JP7012565B2 - Gas supply method and gas supply system - Google Patents

Description

The present invention relates to a gas supply method and a gas supply system, and more particularly to a gas supply method and a gas supply system capable of supplying a predetermined gas to a pipeline.

Conventionally, it has been known that a gas meter needs to be replaced not only when a malfunction such as a failure occurs but also when the certification expires (for example, 10 years).

Replacing such a gas meter is, for example,
(1) "Close" the meter cock provided on the upstream side of the gas meter to stop the supply of gas to the gas meter.
(2) Next, after removing the existing gas meter, install a new gas meter.
(3) After that, work to restore the dormant gas meter, work to open the meter cock, etc. are performed, and gas is supplied to the piping on the downstream side of the gas meter.
(4) Then, using a gas consuming device (for example, a gas stove) installed in the house or the like, the air in a new gas meter or the like is exhausted (air purge) while burning the gas.
It is done by following the procedure.

That is, when replacing a gas meter, it is generally done in the presence of a customer because the use of gas consuming equipment installed in the house or the like is temporarily restricted.

However, even if the worker goes to the appointment date and time with the customer to replace the gas meter, the customer is absent, or there is a customer, for example, it takes time to stop completely. It is not uncommon for the required gas consuming equipment to be in operation.

In such a case, the worker cannot immediately replace the gas meter, which causes a problem that the work efficiency is lowered.

Therefore, in order to solve such a problem, by providing a bypass pipe that connects the pipe on the upstream side and the pipe on the downstream side of the gas meter, gas can be supplied to the pipe on the downstream side without going through the gas meter. (See Patent Document 1).

According to such a technique, the gas meter can be replaced without stopping the supply of gas to the gas consuming device, so that it is possible to omit the customer's presence as described above.

Japanese Unexamined Patent Publication No. 60-001526

However, the technique of Patent Document 1 allows gas to flow through the bypass pipe to pass through the gas meter not only during "working" when the gas meter is replaced but also during "normal time" when such work is not performed. It is possible to supply gas to gas consuming equipment.

In this respect, the technique of Patent Document 1 is effective in terms of efficiency of gas meter replacement work, but it can be said that another problem such as gas theft may occur.

By the way, as a case of closing a valve (for example, a meter cock) arranged in a gas pipe, there is a case of replacing a gas meter as described above, a case of repairing a pipe on the downstream side of the gas meter, and the like.

Even in such a case, the gas consuming equipment cannot be used while the pipe is being repaired, and the air in the gas pipe must be exhausted (air purge) after the work is completed. Therefore, there is a problem that is not different from the problem at the time of replacing the gas meter as described above.

In this regard, it is possible to perform such work without stopping the supply of gas to the gas consuming equipment in all the work in which air is mixed inside the pipe as well as the work of replacing the gas meter. It can be said that the development of technology is desired.

The present invention has been made to solve such a problem, and an object thereof is that there is no risk of gas theft and even during the construction of a pipeline (for example, replacement of a gas meter). It is an object of the present invention to provide a gas supply method and a gas supply system capable of continuously supplying gas.

The above-mentioned problem is a gas supply method for supplying a predetermined gas to a pipeline according to the gas supply method according to the present invention, and a gas storage device capable of storing the gas is arranged in the pipeline. From the gas storage device connection step connected to the connection portion, the gas supply step of supplying the gas stored in the gas storage device through the connection portion to the pipeline, and the connection portion in the pipeline. Is also solved by including an on-off valve closing step of closing the on-off valve disposed on the upstream side.

Further, according to the gas supply system according to the present invention, it is a gas supply system that supplies a predetermined gas to a pipeline, and stores an on-off valve arranged in the pipeline so as to be openable and closable, and the gas. A gas storage device capable of being provided is provided, and the gas storage device is detachably provided with respect to a connection portion disposed on the downstream side of the on-off valve in the pipeline, and is provided via the connection portion. It is also solved by supplying the stored gas to the pipeline.

The "predetermined gas" (hereinafter, simply referred to as "gas") is not limited to city gas and propane gas, but is chlorine-based gas (for example, trichloroethylene methylene chloride (methylene chloride)) and fluorine-based gas. Gas (for example, HCFC (hydrochlorofluorocarbon)), bromine-based gas (for example, 1-bromopropane), alcohol-based gas (methanol (methyl alcohol)) and the like are included.

