容易に実施することができる。 This configuration makes it possible to carry out the end pipe blocking method described in the first item, and also makes it easy to carry out the determination described in the fifth item.
　本明細書で開示する第７の項目は、前記下流仕切弁は下流に向かう方向が順方向となるように前記端部配管に設けられており、前記上流仕切弁は上流に向かう方向が順方向となるように前記端部配管に設けられている、第６の項目に記載の配管設備である。 The seventh item disclosed in this specification is the piping equipment described in the sixth item, in which the downstream gate valve is provided on the end pipe so that the forward direction is toward the downstream, and the upstream gate valve is provided on the end pipe so that the forward direction is toward the upstream.
　この構成によれば、中間区画における中間気体の圧力が低下するのを抑制することができる。 This configuration makes it possible to prevent the pressure of the intermediate gas in the intermediate section from decreasing.
　本明細書で開示する第８の項目は、外気が流入しうる下流端を有する端部配管と、前記端部配管に設けられた下流仕切弁と、前記端部配管の前記下流仕切弁よりも上流に設けられた上流仕切弁と、前記端部配管の前記下流仕切弁と前記上流仕切弁の間に位置する中間区画と前記上流仕切弁よりも上流に位置する上流区画とをつなぐ補助配管と、前記補助配管に設けられ、前記上流区画から前記中間区画への流れを許容する一方、前記中間区画から前記上流区画への流れを禁止する逆止弁と、を備えている、配管設備である。 The eighth item disclosed in this specification is a piping system comprising an end pipe having a downstream end into which outside air can flow, a downstream gate valve provided in the end pipe, an upstream gate valve provided in the end pipe upstream of the downstream gate valve, an auxiliary pipe connecting an intermediate compartment located between the downstream gate valve and the upstream gate valve in the end pipe and an upstream compartment located upstream of the upstream gate valve, and a check valve provided in the auxiliary pipe to allow flow from the upstream compartment to the intermediate compartment while prohibiting flow from the intermediate compartment to the upstream compartment.
　この構成によれば、中間区画の内部圧力が上流区画の内部圧力よりも低くなったとき、上流区画から内部気体が中間区画に自動的に補充される。そのため、内部区画における内部気体の圧力が高い状態を維持できる。 With this configuration, when the internal pressure of the intermediate compartment becomes lower than the internal pressure of the upstream compartment, the internal gas is automatically replenished from the upstream compartment to the intermediate compartment. This allows the internal gas pressure in the internal compartment to be maintained at a high level.
１０　端部配管
１１　下流端
１２　プラグ
２０　下流仕切弁
３０　上流仕切弁
４０　下流区画圧力計
５０　中間区画圧力計
６０　補助配管
７０　逆止弁
９１　下流区画
９２　中間区画
９３　上流区画
１００　配管設備
２００　配管設備
  10 End pipe 11 Downstream end 12 Plug 20 Downstream gate valve 30 Upstream gate valve 40 Downstream section pressure gauge 50 Middle section pressure gauge 60 Auxiliary pipe 70 Check valve 91 Downstream section 92 Middle section 93 Upstream section 100 Piping equipment 200 Piping equipment

Claims (8)

