Vent system and vent method

Abstract

A vent system (1) according to the present disclosure comprises: a supply-side inert gas tank (11) which supplies inert gas; an inert gas sending pipe (13) in which a gas transport pipe line is provided and which sends the inert gas; and a recovery-side inert gas tank (14) which recovers the inert gas that has been sent.

Description

[Technical Field]

[0001] The present disclosure relates to vent systems and methods. [Background technology]

[0002] In recent years, with the aim of achieving decarbonization and carbon neutrality, methods for supplying hydrogen gas and the safety of supplying hydrogen gas have been studied in order to utilize hydrogen gas. For example, Non-Patent Document 1 describes the provision of a hydrogen pipeline for transporting hydrogen and the detection of leaked hydrogen with a detector. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Tetsuji Morita, "Initiatives for Hydrogen Pipeline Supply in the City Gas Industry," Institute of Electrical Installation Engineers, Journal of the Institute of Electrical Installation Engineers 36 (4), 242-245, 2016 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the prior art, hydrogen can leak from a hydrogen pipeline 93 that supplies hydrogen from a supply-side hydrogen tank 91 to a consumption-side hydrogen tank 92 in an underground space S1, as shown in Figure 7. The underground space S1 is a space defined by a manhole 94 or the like provided underground A. Hydrogen can also leak from the hydrogen pipeline 93 in a pipe 95 that connects the underground spaces S1 to each other. In such cases, the leaked hydrogen is naturally diffused to the outside of the underground space S1. Because the natural diffusion of hydrogen takes time, the underground space S1 is filled with hydrogen until then, which poses a risk of an explosion within the underground space S1.

[0005] The present disclosure was made in consideration of the above circumstances, and aims to provide a vent system and a vent method that discharge gas leaking from a gas transport pipeline into aboveground space without filling the underground space. [Means for solving the problem]

[0006] In order to solve the above problems, the vent system of the present disclosure comprises a supply-side inert gas tank that supplies inert gas, an inert gas supply pipe that supplies the inert gas and has a gas transport pipeline arranged inside, and a recovery-side inert gas tank that recovers the inert gas that has been supplied.

[0007] In addition, in order to solve the above-mentioned problems, the venting method of the present disclosure is a venting method performed by a vent system including a supply-side inert gas tank, an inert gas supply pipe with a gas transport pipeline arranged inside, and a recovery-side inert gas tank, and includes the steps of: the supply-side inert gas tank supplying an inert gas; the inert gas supply pipe supplying the inert gas; and the recovery-side inert gas tank recovering the inert gas that has been supplied. [Effects of the Invention]

[0008] According to the vent system and vent method disclosed herein, gas leaking from a gas transport pipeline can be discharged to aboveground space without filling the underground space. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of a vent system according to an embodiment of the present disclosure. [Figure 2A] 2 is a schematic diagram showing a half pipe forming a part of the inactivation gas supply pipe shown in FIG. 1. FIG. [Figure 2B] 2B is a schematic diagram showing a part of an inactivation gas supply pipe formed by fitting the half pipe shown in FIG. 2A. FIG. [Figure 3] 2 is a diagram for explaining in detail the fixing portion shown in FIG. 1. FIG. [Figure 4] FIG. 2 is a functional block diagram of the determination device shown in FIG. [Figure 5] FIG. 10 is a sequence diagram showing a process for constructing a vent system. [Figure 6] FIG. 10 is a sequence diagram showing the operation of the vent system. [Figure 7] FIG. 1 is a schematic diagram illustrating a conventional underground space in which a gas transport pipeline is provided. DETAILED DESCRIPTION OF THE INVENTION

[0010] The overall configuration of this embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram of a vent system 1 according to this embodiment.

[0011] As shown in FIG. 1, the vent system 1 according to this embodiment is a system for discharging gas leaked from a gas transport pipeline 21 disposed in an underground space S1. The underground space S1 is a space defined by underground structures 22, such as manholes, tunnels, and handholes, disposed underground A. In the example shown in FIG. 1, three underground structures 22a to 22c are disposed in the underground space S1. Pipelines 23 are attached to the underground structures 22, and the plurality of underground spaces S1 are interconnected by the pipelines 23. The pipelines 23 preferably have high airtightness so that, in the event of gas leaking from the gas transport pipeline 21 disposed therein, further leakage of gas to the outside of the pipelines 23 is suppressed.