In the above configuration, the worker who performs the work such as replacement of the gas meter
(1) A "gas storage device" is connected to a "connection site" arranged at a predetermined position (downstream side of the "on-off valve") of a "pipeline" (for example, a gas pipe).
(2) Next, the "gas" stored in the "gas storage device" is supplied to the "pipeline" via the "connection site", and the on-off valve arranged on the upstream side of the "connection site" ( For example, the valve provided on the downstream side of the gas meter) is closed.
It is configured to take steps such as.

That is, in the above configuration, even if the "off-off valve" is closed to construct the "pipeline", "gas" is continuously supplied to the "pipeline" on the downstream side without any change. Is possible.

Further, in the above configuration, the "gas" that will be consumed (used) by the gas consuming device during the period of closing the "off-off valve" (for example, during the scheduled work time required for replacing the gas meter) is "gas" in advance. It is configured to be stored in a "gas storage device" and to supply the stored "gas" to the "pipeline" while the "on-off valve" is actually closed.
That is, in the above configuration, not only while the "on-off valve" is open, but also when it is closed, the properly acquired gas is supplied to the "pipeline", so that the gas is stolen. No problem arises.

Summarizing these, the present invention provided with the above configuration has no risk of gas theft, and it is possible to carry out the construction of the pipeline without stopping the flow of gas.

In the invention relating to the gas supply method, it is preferable that the gas storage device contains an adsorption member for adsorbing the gas, and the gas storage device is described before the gas supply step is performed. It is preferable to perform a gas storage step of storing the gas flowing in the pipeline through the connection portion in the gas storage device.

Similarly, in the invention relating to the gas supply system, it is preferable that the gas storage device contains an adsorption member for adsorbing the gas, and the pipe via the connection portion. It is preferable to store the gas flowing in the path and supply the stored gas to the pipeline.

The "adsorption member" referred to here is a material that adsorbs "gas" supplied to the "pipeline", specifically, has a porous structure having a large surface surface and has an ability to adsorb "gas". Good materials, such as those formed of activated carbon, zeolite, silica gel, clay minerals, metal oxides, porous glass, are applicable.

Here, when the "gas storage device" is configured to be capable of "storing the gas flowing in the pipeline through the connection portion", the pressure of the "gas" flowing in the "pipeline" is sufficient. It is desirable to use a resin-made or metal-made container (for example, a pressure vessel) capable of withstanding the above-mentioned "suction member" and accommodating the above-mentioned "adsorption member" inside.

By the way, as a method of efficiently storing "gas" in a "gas storage device" in which an "adsorption member" is housed, for example,
(1) A method of sucking "gas" into a "gas storage device" that has been decompressed in advance (a state of a space lower than atmospheric pressure).
(2) A method of pumping "gas" to a "gas storage device" using a pressurizing device such as a pump.
Can be considered. If the pressure of "gas" is increased by using a pressurizing device, it can be expected that the amount of "gas" adsorbed on the "adsorbed material" will increase, and in such a case, more "gas" can be stored. It will be possible.

In this respect, the "gas storage device" has a structure that does not deform even in a depressurized state and can store a high-pressure (for example, 10 MPa) "predetermined gas". It can be said that it is preferable.
By doing so, it is possible to sufficiently cope with a wide range of work environments and to make it highly versatile.

As described above, according to the present invention provided with the above configuration, by accommodating the "adsorption member" that adsorbs "gas" in the "gas storage device", a relatively large capacity is not accompanied by an increase in size of the device. It is possible to store the "gas" of.
In this respect, in the above configuration, since it is possible to carry out the construction of the "pipeline" using a relatively small "gas adsorption container", it can be said that the labor of the worker can be surely reduced.

In the invention relating to the gas supply method, a second on-off valve closing step for closing the second on-off valve arranged on the upstream side of the on-off valve in the pipeline, the on-off valve closing step, and the above-mentioned on-off valve closing step. After performing the second on-off valve closing step, it is preferable to include a dividing step of dividing the connecting pipeline connecting the on-off valve and the second on-off valve in the pipeline. In this case, it is more preferable to include a step of removing the gas meter arranged in the connecting pipeline.

