JP3586346B2 - Gas supply system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas supply system, and more particularly, to a gas supply system that can easily supply gas when an existing pipe cannot be used.
[0002]
[Prior art]
Pipes such as gas pipes buried underground may be damaged by external force generated at the time of a disaster such as an earthquake, etc., resulting in gas leakage, or supply failure due to leakage of water pipes or intrusion of groundwater. In some cases, its use may be interrupted and repair may be required.
Conventionally, the following work has been performed when repairing such piping.
Repair work on pipes involves replacing part of the low-pressure pipe or part of the medium-pressure pipe, and in addition, between the low-pressure pipe and the service pipe drawn from the low-pressure pipe into the private area, or In some cases, bypass paths may be temporarily provided between the pressure pipe and the supply pipe being drawn into the supply destination, or over a part of the replaced pipeline, and when the bypass path is temporarily provided, the bypass path may be provided via the bypass path. Repair the pipeline while maintaining the gas supply.
[0003]
[Problems to be solved by the invention]
However, in the method of temporarily installing a bypass when replacing a pipeline, work such as temporary construction or removal of the bypass is required separately from the replacement work. For this reason, the work time and man-hours required for the replacement work increase, and the time until the gas supply is restarted may be long.
By the way, in addition to the above-mentioned repair work, there is, for example, an airtightness test for a supply pipe drawn in from a low-pressure main branch pipe as a work that requires a long time until the gas supply is restarted.
In the airtightness test, after shutting off the gas flow from the low-pressure main pipe to the supply pipe, air that is set to an airtightness test pressure higher than the supply pressure normally set in the supply pipe is enclosed, and after the test, A purge operation is performed to remove the enclosed air. When such an airtight test is performed, it takes a long time to perform an air purge operation, and at present, it is impossible to immediately restart the gas supply after the test. Such an airtight test is also performed when the supply of gas to the pipeline is stopped and when the gas supply is restarted.
Further, when a bypass is temporarily provided, it is necessary to use the same pressure gas between the pipes connected to the bypass.
[0004]
An object of the present invention is to provide a simple gas supply in view of the above-mentioned problem in the case where the conventional gas supply is interrupted, thereby preventing a prolonged working time caused when an underground pipeline cannot be used or the like. Another object of the present invention is to provide a gas supply system capable of improving the safety in security by optimizing the supply pressure at the time of supply.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 provides a gas supply in which a high-pressure container filled with gas is positioned on an input side and a first connection portion connectable to a gas supply destination is positioned on an output side. In the path, a plurality of the high-pressure vessels are arranged on the input side, a gas in one high-pressure vessel selected from the plurality of high-pressure vessels is taken in, and the pressure of the gas taken in from the high-pressure vessel is increased in a plurality of stages. The pressure is reduced to the final pressure used at the gas supply destination by the pressure reducing unit, the gas passing between the pressure reducing units is introduced into the heat exchange unit to perform a temperature correction process, and the gas supply behind the heat exchange unit is performed. A second connecting portion capable of extracting and introducing a gas having a pressure higher than the gas pressure extracted from the first connecting portion is provided separately from the first connecting portion in the path, and gas discharge from the heat exchanging portion is provided. The pressure is higher than the specified pressure Come to providing an emergency shutoff unit capable of shutting off the gas supply to the primary side pressure reducing portion of the pressure reducing portion of the plurality of stages, the emergency shut-off unit in the case of supplying gas to the supply destination captures gas from the high pressure vessel Opening / closing is controlled by the pressure of the gas discharged from the heat exchange section, and when gas is introduced from the second connection section, gas is supplied from the second connection section to the first connection section. Is performed.
[0006]
[Action]
According to the first aspect of the present invention, an emergency shut-off unit that shuts off and controls supply of gas to the primary-side depressurizing unit, and a gas having a pressure higher than the pressure to the first connection unit and the supply destination that can be connected to the supply destination. A second connection is provided which can be removed and introduced. Thereby, when opening / closing the emergency shutoff unit is controlled by the pressure of the gas from the primary side decompression unit, the gas from the high pressure vessel can be supplied to either the first connection unit or the second connection unit. When the gas is introduced into the second connection portion, the gas can be supplied from the second connection portion to the first connection portion. Therefore, the gas can be supplied to the first connecting portion by selecting either the high pressure vessel or the existing pipe. In addition, when a pressure equal to or higher than a predetermined pressure is supplied by the emergency shutoff unit for some reason, the gas is shut off by the emergency shutoff unit. It is possible to prevent a gas at a pressure from being supplied to a supply destination.