  1. 　外気が流入しうる下流端を有する端部配管と、
    　前記端部配管に設けられた下流仕切弁と、
    　前記端部配管の前記下流仕切弁よりも上流に設けられた上流仕切弁と、を備えた配管設備における、端部配管の遮断方法であって、
    　前記端部配管の内部を前記下流仕切弁及び前記上流仕切弁で仕切ることで、前記下流仕切弁よりも下流に位置する下流区画、前記下流仕切弁と前記上流仕切弁の間に位置する中間区画、及び、前記上流仕切弁よりも上流に位置する上流区画を形成し、
    　前記上流区画の内部気体と同じ気体である中間気体を、前記外気よりも圧力が高い状態で、前記中間区画において保持する、端部配管の遮断方法。     an end pipe having a downstream end through which outside air can flow;
    A downstream gate valve provided in the end pipe;
    An upstream gate valve provided upstream of the downstream gate valve of the end pipe,
    The inside of the end pipe is partitioned by the downstream gate valve and the upstream gate valve to form a downstream section located downstream of the downstream gate valve, an intermediate section located between the downstream gate valve and the upstream gate valve, and an upstream section located upstream of the upstream gate valve,
    A method for isolating an end pipe, comprising: holding an intermediate gas, which is the same gas as the internal gas of the upstream section, in the intermediate section at a pressure higher than that of the outside air.
  2. 　前記中間気体を前記内部気体よりも圧力が高い状態で前記中間区画において保持する、請求項１に記載の端部配管の遮断方法。 The method for shutting off an end pipe according to claim 1, wherein the intermediate gas is held in the intermediate section at a pressure higher than that of the internal gas.
  3. 　前記中間気体を前記端部配管の外部よりも温度の低い状態で前記中間区画に相当するエリアに供給し、前記端部配管の外部からの入熱によって前記中間気体の温度を上昇させ、前記中間気体を前記外気よりも圧力が高い状態で前記中間区画において保持する、請求項１に記載の端部配管の遮断方法。 The method for shutting off an end pipe according to claim 1, wherein the intermediate gas is supplied to an area corresponding to the intermediate section at a temperature lower than that outside the end pipe, the temperature of the intermediate gas is increased by heat input from outside the end pipe, and the intermediate gas is held in the intermediate section at a pressure higher than that of the outside air.
  4. 　前記中間気体を前記外気よりも圧力が高い状態で前記中間区画に相当するエリアに供給し、前記中間気体を前記外気よりも圧力が高い状態で前記中間区画において保持する、請求項１に記載の端部配管の遮断方法。 The method for shutting off an end pipe according to claim 1, wherein the intermediate gas is supplied to an area corresponding to the intermediate section at a pressure higher than the outside air, and the intermediate gas is held in the intermediate section at a pressure higher than the outside air.
  5. 　請求項１に記載の端部配管の遮断方法において、前記中間区画の内部圧力が低下し、前記中間区画の内部圧力と前記外部区画の内部圧力とが同じになったとき、前記外気が前記中間区画に流入した可能性があると判定する、外気流入判定方法。 In the method for shutting off an end pipe as described in claim 1, an outside air inflow determination method is provided, which determines that there is a possibility that the outside air has flowed into the middle section when the internal pressure of the middle section decreases and the internal pressure of the middle section becomes the same as the internal pressure of the outer section.
  6. 　外気が流入しうる下流端を有する端部配管と、
    　前記端部配管に設けられた下流仕切弁と、
    　前記端部配管の前記下流仕切弁よりも上流に設けられた上流仕切弁と、
    　前記端部配管の前記下流仕切弁よりも下流に位置する下流区画の内部圧力を測定する下流区画圧力計と、
    　前記端部配管の前記下流仕切弁と前記上流仕切弁の間に位置する中間区画の内部圧力を測定する中間区画圧力計と、を備えている配管設備。     an end pipe having a downstream end through which outside air can flow;
    A downstream gate valve provided in the end pipe;
    an upstream gate valve provided upstream of the downstream gate valve of the end pipe;
    a downstream section pressure gauge for measuring an internal pressure of a downstream section located downstream of the downstream gate valve of the end pipe;
    and an intermediate section pressure gauge for measuring the internal pressure of an intermediate section located between the downstream gate valve and the upstream gate valve of the end piping.
  7. 前記下流仕切弁は下流に向かう方向が順方向となるように前記端部配管に設けられており、前記上流仕切弁は上流に向かう方向が順方向となるように前記端部配管に設けられている、請求項６に記載の配管設備。 The piping equipment according to claim 6, wherein the downstream gate valve is provided on the end pipe so that the forward direction is toward the downstream, and the upstream gate valve is provided on the end pipe so that the forward direction is toward the upstream.
  8. 　外気が流入しうる下流端を有する端部配管と、
    　前記端部配管に設けられた下流仕切弁と、
    　前記端部配管の前記下流仕切弁よりも上流に設けられた上流仕切弁と、
    　前記端部配管の前記下流仕切弁と前記上流仕切弁の間に位置する中間区画と前記上流仕切弁よりも上流に位置する上流区画とをつなぐ補助配管と、
    　前記補助配管に設けられ、前記上流区画から前記中間区画への流れを許容する一方、前記中間区画から前記上流区画への流れを禁止する逆止弁と、を備えている、配管設備。
          an end pipe having a downstream end through which outside air can flow;
    A downstream gate valve provided in the end pipe;
    an upstream gate valve provided upstream of the downstream gate valve of the end pipe;
    an auxiliary pipe connecting an intermediate section located between the downstream gate valve and the upstream gate valve of the end pipe and an upstream section located upstream of the upstream gate valve;
    a check valve provided in the auxiliary piping for allowing flow from the upstream compartment to the intermediate compartment while prohibiting flow from the intermediate compartment to the upstream compartment.
PCT/JP2022/041415 2022-11-07 2022-11-07 Method for blocking end piping, outside air inflow determination method, and piping equipment WO2024100724A1 (en)

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JP2013241054A (en) * 2012-05-18 2013-12-05 Mitsubishi Heavy Ind Ltd Vessel, gas fuel supply equipment and method of operating gas fuel supply equipment
JP2016006336A (en) * 2014-06-20 2016-01-14 株式会社Ihi Leakage detector for gate valve
WO2016181650A1 (en) * 2015-05-11 2016-11-17 川崎重工業株式会社 Ship provided with piping for disposing of liquid hydrogen
WO2017010095A1 (en) * 2015-07-15 2017-01-19 川崎重工業株式会社 Liquefied hydrogen loading arm, and liquefied hydrogen transportation method
WO2022080376A1 (en) * 2020-10-14 2022-04-21 川崎重工業株式会社 Gas inspecting method, and gas inspecting facility

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013241054A (en) * 2012-05-18 2013-12-05 Mitsubishi Heavy Ind Ltd Vessel, gas fuel supply equipment and method of operating gas fuel supply equipment
JP2016006336A (en) * 2014-06-20 2016-01-14 株式会社Ihi Leakage detector for gate valve
WO2016181650A1 (en) * 2015-05-11 2016-11-17 川崎重工業株式会社 Ship provided with piping for disposing of liquid hydrogen
WO2017010095A1 (en) * 2015-07-15 2017-01-19 川崎重工業株式会社 Liquefied hydrogen loading arm, and liquefied hydrogen transportation method
WO2022080376A1 (en) * 2020-10-14 2022-04-21 川崎重工業株式会社 Gas inspecting method, and gas inspecting facility

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