Further, in the invention according to the gas supply method, the on-off valve is configured to be electrically openable and closable, and is a detecting means for detecting whether or not the gas is supplied from the gas storage device to the pipeline. And a control means for controlling the opening / closing operation of the on-off valve based on the detection result by the detection means, and the on-off valve is closed in the on-off valve closing step from the gas storage device by the detection means. When it is detected that the gas is supplied to the pipeline, it is preferable that the gas is controlled by the control means.

As described above, according to the gas supply method and the gas supply system according to the present invention, although the configuration is relatively simple, there is no risk of gas theft and the flow of the gas is not stopped. Construction can be done.

It is explanatory drawing which shows an example of the gas supply system which concerns on this Embodiment, and is the figure which shows the state which gas is stored in the gas adsorption container. It is explanatory drawing which shows the state after FIG. 1, and is the figure which shows the state which supplies the gas stored in a gas adsorption container to a gas pipe. It is explanatory drawing which shows the state after FIG. 2, and is the figure which shows the state which recovers the residual gas existing in the inside of a gas meter or the like. It is explanatory drawing which shows the state after FIG. 3, and is the figure which shows the state which exchanges a gas meter. It is explanatory drawing which shows the state after FIG. 4, and is the figure which shows the state which exhausts the air existing in the inside of a gas meter or the like. It is explanatory drawing which shows the state after FIG. 5, and is the figure which shows the state which the replacement work of a gas meter is completed. It is a perspective view of the gas adsorption container which concerns on this embodiment. It is a flow chart of the gas supply method which concerns on this embodiment.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an example of a gas supply system according to the present embodiment, and FIG. 1 is a diagram showing a state in which gas is stored in a gas adsorption container, and FIG. 2 is an explanatory diagram showing a state after FIG. A diagram showing a state in which the gas stored in the gas adsorption container is being supplied to the gas pipe, FIG. 3 is an explanatory diagram showing a state after FIG. 2, and is a residual gas existing inside a gas meter or the like. FIG. 4 is an explanatory diagram showing a state after FIG. 3, showing a state in which the gas meter is being replaced, and FIG. 5 is an explanatory diagram showing a state after FIG. FIG. 6 is a diagram showing a state in which air existing inside a gas meter or the like is excluded, and FIG. 6 is an explanatory diagram showing a state after FIG. 5, showing a state in which the replacement work of the gas meter is completed. FIG. 7 is a perspective view of a gas adsorption container, and FIG. 8 is a flow chart of a gas supply method according to the present embodiment. In the following, "GMa" refers to an old gas meter before gas meter replacement (hereinafter referred to as "old gas meter"), and "GMb" refers to a new gas meter after gas meter replacement (hereinafter referred to as "new gas meter"). If it is not necessary to distinguish between the "old gas meter" and the "new gas meter" for the sake of explanation, it will be clearly stated as "gas meter GM".

1 to 6 show in time series how the gas meter GM is replaced by using the gas supply system 1 according to the present embodiment. The gas supply system 1 corresponds to the "gas supply system" described in the claims.

Before explaining the configuration of the gas supply system 1 according to the present embodiment, the gas meter GM and the pipes around it (primary side pipe 51 and secondary side pipe 52) will be described with reference to FIGS. 1 to 6. The primary side pipe 51, the secondary side pipe 52, and the portion where the gas flows inside the gas meter GM correspond to the "pipeline" described in the claims.

As shown in FIGS. 1 to 6, the gas meter GM according to the present embodiment is arranged outdoors in the same manner as that of a normal (known) one, and the primary side pipe 51 and the secondary side pipe 52 are arranged on the upper surface thereof. A primary side piping port (not shown) and a secondary side piping port (not shown) are provided, which are connected to each other. The gas meter GM according to the present embodiment also measures the consumption of gas (city gas in the present embodiment) in the same manner as the known one, and has a meter certification expiration date (for example, 10 years). Has been done.

Both the primary side piping port and the secondary side piping port are provided with the primary side piping 51 and the primary side piping port by tightening the pipe joints (so-called "fukuro") 53, 53 with rubber packing (not shown) interposed therebetween. It is designed to be connected to the secondary side pipe 52.