[0007]
【Example】
Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.
The gas supply system according to the present invention is provided when the gas in the high-pressure vessel located on the input side is set at a required pressure at the supply destination and supplied, and when the gas is cut off in a part of the low-pressure pipe. It is characterized in that the gas in the medium pressure pipe can be selected to be supplied at a required pressure set in the low pressure pipe as the supply destination.
FIG. 1 and FIG. 2 are schematic views for explaining an embodiment for the former case of the gas supply system described above, and FIG. 1 shows a high-pressure gas supply system equipped with a gas supply device described later. FIG. 2 shows a case in which the gas in the container is supplied to the service pipe, and FIG. 2 shows a case in which the gas in the high-pressure container is supplied to the medium pressure pipe.
FIG. 3 is a schematic diagram for explaining an embodiment targeting the latter case of the gas supply method. In this embodiment, a case where the gas is supplied from the medium pressure pipe to the service pipe is shown. Have been. The medium-pressure pipe referred to in the present embodiment is intended for the medium-pressure pipe B in which the gas supply pressure is set to be less than 1 to 3 kg / cm ² . It is to be noted that not only the medium pressure pipe but also the medium pressure pipe A to which the supply pressure of ^{3 to} less than 10 kg / cm ² is set can be used. In this embodiment, the pressure applied to the low-pressure pipe is 240 mmAq. However, the pressure supplied to the low-pressure pipe is 100 to 250 mmAq in the case of natural gas (13A). It should be noted that it is also possible to select any one of these pressures.
[0008]
In the gas supply system shown in FIG. 1, an opening is formed in a part of a meter stand 5 which communicates with a gas meter 4 connected to a service pipe 2 which is drawn into a private area from a low-pressure pipe 1, and the opening is formed. A coupler 50 is mounted on the output side of the gas supply device 7 equipped with the high-pressure vessel 3 described below, which serves as a first connection portion.
In the gas supply system shown in FIG. 2, an opening is formed in a part of a medium-pressure pipe (indicated by a reference numeral 1 'for convenience), and the opening is formed in the gas supply apparatus 7 equipped with a high-pressure container 3 described later. Is attached.
Further, in the gas supply system shown in FIG. 3, similarly to the case shown in FIG. 2, a coupler 51 forming a second connection portion in the gas supply device 7 is attached to an opening formed in the intermediate pressure pipe 1 ′, In the supply device 7, the coupler 50 forming the first connection portion is attached to an opening formed in a part of the meter stand 5.
[0009]
The gas supply device 7 is a part that is a feature of the present invention. As shown in FIG. 4, a gas supply control unit 9 mounted on a truck 8 and a cylinder 10 corresponding to the high-pressure container 3 filled with city gas are provided. And a gas supply unit 11 containing the same.
The carriage 8 has a mounting portion 8A on which a plurality of cylinders 10, in this embodiment, two can be mounted, and a gas supply control portion 9 is provided adjacent to the mounting portion 8A.
[0010]
FIG. 5 is a block diagram for explaining the relationship between the gas supply control unit 9 and the gas supply unit 11 described above. In the figure, the gas supply unit 11 has a capacity of 200 kg / cm ^{2 in} the present embodiment. A cylinder filled with 10 Nm ³ / volume of city gas in a 50 L (liter) container under pressure and a cylinder filled with ² Nm ³ / volume of city gas in a 10 L (liter) container under a pressure of 200 kg / cm ^2. 5 are set (in FIG. 5, 50L and 10L, which are numbers indicating the capacities of a plurality of cylinders, are attached to a plurality of cylinders). Note that the capacity of the cylinder is not limited to the above-described capacity, and it is of course possible to select the capacity according to the specifications at the supply destination.