[0012] The gas transport pipeline 21 is a pipeline that transports gas from a supply-side gas tank 24 disposed in the aboveground space S2 to a consumption-side gas tank 25. In this embodiment, the gas is hydrogen, and the gas transport pipeline 21 is a hydrogen pipeline, but is not limited to this.

[0013] Specifically, one end of the gas transport pipeline 21 is provided at the supply port of the supply-side gas tank 24 so that the gas supplied from the supply-side gas tank 24 is received by the gas transport pipeline 21. The other end of the gas transport pipeline 21 is provided at the receiving port of the consumption-side gas tank 25 so that the gas transported through the gas transport pipeline 21 flows into the consumption-side gas tank 25. In other words, the gas transport pipeline 21 extends from the supply port of the supply-side gas tank 24, through the underground space S1 and the pipeline 23, to the receiving port of the consumption-side gas tank 25.

[0014] The vent system 1 comprises a supply side inert gas tank 11, a recovery side inert gas tank 12, an inert gas supply pipe 13, a fixing part 14, a supply side gas pressure gauge 15, a consumption side gas pressure gauge 16, a supply side inert gas pressure gauge 17, a recovery side inert gas pressure gauge 18, and a determination device 19.

[0015] The supply-side inert gas tank 11 supplies the inert gas. Specifically, the supply-side inert gas tank 11 pressure-feeds the inert gas to the inert gas supply pipe 13 using a pump or the like. For example, the supply-side inert gas tank 11 may supply the inert gas when it is determined that gas is leaking from the gas transport pipeline 21. Specifically, when a determination device 19, which will be described in detail later, determines that gas is leaking, it outputs a control command to control the supply-side inert gas tank 11 to supply the inert gas. The supply-side inert gas tank 11 is then controlled based on the control command to supply the inert gas. The inert gas is a chemically stable gas that does not easily react with other elements or compounds. Examples of the inert gas include nitrogen, helium, neon, argon, krypton, xenon, radon, and carbon dioxide. The supply-side inert gas tank 11 may be located in the aboveground space S2.

[0016] The recovery-side inert gas tank 12 recovers the inert gas supplied by the inert gas supply pipe 13. Thus, in the event of a gas leak from the gas transport pipeline 21, the recovery-side inert gas tank 12 recovers the gas that has leaked from the gas transport pipeline 21 and that was supplied together with the inert gas by the inert gas supply pipe 13. The recovery-side inert gas tank 12 may be disposed in the above-ground space S2.

[0017] The inert gas supply pipe 13 has a gas transport pipeline 21 disposed therein and supplies the inert gas. Specifically, the inert gas supply pipe 13 is provided so as to supply the inert gas from the supply-side inert gas tank 11 to the recovery-side inert gas tank 12 via a pipeline 23. In the example shown in Fig. 1, the inert gas supply pipe 13 includes inert gas supply pipes 13a to 13c.

[0018] One end of the inactivated gas supply pipe 13a is connected to the supply port of the supply-side inactivated gas tank 11, so that gas supplied from the supply-side inactivated gas tank 11 is supplied to the inactivated gas supply pipe 13. The other end of the inactivated gas supply pipe 13a is connected to a pipeline 23 attached to the underground structure 22a. One end of the inactivated gas supply pipe 13b is connected to a pipeline 23 that connects the interiors of the underground structures 22a and 22b, and the other end of the inactivated gas supply pipe 13b is connected to a pipeline 23 that connects the interiors of the underground structures 22b and 22c. One end of the inactivated gas supply pipe 13c is connected to a pipeline 23 attached to the underground structure 22c. The other end of the inactivated gas supply pipe 13c is connected to the receiving port of the recovery-side inactivated gas tank 12, and is configured so that the inactivated gas supplied through the inactivated gas supply pipe 13c flows into the recovery-side inactivated gas tank 12 via the receiving port. As a result, the inactivated gas supplied from the supply-side inactivated gas tank 12 to the inactivated gas supply pipe 13 is supplied to the recovery-side inactivated gas tank 12 through the inactivated gas supply pipe 13 and the pipeline 23.