The primary side pipe 51 is a pipe for leading the gas supplied from the main gas supply line to the gas meter GM, and moves around the gas meter GM to a predetermined position between the open position and the closed position. An operable primary valve (so-called meter cock) 54 is provided. The gas and the primary valve 54 correspond to the "predetermined gas" and the "second on-off valve" described in the claims, respectively.

The secondary side pipe 52 is connected to a gas consuming device (for example, a gas stove or a so-called household fuel cell system) installed indoors or the like, and is a pipe for supplying gas to the gas consuming device. Further, around the gas meter GM of the secondary side pipe 52, a secondary side valve 55 that can be moved between the open position and the closed position is provided at a predetermined position. The secondary valve 55 corresponds to the "off-off valve" described in the claims.

In the secondary side pipe 52, the upstream side branch pipe 56 and the downstream side branch pipe 57 are branched and connected to the upstream side and the downstream side of the secondary side valve 55, respectively. Further, on each open end side of the upstream branch pipe 56 and the downstream branch pipe 57, an upstream branch valve 58 and a downstream branch valve 59 that can be moved between the open position and the closed position are provided, respectively. Has been done. The downstream branch pipe 57 and the downstream branch valve 59 correspond to the "connection portion" described in the claims.

Next, the gas supply system 1 will be described with reference to FIGS. 1 to 7.
As shown in FIGS. 1 to 6, the gas supply system 1 includes a first gas adsorption container 2A and a second gas adsorption container 2B in addition to the primary side valve 54 and the secondary side valve 55. The first gas adsorption container 2A corresponds to the "gas storage device" described in the claims.

Both the first gas adsorption container 2A and the second gas adsorption container 2B are adsorption materials Am capable of adsorbing gas inside the first gas adsorption container 2A (in this embodiment, activated carbon, "adsorption" described in the scope of the patent claim. (Corresponding to "member") is filled (see FIG. 7). The adsorption material Am is preferably formed by a porous structure having a large surface area in consideration of the gas adsorption capacity, and the material is not limited to activated carbon, depending on the type of gas to be adsorbed and the like. , Other materials such as zeolite and silica gel can also be used. The first gas adsorption container 2A and the second gas adsorption container 2B can be formed of, for example, a resin (for example, polyethylene) or a metal.

As will be described later, the first gas adsorption container 2A "temporarily" stores the gas flowing in the secondary side pipe 52, and then stores the stored gas as a secondary while closing the secondary side valve 55. It is for supplying (returning) to the side pipe 52. The second gas adsorption container 2B is for recovering the gas remaining in the primary side pipe 51, the secondary side pipe 52, and the old gas meter GMa before replacing the gas meter GM. Since both the first gas adsorption container 2A and the second gas adsorption container 2B have the same configuration, the first gas adsorption container 2A will be described below, and the same “1st gas adsorption container 2A” will be described unless necessary. "Number" is added and the explanation is omitted.

As shown in FIG. 7, the first gas adsorption container 2A has a pipe 3A communicating with the inside thereof and a cock 4A connected to the opening end side of the pipe 3A. The cock 4A is configured to be movable between the closed position and the open position, and is connected to the secondary side pipe 52 via a pressure resistant hose 71 or a pressure supply system 60, which will be described later (). See FIGS. 1 and 2). Further, the second gas adsorption container 2B also has a pipe 3B and a cock 4B like the first gas adsorption container 2A, and is configured to be connected to the secondary side pipe 52 via a pressure resistant hose 72 described later. (See Fig. 3 etc.).

Next, a procedure for using the gas supply system 1 configured as described above (a work procedure according to the gas supply method according to the present embodiment) will be described with reference to FIGS. 1 to 8.

As shown in FIG. 8, the gas supply method according to the present embodiment includes a first gas adsorption container connection step A, a gas storage step B, a gas supply step C, a secondary valve closing step D, and a primary side. It includes a valve closing step E, a gas recovery step F, a gas meter replacement step G, a primary side valve opening step H, an air purging step I, and a secondary side valve opening step J. The first gas adsorption container connection step A, the gas storage step B, the gas supply step C, and the gas meter replacement step G are each described as the "gas storage device connection step" described in the scope of the patent claim. , "Gas storage process", "gas supply process", and " dividing process", and the secondary side valve closing process D and the primary side valve closing process E are described in the scope of the patent claim. It corresponds to "valve closing process" .