The pipes from each system are collected at appropriate places and connected to the primary-side pressure reducing unit 12. A check valve 11a is disposed in the piping of each system to prevent gas from flowing backward from an unused cylinder 10 to a supplied cylinder. Further, the gas pressure in each system can be monitored by the pressure gauge 11b, so that the replacement operation with the new cylinder 10 and the abnormality detection can be performed at the time when the gas in the cylinder is completely supplied. Has become. At the time of replacement of the cylinder 10, it is necessary to shut off the gas in the system in which the cylinder 10 requiring replacement is arranged. Therefore, a manually operable on-off valve 11c is installed in the system.
[0011]
In FIG. 5, in the supply path of the gas supplied from the gas supply unit 11, the gas supply unit 11 side is set as the input side, and the coupler 50 corresponding to the first connection part with the supply destination pipe is set as the output side. In the meantime, a plurality of pressure reducing sections, in this embodiment, a primary pressure reducing section 12 and a secondary pressure reducing section 13 are installed along the gas supply direction.
Regulator valves 12a and 13a are used for both the primary and secondary decompression sections 12 and 13, and the primary decompression section 12 has a charging pressure of 200 kg / city of city gas filled in the cylinder 10. the cm ^2, integer pressure characteristics of pressure reduction is set to 2.5 Kg / cm ^2, which corresponds to the supply pressure to the intermediate pressure pipe, the secondary pressure reducing portion 13, generally a vacuum gas pressure on the primary side pressure reducing portion 12 A pressure regulation characteristic for reducing the pressure to 240 mmAq, which is the pressure at a supply destination such as at home, is set. In FIG. 5, the numbers assigned to the primary and secondary pressure reducing sections 12 and 13 and the numbers assigned to valves to be described later indicate the input pressure and the output (reduced pressure) pressure, respectively.
[0012]
The primary side decompression unit 12 is provided with a relief mechanism when the pressure of the decompressed gas reaches a predetermined pressure or more. As the relief mechanism, a relief valve 12b composed of an angle valve arranged on the output side of the primary pressure reducing unit 12 is used. Relief valve 12b is to be released into the atmosphere the excess pressure of the gas when it reaches the pressure of the high 5.0 Kg / cm ² than 2.5 Kg / cm ² is the pressure is reduced in the primary side pressure reducing portion 12 I can do it.
[0013]
A secondary pressure reducing unit 13 is disposed on the side to which the gas decompressed to a predetermined pressure (2.5 kg / cm ² ) by the primary pressure reducing unit 12 is disposed, but before the secondary pressure reducing unit 13. , A heat exchange unit 14 is disposed.
The heat exchange unit 14 is configured by connecting a series of finned tubes that can be brought into contact with the atmosphere and do not require a power source or a heat source for heating, are set to a predetermined length, and are thermally insulated in the primary side decompression unit 12. The temperature of the gas whose temperature has been reduced by expansion is adjusted to the ambient temperature of the use environment. The finned tube that constitutes the heat exchange unit 14 is set to have a length that passes through at least one turnover as the gas passage length, and in this embodiment, is set to a length that passes through five turns. Have been. As described above, the length of the passage including the folded portion is set in consideration of the ability to transfer the heat necessary for regenerating the temperature and preventing the height of the gas supply device 7 from being increased.
[0014]
An emergency shutoff unit 15 is connected to a gas discharge unit in the heat exchange unit 14.
The emergency shutoff unit 15 includes a check valve 16, a balance valve 17, and a shutoff valve 18 arranged in a pipe communicating with the gas discharge unit in the heat exchange unit 14.
When the pressure of the gas discharged from the heat exchange unit 14 after being reduced in pressure by the primary side pressure reducing unit 12 reaches a predetermined pressure or more, the balance valve 17 causes the gas itself at that pressure to act on the shutoff valve 18, and the shutoff valve 18 Can be operated to close the pipeline. The operating characteristics of the balance valve 17 include a state in which the pipe opening / closing member of the shut-off valve 18 is not operated when a gas pressure of 2.5 kg / cm ² , which is reduced by the primary-side pressure reducing unit 12, is loaded. When a predetermined pressure of 4.5 kg / cm ^{2, which} is higher than the gas discharge pressure at the primary-side depressurizing section 12, acts, the gas at that pressure is supplied to the shut-off valve 18 to operate the line opening / closing member. It has been.