[0019] The inert gas supply pipe 13 may be a flexible pipe. The flexible pipe is a pipe whose size and shape are variable, and may be, for example, a bellows pipe. This allows the gas transport pipeline 21 to be disposed inside the inert gas supply pipe 13 even if it is bent or folded.

[0020] The inert gas supply pipe 13 is made of a material that can withstand the pressure (e.g., 0.95 MPa) of the inert gas supplied through the inert gas supply pipe 13, and this material can be, for example, stainless steel (SUS: Steel Use Stainless). The diameter of the inert gas supply pipe 13 can be the same as the diameter of the conduit 23 (the diameter of a typical conduit 23 is 75 mm), and in this configuration, gas leakage at the portion where the inert gas supply pipe 13 and the conduit 23 are connected can be suppressed.

[0021] As shown in Fig. 2A, the inactivated gas supply pipe 13 may be formed by a plurality of half pipes 13-1 and 13-2 fitted together. For example, the half pipes 13-1 and 13-2 facing each other in the radial direction of the gas transport pipeline 21 may be fitted together, and multiple sets of fitted half pipes 13-1 and 13-2 may be fitted together so as to be connected in the extension direction of the gas transport pipeline 21, thereby forming the inactivated gas supply pipe 13 with the gas transport pipeline 21 disposed therein, as shown in Fig. 2B. Note that the fitting portions formed on the half pipes 13-1 and 13-2 for fitting the multiple half pipes 13-1 and 13-2 together may have any shape, and therefore detailed description of the fitting portions is omitted in Fig. 2A.

[0022] Furthermore, the half pipe 13-1 and the half pipe 13-2 may be bonded together by welding. This can improve the airtightness of the inert gas supply pipe 13 and can prevent gas leaking from the gas transport pipeline 21 from leaking to the outside of the inert gas supply pipe 13. Furthermore, a combination of multiple fitted half pipes 13-1 and 13-2 adjacent to each other in the extension direction of the gas transport pipeline 21 may be bonded together by welding. This can further improve the airtightness of the inert gas supply pipe 13.

[0023] By forming the inactivated gas supply pipe 13 in this manner, the gas supplied from the supply-side inactivated gas tank 11 passes inside the inactivated gas supply pipe 13 but outside the gas transport pipe 21 disposed within the inactivated gas supply pipe 13, and is supplied to the recovery-side inactivated gas tank 12. At this time, if gas is leaking from the gas transport pipe 21, the gas leaking from the gas transport pipe 21 will not leak outside the inactivated gas supply pipe 13, but will be supplied to the recovery-side inactivated gas tank 12 together with the inactivated gas.

[0024] Fig. 3 is an enlarged view of the inside of a rectangle B indicated by a dashed line in Fig. 1. As shown in Fig. 3, the fixing part 14 includes a duct connection port 141 and an anchor 142.

[0025] The duct connection port 141 is attached to the end of the inertized gas supply pipe 13, and is a component that is attached to the underground structure 22 with the end of the inertized gas supply pipe 13 attached. For example, the duct connection port 141 may be formed of a flat plate with a circular hole. The diameter of the hole can be approximately the same as the inner diameter of the inertized gas supply pipe 13. The end of the inertized gas supply pipe 13 is crimped and attached to one side of the duct connection port 141 so that the hole in the flat plate that constitutes the duct connection port 141 communicates with the inside of the inertized gas supply pipe 13.

[0026] The anchor 142 is a member that fixes the duct connection port 141, to which the end of the inert gas supply pipe 13 is attached, to the underground structure 22. For example, the anchor 142 may be inserted from one side of the duct connection port 141 into the wall of the underground structure 22, with the other side of the duct connection port 141 being crimped to the inner wall of the underground structure 22. In this case, multiple anchors 142 may be inserted from one side of the duct connection port 141 into the wall surface of the manhole. This makes it possible to prevent deformation of the duct connection port 141 due to the pressure of the inert gas supplied by the inert gas supply pipe 13.