(First gas adsorption container connection step A)
First, the first gas adsorption container connection step A will be described with reference to FIG.
As shown in FIGS. 1 and 7, in the first gas adsorption container connecting step A, the work of connecting the first gas adsorption container 2A to the secondary side pipe 52 is performed.
Specifically, the work of connecting the cock 4A of the first gas adsorption container 2A and the downstream side branch valve 59 provided in the secondary side pipe 52 (downstream side branch pipe 57) via the pressure resistant hose 71. Do it.

In the present embodiment, as the first gas adsorption container 2A and the second gas adsorption container 2B, those in a "vacuum state" (a state lower than the atmospheric pressure) are used in advance. It should be noted that such a "vacuum state" can be realized, for example, by using a vacuum pump or the like before performing the first gas adsorption container connecting step A (for example, before arriving at the work place (site)). It is possible.

Thereby, in the present embodiment, it is as if the fluid (gas and / or air) in the secondary side pipe 52 is pressurized by such an electric device without preparing an electric device such as an electric pump. It is possible to make the fluid flow into the first gas adsorption container 2A (second gas adsorption container 2B). In the present embodiment, the first gas adsorption container 2A (second gas adsorption container 2B) is set to the "vacuum state" in advance, but it is not necessary to do so. In this case, an electric device as described above may be used as needed.

The first gas adsorption container connection step A is completed by connecting the first gas adsorption container 2A to the secondary side pipe 52, and then the gas storage step B, which is the next step, is performed. In the state where the first gas adsorption container connecting step A is performed, both the primary side valve 54 and the secondary side valve 55 are in the "open" state, so that the gas consuming equipment has the primary side piping. Gas is supplied via 51, the old gas meter GMa, and the secondary side pipe 52.

(Gas storage step B)
As shown in FIGS. 1 and 7, in the gas storage step B, the work of storing gas in the first gas adsorption container 2A is performed.
Specifically, the work of changing the downstream branch valve 59 on the secondary side pipe 52 side and the cock 4A on the first gas adsorption container 2A side from the "closed" state to the "open" state is performed.
As a result, the gas flowing through the secondary side pipe 52 is sucked (inflowed) into the first gas adsorption container 2A via the pressure resistant hose 71, and is effectively adsorbed by the adsorption material Am filled therein. Will be.

Here, the gas stored in the first gas adsorption container 2A is the time for closing at least one of the primary side valve 54 and the secondary side valve 55 (that is, the construction time, in the present embodiment, the gas meter GM. It can be determined according to the replacement) and the total consumption of gas consuming equipment used in the house or the like per hour.

For example, assuming that the scheduled construction time is "30 minutes" and the total gas consumption per hour of the gas consuming equipment used in the house or the like is "200 to 300 L", the first gas adsorption container 2A The amount of gas to be stored in the container is at least "100 to 150 L".
Further, if a safety value of, for example, about "30%" to "50%" is expected for this value, the amount of gas stored in the first gas adsorption container 2A can be obtained as "200L".
That is, the first gas adsorption container 2A may be appropriately selected and brought to the work place with an optimum capacity capable of storing the gas storage amount calculated in this way.

The gas storage step B is completed by storing a predetermined amount of gas in the first gas adsorption container 2A, and then the next step, the gas supply step C, is performed.

(Gas supply process C)
As shown in FIGS. 2 and 7, in the gas supply step C, the work of supplying the gas stored in the first gas adsorption container 2A in the gas storage step B to the secondary side pipe 52 is performed.
Specifically, the cock 4A on the first gas adsorption container 2A side and the downstream branch valve 59 on the secondary side pipe 52 side are connected via the pressurization supply system 60, and then the pressurization supply system 60. Is used to supply (send) the gas stored in the first gas adsorption container 2A to the secondary side pipe 52.

Here, the pressure supply system 60 will be described. The pressure supply system 60 has a pressure regulator 64, and the gas stored in the first gas adsorption container 2A flows in the secondary side pipe 52. It is a device for supplying to the secondary side pipe 52 after adjusting the pressure so that it becomes almost the same as the gas, and includes a pressurizing pump 61, a pressure gauge 62, and a pressure adjusting tank (accumulator) 63. , A pressure regulator 64 and the like.