The predetermined pressure set in the balance valve 17 is a withstand pressure in a pipe from the gas output part (discharge part) of the primary pressure reducing part 12 through the heat exchange part 14 to the gas input part of the secondary pressure reducing part 13. (5.0 K / cm ² ), and the secondary side decompression from the gas discharge part (output side) of the primary side decompression part 12 including the destruction of the finned tube constituting the heat exchange part 14. This is to prevent breakage of the piping section between the section 13 and the gas input section.
[0015]
The shut-off valve 18 is disposed in a pipe upstream of the primary pressure reducing unit 12, and is configured by an on-off valve provided with a pipe opening / closing member (not shown) therein, and a gas pressure acting on the balance valve 17. When the pressure reaches a predetermined pressure, the gas supply line to the primary-side decompression unit 12 is closed by operating the pipeline opening / closing member, and the gas is shut off.
[0016]
A part of a pipe leading to the shutoff valve 18 is branched to the emergency shutoff section 15, and a warning member 19 and an atmospheric release section 20 are connected to the branched pipe.
Although the details are not shown, in the case of the present embodiment, the warning member 19 has a window provided at the end of the conduit, and has a configuration in which a warning indicator is fitted inside the window. . The warning indicator normally exposes the green film from the window to the outside when the pressure of the gas discharged from the heat exchange unit 14 and input to the secondary pressure reducing unit 13 is equal to or lower than a predetermined pressure. When the pressure of the gas input to the secondary pressure reducing unit 13 reaches a predetermined pressure or more, the gas having the pressure causes the red sphere to protrude from the green film and to be exposed from the window.
[0017]
The atmospheric discharge unit 20 is configured by an on-off valve, and is opened when the gas supply to the input side of the primary pressure reducing unit 12 is cut off and then released when the gas cutoff state to the primary pressure reducing unit 12 is released. The gas acting on 17 and the shutoff valve 18 is released to the atmosphere.
[0018]
On the other hand, the pipe of the gas discharged from the heat exchange section 14 is branched into a path toward the secondary pressure reducing section 13 in addition to the path toward the emergency cutoff section 15 described above, and a path toward the secondary pressure reducing section 13. Is provided with a coupler 51 corresponding to a second connection portion. The coupler 51 corresponding to the second connection portion can take out and introduce a pressure (2.5 kg / cm ² ) corresponding to the supply pressure to the intermediate pressure pipe, which is a predetermined pressure reduced by the primary-side pressure reducing portion 12. In the case of removal, gas can be supplied to a supply destination receiving gas from the medium pressure pipe 1 ′ (see FIG. 2). A gas of a pressure to be decompressed, in this case, a gas decompressed to a supply pressure to a meter stand 5 (see FIG. 1) in a private area can be supplied.
[0019]
The secondary-side pressure reducing unit 13 is provided to reduce the pressure of the gas reduced by the primary-side pressure reducing unit 12 to a pressure at a supply destination such as a general home, and a predetermined pressure reduced by the primary-side pressure reducing unit 12. (2.5 Kg / cm ² ) at a predetermined pressure to be in an open state.
On the side from which the gas decompressed by the secondary side decompression section 13 is discharged, a relief valve 21 for dispersing the gas to the atmosphere when excessive pressure acts is arranged.
The relief valve 21 releases excess gas to the atmosphere when the discharge pressure of the gas depressurized by the secondary-side depressurization unit 13 reaches a pressure (390 mmAq) higher than a predetermined depressurized pressure of 240 mmAq, and further releases the excess gas to the atmosphere. Shut off gas when elevated to high pressure (410 mmAq). Conversely, the relief valve 21 has a function of shutting off the gas even when the pressure of the reduced gas reaches 150 mmAq or less, which is lower than the reduced pressure. The function of the relief valve 21 is to prevent the pressure in the secondary side pressure reducing section 13 from abnormally increasing, and to prevent incomplete combustion of gas at the supply destination when the pressure is abnormally decreased. This is intended to prevent the occurrence of a problem in advance, so that a countermeasure can be taken when an abnormal change occurs ⁱⁿ the supply pressure.
[0020]
A fuse plug 22 is connected to a gas discharge part of the secondary pressure reducing unit 13.
The fuse plug 22 is provided with an opening / closing valve provided to prevent a secondary disaster from occurring when raw gas is directly blown out in an emergency when the connection portion comes out, that is, when it comes off. When the flow rate of the gas discharged from the side pressure reducing section 13 exceeds 6 Nm ³ / h, the gas outlet side pipeline can be shut off.