[0027] The supply-side gas pressure gauge 15 measures the internal pressure of the supply-side gas tank 24. The internal pressure of the supply-side gas tank 24 may be the pressure of the gas at the supply port of the supply-side gas tank 24.

[0028] The consuming-side gas pressure gauge 16 measures the internal pressure of the consuming-side gas tank 25. The internal pressure of the consuming-side gas tank 25 may be the pressure of the gas at the receiving port of the consuming-side gas tank 25.

[0029] The supply-side inert gas pressure gauge 17 measures the internal pressure of the supply-side inert gas tank 11. The internal pressure of the supply-side inert gas tank 11 may be the pressure of the gas at the supply port of the supply-side inert gas tank 11.

[0030] The recovery-side inert gas pressure gauge 18 measures the internal pressure of the recovery-side inert gas tank 12. The internal pressure of the recovery-side inert gas tank 12 may be the pressure of the gas at the receiving port of the recovery-side inert gas tank 12.

[0031] As shown in FIG. 4, the determination device 19 includes an input unit 191, a gas leakage determination unit 192, an inert gas leakage determination unit 193, and an output unit 194. The input unit 191 can be configured by an input interface that accepts information input. The input unit 191 may accept information input through user operation using a pointing device, keyboard, mouse, touch panel, etc., or may accept information input received from an external device. The gas leakage determination unit 192 and the inert gas leakage determination unit 193 can be configured by a controller. The controller may be configured by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array), or may be configured by a processor, or may include both. The output unit 194 can be configured by an output interface that outputs information.

[0032] The input unit 191 accepts input of supply-side gas tank internal pressure information indicating the internal pressure of the supply-side gas tank 24 measured by the supply-side gas pressure gauge 15, and consumption-side gas tank internal pressure information indicating the internal pressure of the consumption-side gas tank 25 measured by the consumption-side gas pressure gauge 16. The input unit 191 may also accept input of supply-side inactivated gas tank internal pressure information indicating the internal pressure of the supply-side inactivated gas tank 11 measured by the supply-side inactivated gas pressure gauge 17, and recovery-side inactivated gas tank internal pressure information indicating the internal pressure of the recovery-side inactivated gas tank 12 measured by the recovery-side inactivated gas pressure gauge 18.

[0033] The gas leak determination unit 192 determines whether or not gas is leaking from the gas transport pipeline 21 based on the internal pressure of the supply-side gas tank 24 that supplies gas to the gas transport pipeline 21 and the internal pressure of the consumption-side gas tank 25 that receives the gas transported by the gas transport pipeline 21. Specifically, the gas leak determination unit 192 calculates the difference between the internal pressure of the supply-side gas tank 24 and the internal pressure of the consumption-side gas tank 25, and determines whether or not the difference is equal to or greater than a gas difference threshold. Then, if the gas leak determination unit 192 determines that the difference is equal to or greater than the gas difference threshold, it determines that gas is leaking, and if it determines that the difference is less than the gas difference threshold, it determines that gas is not leaking.

[0034] The inert gas leakage determination unit 193 determines whether or not inert gas is leaking from the inert gas supply pipe 13 based on the internal pressure of the supply-side inert gas tank 11 and the internal pressure of the recovery-side inert gas tank 12. Specifically, the inert gas leakage determination unit 193 calculates the difference between the internal pressure of the supply-side inert gas tank 11 and the internal pressure of the recovery-side inert gas tank 12, and determines whether or not the difference is equal to or greater than the inert gas difference threshold. If the inert gas leakage determination unit 193 determines that the difference is equal to or greater than the inert gas difference threshold, it determines that inert gas is leaking, and if the difference is less than the inert gas difference threshold, it determines that inert gas is not leaking.