Since such a pressure supply system 60 is now known, detailed description thereof will be omitted, but also in the present embodiment, in order to supply gas of a predetermined pressure to the secondary side pipe 52, a worker can use a pressure gauge. It is configured to adjust the pressure regulator 64 while checking 62.

Since the primary side valve 54 and the secondary side valve 55 are both in the "open" state in the state where the gas supply step C is performed, the gas consuming equipment includes the primary side pipe 51 and the gas meter GM. Gas is supplied from two systems, that is, a system via the first gas adsorption container 2A and a system via the pressurized supply system 60. It should be noted that such a supply state is a "temporary" state that is performed so as not to stop the gas supply to the gas consuming device, and the gas consumption is performed in the state where the "primary side valve closing step E" described later is performed. Gas is supplied to the device only from the system via the first gas adsorption container 2A and the pressurized supply system 60.

The gas supply step C is completed by sending the gas stored in the first gas adsorption container 2A to the secondary side pipe 52, and then the secondary side valve closing step D is performed.

(Secondary valve closing step D)
As shown in FIG. 2, in the secondary valve closing step D, the secondary valve 55 in the “open” state is manually operated to bring it into the “closed” state.
As a result, the gas is supplied to the gas consuming device only from the system via the first gas adsorption container 2A and the pressurized supply system 60.
The secondary side valve closing step D is terminated by closing the secondary side valve 55 in the “closed” state, and then the primary side valve closing step E, which is the next step, is performed.

(Primary side valve closing step E)
As shown in FIG. 3, in the primary side valve closing step E, the primary side valve 54 in the “open” state is manually operated to bring it into the “closed” state.
As a result, the supply of gas to the old gas meter GMa will be stopped.
The primary side valve closing step E is completed by closing the primary side valve 54 in the “closed” state, and then the gas recovery step F, which is the next step, is performed.

(Gas recovery step F)
As shown in FIGS. 3 and 7, in the gas recovery step F, the pipe on the downstream side of the primary side valve 54 of the primary side pipe 51 and the upstream side of the secondary side valve 55 of the secondary side pipes 51. Work is performed to recover the gas remaining in each of the piping and the old gas meter GMa.

Specifically, the cock 4B of the second gas suction container 2B and the upstream branch valve 58 provided in the secondary pipe 52 (upstream branch pipe 56) are connected via a pressure resistant hose 72, and then Both the upstream branch valve 58 on the secondary side pipe 52 side and the cock 4B on the second gas suction container 2B side are changed from the “closed” state to the “open” state.

Like the first gas adsorption container 2A, the second gas adsorption container 2B is in a "vacuum state" when it is brought into the work place. Therefore, when the upstream branch valve 58 and the cock 4B are opened. , The gas remaining inside the old gas meter GMa or the like is effectively sucked into the second gas adsorption container 2B.
As a result, the gas sucked into the second gas adsorption container 2B is effectively adsorbed (recovered) by the adsorbent material Am filled therein.

In the gas recovery step F, after recovering the gas remaining inside the old gas meter GMa, the upstream branch valve 58 on the secondary side pipe 52 side and the cock 4B on the second gas adsorption container 2B side are “closed”. The state is completed, and then the gas meter replacement step G is performed.

(Gas meter replacement process G)
As shown in FIG. 4, in the gas meter replacement step G, after removing the old gas meter GMa from the primary side pipe 51 and the secondary side pipe 52, the new gas meter GMb is attached to these pipes.
Specifically, after loosening the pipe joints 53 and 53 provided on the primary side pipe 51 and the secondary side pipe 52 with a predetermined jig and removing the old gas meter GMa, these pipes are operated in the reverse procedure. Work to install the new gas meter GMb with the rubber packing intervening in the pipe.
The gas meter replacement step G is completed by attaching a new gas meter GMb to the primary side pipe 51 and the secondary side pipe 52, and then the primary side valve opening step H, which is the next step, is performed.