The fuse plug 22 is provided with an on-off valve 22a corresponding to an outlet valve. The on-off valve 22a is closed when the output-side pipe line is closed by the fuse plug 22, and a supply path to the output side is provided. It is closed again after the gas is released to the atmosphere in the atmosphere release section. Further, near the fuse plug 22, a pressure gauge 23 for detecting the pressure in the pipe is connected.
[0021]
Since the present embodiment is configured as described above, the gas supply control unit 9 is mounted on the trolley 8, while the cylinder 10 filled with the required amount of city gas at the required pressure is set in the gas supply unit 11. The hose located on the input side of the gas supply controller 9 is connected to the cylinder 10.
The cart 8 on which the gas supply control unit 9 and the cylinder 10 are mounted is transported to a supply destination where gas supply is required, as shown in FIGS.
That is, in the case of the gas supply system shown in FIG. 1, in the vicinity of the meter stand tube 5 communicating with the service pipe 2, and in the case of the gas supply system shown in FIG. Further, in the case of the gas supply method shown in FIG. 3, the gas is conveyed to the vicinity of the meter stand 5 and the medium pressure pipe 1 'closest to the meter stand 5.
[0022]
When the cart 8 is transported to the supply destination, the coupler 50 that is located on the output side of the supply path in the gas supply control unit 9 and forms the first connection unit is connected to a meter standpipe (a member indicated by reference numeral 5 in FIG. 1). And the case where the coupler 51 forming the second connection portion is connected to the intermediate pressure tube 1 'is selected.
When the gas supply system according to the present embodiment is applied to the gas supply system shown in FIG. 1, the input side of the supply path in the gas supply control unit 9 is connected to the cylinder 10, and the first connection unit on the output side. When the coupler 50 is connected to the meter stand 5, gas supply is started.
[0023]
When the gas is supplied, the gas supply control unit 9 checks the pressure in the cylinder 10 by the pressure gauge 11b of the gas supply unit 11, and when the pressure is usable, one of the on-off valves 11c is opened. The on-off valve corresponding to the outlet valve indicated by reference numeral 22a in FIG. 5 is opened.
When the on-off valve 11c is opened, gas is supplied from the cylinder 10 on the selected side to the input side of the gas supply control unit 9.
[0024]
In the gas supply control unit 9 is supplied to the gas primary pressure reducing portion 12 to be discharged from the cylinder 10, which corresponds to the supply pressure from 200 Kg / cm ^2, which is the pressure of the inside cylinder 10 to the intermediate pressure pipe 1 '2. The pressure is reduced to 5 kg / cm ² . Although the temperature of the decompressed gas has been lowered due to adiabatic expansion that occurs at the time of decompression, the gas is adjusted to the ambient temperature of the use environment by passing through the heat exchange unit 14 and is discharged from the heat exchange unit 14.
[0025]
Since the heat exchange unit 14 uses an atmosphere contact structure that does not require a power supply or a heat source for raising the temperature of the gas whose temperature is decreasing, there is no need to provide a factor for igniting the supplied gas. Thereby, safety in gas handling can be ensured. The gas passing through the heat exchange unit 14 is prevented from passing through the pipeline at the temperature lowered by the adiabatic expansion due to the correction of the temperature, thereby preventing the equipment from being damaged due to the temperature drop.
[0026]
On the other hand, when the pressure of the gas depressurized by the primary-side depressurizing section 12 becomes higher than 2.5 kg / cm ² and reaches 4.5 kg / cm ^2, the gas is connected to the primary-side depressurizing section 12 by the emergency cutoff section 15. The input side pipeline is closed and the gas is shut off.
In the emergency shutoff unit 15, when a gas pressure equal to or higher than a specified pressure acts on the balance valve 17, the equilibrium state up to that point is disturbed and the pipe opening / closing member of the shutoff valve 18 is operated, whereby the gas to the primary side pressure reducing unit 12 is reduced. Is closed.