[0035] When the gas leakage determination unit 192 determines that gas is leaking, the output unit 194 outputs a control command to the supply-side inert gas tank 11 to control the supply-side inert gas tank 11 to supply inert gas. When the gas leakage determination unit 192 determines that gas is leaking, the output unit 194 may output information indicating the gas leakage to a display device configured with an organic EL (Electro Luminescence) panel, a liquid crystal panel, or the like, or to another device. The output unit 194 may output information indicating whether or not gas is leaking, as determined by the gas leakage determination unit 192, to the display device or another device.

[0036] Furthermore, when the inert gas leakage determination unit 193 determines that the inert gas is leaking, the output unit 194 may output information indicating the leakage of the inert gas to a display device or another device. The output unit 194 may output information indicating whether or not the inert gas is leaking, determined by the inert gas leakage determination unit 193, to a display device or another device.

[0037] <Construction of a vent system> Here, a process for constructing the vent system 1 according to this embodiment will be described with reference to Fig. 5. Fig. 5 is a sequence diagram showing an example of a process for constructing the vent system 1 according to this embodiment.

[0038] In step S11, the inactivated gas supply pipe 13 is formed. Specifically, the opposing half pipes 13-1 and 13-2 are fitted together in a state where the opposing half pipes 13-1 and 13-2 face each other in the radial direction of the gas transport pipeline 21. Then, a plurality of fitted combinations of half pipes 13-1 and 13-2 are fitted together so as to be connected in the extension direction of the gas transport pipeline 21. Furthermore, the half pipes 13-1 and 13-2 may be bonded together by welding, or a plurality of fitted combinations of half pipes 13-1 and 13-2 may be bonded together by welding.

[0039] In step S12, the end of the inactivated gas supply pipe 13 is installed. In the example shown in FIG. 1 , the end of the inactivated gas supply pipe 13a on the supply side of the inactivated gas tank 11 is connected to the supply port of the inactivated gas tank 11. The opposite end of the inactivated gas supply pipe 13a is crimped and attached to the duct connection port 141, and the duct connection port 141 is fixed to the underground structure 22a. One end of the inactivated gas supply pipe 13b is connected to one of the pipe openings of the underground structure 22b, and the other end of the inactivated gas supply pipe 13b is connected to the other pipe opening of the underground structure 22b. The end of the inactivated gas supply pipe 13c on the recovery side of the inactivated gas tank 12 is connected to the receiving port of the inactivated gas tank 11. The other end of the inactivated gas supply pipe 13a is attached by crimping to the duct connection port 141, and the duct connection port 141 is fixed to the underground structure 22c.

[0040] In step S13, the inert gas is supplied from the supply-side inert gas tank 11 to the inert gas supply pipe 13.

[0041] In step S14, it is determined whether or not the inert gas is leaking from the inert gas supply pipe 13.

[0042] If it is determined in step S14 that inert gas is leaking from the inert gas supply pipe 13, in step S15 the supply of inert gas is stopped, the part of the inert gas supply pipe 13 where the inert gas is leaking is repaired (reformed or re-installed), and the process returns to step S13.

[0043] If it is determined in step S14 that the inert gas is not leaking from the inert gas supply pipe 13, the process of constructing the vent system 1 is terminated.

[0044] If it is determined in step S14 that the inactivated gas is not leaking from the inactivated gas supply pipe 13, it may be determined whether or not the gas is leaking from the gas transport pipeline 21. If it is determined that the gas is leaking from the gas transport pipeline 21, the portion of the gas transport pipeline 21 where the gas is leaking may be repaired.

[0045] <Operation of the determination device> Next, the operation of the vent system 1 according to this embodiment will be described with reference to FIG. 6. FIG. 6 is a sequence diagram showing an example of the operation of the vent system 1 according to this embodiment. The operation of the vent system 1 described with reference to FIG. 6 corresponds to a venting method performed by the vent system 1 according to this embodiment. The vent system 1 performs an operation when the supply-side gas tank 24 supplies gas to the gas transport pipeline 21. The vent system 1 can start an operation at any timing. For example, the vent system 1 may start an operation at a predetermined time interval, may start an operation in response to an operation by an administrator or a command received from an external device, or may start an operation again after an operation has ended.