(Primary side valve opening step H)
As shown in FIG. 5, in the primary side valve opening step H, the primary side valve 54 in the “closed” state is operated to bring it into the “open” state.
As a result, gas is supplied to the pipe downstream of the primary valve 54 of the primary pipe 51, the new gas meter GMb, and the pipe upstream of the secondary valve 55 of the secondary pipe. The Rukoto.
The primary side valve opening step H is completed by opening the primary side valve 54 in the “open” state, and then the next step, the air purging step I, is performed.

(Air purge step I)
As shown in FIGS. 5 and 7, in the air purge step I, both the upstream branch valve 58 on the secondary side pipe 52 side and the cock 4B on the second gas adsorption container 2B side are in the “closed” state to the “open” state. Do the work to do.
As a result, as in the gas recovery step F, the pipe on the downstream side of the primary side valve 54 in the primary side pipe 51, the pipe on the upstream side of the secondary side valve 55 in the secondary side pipe, and The air mixed in the new gas meter GMb is satisfactorily sucked by the second gas suction vessel 2B in the "vacuum state".
As a result, the gas mixed with air sucked into the second gas adsorption container 2B is effectively adsorbed (recovered) by the adsorbent material Am filled therein.

In the air purge step I, after collecting the air mixed in the inside of the new gas meter GMb, the upstream branch valve 58 on the secondary side pipe 52 side and the cock 4B on the second gas suction container 2B side are in the “closed” state. The process is completed by removing the second gas suction container 2B from the secondary side pipe 52, and then the secondary side valve opening step J is performed. In the present embodiment, in the air purge step I, the second gas adsorption container 2B used in the gas recovery step F is used as it is, but another gas adsorption container may be used.

(Secondary valve opening process J)
As shown in FIGS. 6 and 7, in the secondary valve opening step J, after the secondary valve 55 in the “closed” state is opened, the downstream branch valve on the secondary pipe 52 side is opened. The work of closing the cock 4B on the side of the 59 and the first gas adsorption vessel 2A is performed.
As a result, gas is supplied to the gas consuming device only from the system via the primary side pipe 51 and the gas meter GM.
After that, by removing the first gas adsorption container 2A and the pressurized supply system 60 from the secondary side pipe 52, the work by this gas supply method is completed.

As described above, in the present embodiment, the worker who replaces the gas meter GM is
(1) The first gas adsorption container 2A is connected to the downstream branch pipe 57 (downstream branch valve 59) provided on the downstream side of the secondary valve 55 (“first gas adsorption container connection step A”).
(2) The gas flowing in the secondary side pipe 52 is stored in the first gas adsorption container 2A via the downstream side branch pipe 57 (“gas storage step B”).
(3) The gas stored in the first gas adsorption container 2A is supplied to the secondary side pipe 52 via the downstream side branch pipe 57 (“gas supply step C”).
(4) The secondary valve 55 is closed (“secondary valve closing step D”), and the primary valve 54 is also closed (“primary valve closing step E”).
(5) The old gas meter GMa arranged between the primary side valve 54 and the secondary side valve 55 is replaced with a new gas meter GMb (“gas meter replacement step G”).
(6) After that, the primary side valve 54 and the secondary side valve 55 are opened (“primary side valve opening step H” and “secondary side valve opening step J”), and gas is supplied from the first gas adsorption container 2A. To stop,
It is configured to take steps such as.

That is, in the present embodiment, in order to replace the gas meter GM, even if the primary side valve 54 and the secondary side valve 55 are closed, the gas is continuously supplied to the secondary side pipe 52 without any change as before. Is possible.

Further, in the present embodiment, the gas that will be consumed by the gas consuming device while the gas meter GM is being replaced is stored in advance in the first gas adsorption container 2A, and the gas meter GM is replaced. While the gas is closed (while the primary valve 54 and the secondary valve 55 are closed), the stored gas is returned to the secondary pipe 52.

That is, in the present embodiment, the "gas that has passed through the gas meter GM" itself is used not only while the primary side valve 54 and the secondary side valve 55 are open, but also while these valves are closed. Since the gas is supplied to the secondary side pipe 52, there is no problem of gas theft.