Further, at this time, the warning indicator in the warning member 19 causes the red sphere to be exposed from the window, so that the operation of the emergency shutoff unit 15 can be easily confirmed from the outside. As described above, when a pressure that affects the pressure resistance of the components of the pipeline is generated in the pipeline until the gas discharged from the primary-side vacuum unit 12 is input to the secondary-side vacuum unit 13. Since the supply of gas is shut off in the pipeline, damage to the pipeline from the primary-side depressurizing section to the secondary-side depressurizing section 13 can be avoided beforehand, and the state can be easily confirmed from the outside.
[0027]
The gas decompressed to a predetermined pressure of 2.5 kg / cm ² in the primary decompression unit 12 is supplied to the secondary decompression unit 13 only when the gas is at the predetermined pressure, and 240 mmAq is used as the working pressure at the supply destination. The pressure is reduced. In this case, the coupler 51 corresponding to the second connection portion is closed, and the state in which gas cannot be discharged is maintained.
In the secondary pressure reducing unit 13, when the pressure of the gas to be input becomes higher than 2.5 kg / cm ² and reaches 4.5 kg / cm ² , the gas at that pressure acts on the emergency shut-off unit 15. The gas is shut off. In addition, when the pressure of the gas depressurized by the secondary-side depressurization unit 13 reaches 390 mmAq, the excess gas is released to the atmosphere by the relief valve 21 and the gas pressure further increases to reach 410 mmAq, and The gas is also shut off when the pressure of the gas depressurized in the secondary side depressurization unit 13 is lower than 150 mmAq which is less than a predetermined pressure. Thus, the decompressed gas is supplied to the fuse plug 22 only when the decompression pressure is maintained at a predetermined decompression pressure. Since the pressure at this time is detected by the pressure gauge 23, it can be monitored from the outside.
[0028]
The gas set to the final pressure at the supply destination by the secondary pressure reducing unit 13 is supplied to the gas supply destination by the fuse plug 22, in this case, a general household using the pressure reduced by the secondary pressure reducing unit 13. Is supplied to the supply destination.
When the flow rate of the gas depressurized by the secondary pressure reducing unit 13 exceeds a predetermined value (6 Nm ³ / h), the gas outlet side pipe line is closed by the fuse plug 22 and the gas supply is shut off. . Thus, in an emergency such as a disconnection of the connecting portion, the raw gas supplied from the secondary-side pressure reducing section 13 is prevented from being spouted, so that a secondary disaster is not caused.
[0029]
On the other hand, when the gas supply system according to the present embodiment is applied to the gas supply system shown in FIG. 2, the pressure is reduced in the primary side pressure reducing unit 12 and the supply pressure to the medium pressure pipe 1 ′, in this case, 2. In order to supply the gas set at 5 kg / cm ² not from the coupler 50 corresponding to the first connection part but from the coupler 51 corresponding to the second connection part to the medium pressure pipe 1 ′, the coupler 51 'Attached to. As a result, the gas from the cylinder 10 in the gas supply unit 11 is supplied from the coupler 51 to the medium pressure pipe 1 ′ before reaching the secondary pressure reducing unit 13.
[0030]
When the gas supply system according to the present embodiment is applied to the gas supply system shown in FIG. 3, a gas is introduced from the coupler 51 corresponding to the second connection portion, and the gas is decompressed on the secondary side. In the section 13, the pressure is reduced to a predetermined pressure (240 mmAq), and gas at the predetermined pressure is supplied to the meter stand 5.
In this case, the coupler 51 is attached to the medium-pressure tube 1 ′, while the coupler 50 corresponding to the first connection portion is attached to the meter stand 5.
When the pressure of the gas depressurized by the secondary pressure reducing unit 13 reaches 390 mmAq corresponding to the working pressure at the supply destination or more, the excess pressure is released to the atmosphere by the relief valve 21 as described above. Further, when the pressure of the decompressed gas reaches 410 mmAq, which is equal to or higher than the atmospheric pressure, and when the pressure becomes lower than 150 mmAq, the gas is shut off.
In such a gas supply system using an existing pipeline, the gas can be diverted between the low-pressure pipe 1 and the medium-pressure pipe 1 ′, which has not been used conventionally, and the gas supply source to the supply destination is There is no limitation due to differences in pressure. For this reason, in the event of an emergency such as restoration work of a pipeline, there are many choices of supply sources for securing a simple gas supply, which is convenient.