[0046] In step S21, the supply-side gas pressure gauge 15 measures the internal pressure of the supply-side gas tank 24, and the consumption-side gas pressure gauge 16 measures the internal pressure of the consumption-side gas tank 25.

[0047] In step S22, the determination device 19 receives input of supply-side gas tank internal pressure information indicating the internal pressure of the supply-side gas tank 24 measured by the supply-side gas pressure gauge 15. The determination device 19 also receives input of consumption-side gas tank internal pressure information indicating the internal pressure of the consumption-side gas tank 25 measured by the consumption-side gas pressure gauge 16.

[0048] In step S23, the determination device 19 determines whether gas is leaking from the gas transport pipeline 21 based on the internal pressure of the supply side gas tank 24 indicated by the supply side gas tank internal pressure information and the internal pressure of the consumption side gas tank 25 indicated by the consumption side gas tank internal pressure information.

[0049] If it is determined in step S23 that gas is not leaking from the gas transport pipeline 21, the vent system 1 ends the process.

[0050] If it is determined in step S23 that gas is leaking from the gas transport pipeline 21, in step S24 the determination device 19 outputs a control command to control the supply side inert gas tank 11 to supply inert gas.

[0051] In step S25, the supply-side inert gas tank 11 supplies the inert gas based on the control command.

[0052] In step S26, the inert gas supply pipe 13 supplies the inert gas.

[0053] In step S27, the recovery-side inert gas tank 12 recovers the inert gas sent in step S26. After that, the vent system 1 returns to step S21 and repeats the process.

[0054] Furthermore, when it is determined in step S23 that gas is leaking from the gas transport pipeline 21, the determination device 19 may output information indicating the gas leak to a display device or another device. This allows the manager of the gas transport pipeline 21 to recognize that the gas transport pipeline 21 needs to be repaired. Furthermore, before the manager enters the underground space S1 to repair the gas transport pipeline 21, the determination device 19 may determine whether or not gas is leaking from the gas transport pipeline 21 and whether or not inert gas is leaking from the inert gas supply pipe 13. This allows the manager to recognize whether or not gas is leaking from the gas transport pipeline 21 and the inert gas supply pipe 13, and can enter the underground space S1 after confirming safety.

[0055] As described above, according to this embodiment, the vent system 1 includes the supply-side inert gas tank 11 that supplies inert gas, the inert gas supply pipe 13 that supplies the inert gas and has the gas transport pipeline 21 disposed therein, and the recovery-side inert gas tank 12 that recovers the supplied inert gas. As a result, in the event of a gas leak from the gas transport pipeline 21, the vent system 1 can discharge the leaked gas together with the inert gas without filling the underground space S1. In particular, the supply-side inert gas tank 11 pressure-feeds the inert gas to the inert gas supply pipe 13, thereby more effectively discharging the gas leaked from the gas transport pipeline 21. This prevents the leaked gas from filling the underground space S1. This reduces the risk of an explosion in the underground space S1 due to hydrogen filling the underground space S1. Therefore, workers can safely enter the underground space S1, for example, to repair equipment within the underground space S1.

[0056] Furthermore, according to this embodiment, the supply-side inert gas tank 11 may supply inert gas when it is determined that gas is leaking from the gas transport pipeline 21. As a result, the supply-side inert gas tank 11 does not always supply inert gas, but supplies gas when it is determined that gas is leaking, so that the use of inert gas can be reduced while the leaked gas can be discharged from the underground space S1.

[0057] Furthermore, according to this embodiment, the vent system 1 may further include a determination device 19 that determines whether or not gas is leaking from the gas transport pipeline 21 based on the internal pressure of the supply-side gas tank 24 that supplies gas to the gas transport pipeline 21 and the internal pressure of the consumption-side gas tank 25 that receives the gas delivered by the gas transport pipeline 21. This allows an operator to safely determine whether or not gas is leaking without installing a gas detector in a location where gas may be leaking.

[0058] Furthermore, according to this embodiment, the determination device 19 may determine whether or not inert gas is leaking from the inert gas supply pipe 13 based on the internal pressure of the supply-side inert gas tank 11 and the internal pressure of the recovery-side inert gas tank 12. This allows an operator to recognize the inert gas leak and repair the inert gas supply pipe 13 as appropriate. Accordingly, if gas leaks from the gas transport pipeline 21, the leaked gas can be reliably discharged without filling the underground space S1 together with the inert gas.

[0059] The following additional notes are provided regarding the above-described embodiments. (Additional note 1) a supply-side inert gas tank for supplying an inert gas; an inert gas supply pipe for supplying the inert gas, the inert gas supply pipe having a gas transport pipeline disposed therein; a recovery side inert gas tank for recovering the delivered inert gas; A vent system comprising: (Additional note 2) 2. The vent system according to claim 1, wherein the supply-side inert gas tank supplies the inert gas when it is determined that gas is leaking from the gas transport pipeline. (Additional note 3) Further comprising a controller; The controller The vent system described in appended claim 2 determines whether or not gas is leaking from the gas transport pipeline based on the internal pressure of a supply gas tank that supplies gas to the gas transport pipeline and the internal pressure of a consumption gas tank that receives the gas transported by the gas transport pipeline. (Additional note 4) The vent system described in Appendix 3, wherein the controller determines whether or not the inert gas is leaking from the inert gas supply pipe based on the internal pressure of the supply-side inert gas tank and the internal pressure of the recovery-side inert gas tank. (Additional note 5) A venting method carried out by a venting system including a supply-side inert gas tank, an inert gas supply pipe having a gas transport pipeline disposed therein, and a recovery-side inert gas tank, the method comprising: the supply-side inert gas tank supplies an inert gas; the inert gas supply pipe supplies the inert gas, The recovery side inert gas tank recovers the delivered inert gas. Venting method.

[0060] All publications, patent applications, and technologies mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, and technology was specifically and individually indicated to be incorporated by reference.

[0061] Although the above-described embodiments have been described as typical examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present disclosure. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications or alterations are possible without departing from the scope of the claims. [Explanation of symbols]

[0062] 1. Vent System 11 Supply side inerted gas tank 12 Recovery side inerted gas tank 13, 13a, 13b, 13c Inert gas supply pipe 13-1, 13-2 Half tube 14 Fixed part 15 Supply gas pressure gauge 16. Consumer gas pressure gauge 17 Supply side inerting gas pressure gauge 18 Recovery side inert gas pressure gauge 19 Judgment device 21 Gas pipeline 22, 22a, 22b, 22c underground structures 23 Conduit 24 Supply gas tank 25 Gas tank on the consumption side 141 Duct connection port 142 Anchor 191 Input section 192 Gas Leak Judgment Unit 193 Inert gas leak detection unit 194 Output section A Underground S1 underground space S2 Ground space

Claims

1. a supply-side inert gas tank for supplying an inert gas; an inert gas supply pipe for supplying the inert gas, the inert gas supply pipe having a gas transport pipeline disposed therein; a recovery side inert gas tank for recovering the delivered inert gas; A vent system comprising:

2. The vent system according to claim 1 , wherein the supply-side inert gas tank supplies the inert gas when it is determined that gas is leaking from the gas transport pipeline.

3. 3. The vent system according to claim 2, further comprising a determination device that determines whether gas is leaking from the gas transport pipeline based on the internal pressure of a supply-side gas tank that supplies gas to the gas transport pipeline and the internal pressure of a consumption-side gas tank that receives the gas transported by the gas transport pipeline.

4. 4. The vent system of claim 3, wherein the determination device determines whether the inert gas is leaking from the inert gas supply pipe based on the internal pressure of the supply side inert gas tank and the internal pressure of the recovery side inert gas tank.

5. A venting method carried out by a venting system including a supply-side inert gas tank, an inert gas supply pipe having a gas transport pipeline disposed therein, and a recovery-side inert gas tank, the method comprising: the supply-side inert gas tank supplies an inert gas; a step of supplying the inert gas through the inert gas supply pipe; The recovery side inert gas tank recovers the delivered inert gas; A venting method comprising:

Images