[0031]
On the other hand, as a mode for simply supplying gas from the cylinder 10 which is a high-pressure container provided in the gas supply device 7, as described above, the gas can be used at the supply destination when the existing piping cannot be used. In addition to the above, there is a form used for an airtight test.
When the airtightness test is performed on the service pipe (the pipe indicated by reference numeral 2 in FIG. 1) drawn from the low-pressure pipe 1, the supply to the supply pipe normally set by each of the decompression units 12 and 13 is performed. An airtightness test pressure higher than the pressure is applied to the gas, and the gas is supplied from the coupler 50 as the first connection portion toward the service pipe. When the airtight test is completed, it is not necessary to purge the inside of the service pipe simply by reducing the pressure of the gas supplied into the service pipe to the supply pressure set normally. This eliminates the need for the purging operation conventionally performed when air is used, so that a waste time until the gas is used after the airtight test is omitted, and the time until the gas supply is restarted is shortened. It becomes possible.
[0032]
【The invention's effect】
As apparent from the above description, according to the first aspect of the present invention, the emergency shutoff unit that controls the supply of gas to the primary-side depressurizing unit, the first connection unit that can be connected to the supply destination, and the supply Since a second connection portion capable of extracting and introducing a gas having a pressure higher than the previous pressure is provided, when the emergency shut-off portion is controlled to be opened and closed by the pressure of the gas from the primary pressure reducing portion, a high pressure is required. The gas from the container can be supplied to either the first connection or the second connection, and when the gas is introduced into the second connection, the gas is supplied from the second connection. It can be supplied to the first connection. Therefore, the gas can be supplied to the first connection portion by selecting either the high-pressure vessel or the existing pipe. Thus, unlike the conventional gas supply system, work such as temporary installation and removal of the bypass passage is not required, and it is possible to prevent the work time for replacing or repairing the pipeline from being lengthened. In addition, when a pressure equal to or higher than a predetermined pressure is supplied by the emergency shutoff unit for some reason, the gas is shut off by the emergency shutoff unit. It is possible to prevent a gas at a pressure from being supplied to a supply destination. This makes it possible to optimize the supply pressure at the time of supply and to enhance safety in security.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for explaining an example of a gas supply system using a gas supply system according to the present invention.
FIG. 2 is a schematic diagram for explaining another example of the gas supply system using the gas supply system according to the present invention.
FIG. 3 is a schematic diagram for explaining another example of the gas supply system using the gas supply system according to the present invention.
FIG. 4 is an external view of a gas supply device used in the gas supply system according to the present invention.
FIG. 5 is a block diagram illustrating a configuration of a gas supply control unit included in the gas supply device illustrated in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Low-pressure pipe 1 'Medium-pressure pipe 2 Serving pipe 7 Gas supply device 9 Gas supply control unit 10 Cylinder forming a high-pressure vessel 12 Primary-side decompression unit 13 Secondary-side decompression unit 14 Heat exchange unit 15 Emergency shut-off unit 50 Coupler equivalent to the section 51 Coupler equivalent to the second connection section

Claims (1)

In a gas supply path in which a high-pressure container filled with gas is located on the input side and a first connection portion connectable to a gas supply destination is located on the output side,
A plurality of the high-pressure vessels are arranged on the input side, and gas in one high-pressure vessel selected from the plurality of high-pressure vessels is taken in,
The pressure of the gas taken in from the high-pressure vessel is reduced to a final pressure used at the gas supply destination by a plurality of pressure reducing units,
The gas passing between the pressure reducing sections is introduced into the heat exchange section to perform a temperature correction process,
In the gas supply path behind the heat exchanging section, a second connecting section capable of taking out and introducing a gas having a pressure higher than the gas pressure taken out of the first connecting section is provided separately from the first connecting section. ,
Providing an emergency shut-off unit capable of shutting off gas supply to the primary-side depressurizing unit of the plurality of stages of depressurizing units when the gas discharge pressure from the heat exchange unit is equal to or higher than a predetermined pressure,
When the gas is taken in from the high-pressure vessel and the gas is supplied to the supply destination, the emergency shut-off unit is controlled to open and close by the pressure of the gas discharged from the heat exchange unit, and the gas is introduced from the second connection unit. A gas supply system for supplying gas from the second connection part to the first connection part.

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