Further, in the present embodiment, since the gas can be stored in the first gas adsorption container 2A at the work place where the gas meter GM is replaced, the first gas adsorption container 2A can be stored in advance before going to the work place. There is no need to store gas in the container. Moreover, in the present embodiment, since the first gas adsorption container 2A is filled with the adsorption material Am, it is possible to store a relatively large amount of gas without enlarging the size of the container.

In this respect, in the present embodiment, the gas meter GM can be replaced by simply preparing the relatively small "color" first gas adsorption container 2A, so that the labor of the worker is surely reduced. be able to.

In the present embodiment, the "gas storage step B" (the step of storing gas in the first gas adsorption container 2A at the work place) is performed, but such a step may be omitted. In this case, the gas may be stored in the first gas adsorption container 2A in advance before going to the work place.

Further, in the present embodiment, the first gas adsorption container 2A is used as the container for storing the gas, but it is also possible to use a container in which the adsorption material Am is not stored.

Further, in the present embodiment, the replacement work of the gas meter GM has been described as an example, but the present invention is not limited to this.
(1) Two valves (upstream valve and downstream valve, for example, "primary valve 54" and "secondary valve 55") are provided in the middle of the gas pipe, and
(2) A connection portion (“downstream branch pipe 57” and “downstream branch valve 59” of the present embodiment) capable of connecting the first gas adsorption container 2A as in the present embodiment to the gas pipe is provided. What is provided,
It is also possible to apply it to the case of constructing a pipe between the above two valves (for example, repairing a pipe or taking out a branch of a pipe).

Further, in the present embodiment, the secondary valve 55 is closed manually, but it can also be closed automatically.
Such automation, for example, as shown in FIG.
(1) The secondary side valve 55 is changed to a secondary side valve 101 (for example, a solenoid valve or an electric valve) that can be electrically opened and closed.
(2) A fluid sensor 102 (for example, a flow switch) for detecting that gas is flowing toward the secondary side pipe 52 is provided in the downstream side branch pipe 57.
(3) When the fluid sensor 102 detects that gas is flowing in a predetermined direction (direction from the first gas suction container 2A toward the secondary side pipe 52), the secondary side valve 101 is controlled to be closed. A control device 103 (for example, a microcomputer equipped with a central processing unit (CPU)) is provided.
It is possible to realize this. The secondary valve 101, the fluid sensor 102, and the control device 103 are described in the claims as an "on-off valve" configured to be electrically openable and closable, and a "detection means", respectively. "And" control means ".

With this configuration, it is possible to prevent the valve (“secondary side valve”) provided on the downstream side of the gas meter GM from being closed at the wrong timing, so that it is more reliable in the replacement work of the gas meter GM. It is possible to continue to supply gas to the secondary side pipe 52.

Further, in the present embodiment, the secondary valve 101 is opened manually, but it can also be opened automatically.
Such automation is, for example,
(1) A concentration sensor 104 for detecting the concentration of the gas flowing inside the secondary side pipe 52 is provided at a predetermined position.
(2) After closing the secondary valve 101, once it is detected by the concentration sensor 104 that the reduced gas concentration has returned to the normal value, the control to open the secondary valve 101 ((""" Closure of the secondary valve 101 (in "secondary valve closing step D") → decrease in gas concentration (by performing "gas meter replacement step G") → recovery of gas concentration (by performing air purge step I) → (by performing air purge step I) A control device 103 for performing (control such as opening the secondary valve) in the "secondary valve opening step J" is provided.
It is possible to realize this.

With this configuration, an accident caused by erroneous opening timing of the valve (“secondary side valve”) provided on the downstream side of the gas meter GM (for example, the “secondary side valve” is opened before performing air purging). It is possible to prevent accidents and accidents such as forgetting to open the valve after replacing the gas meter).

Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the essays and drawings which form a part of the disclosure of the present invention according to this embodiment. That is, it should be added that all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are of course included in the scope of the present invention.

1 Gas supply system 2A 1st gas suction container 2B 2nd gas suction container 3A, 3B Piping 4A, 4B Cock 51 Primary side piping 52 Secondary side piping 53, 53 Pipe joint 54 Primary side valve 55, 101 Secondary side valve 56 Upstream branch pipe 57 Downstream branch pipe 58 Upstream branch valve 59 Downstream branch valve 60 Pressurization supply system 61 Pressurization pump 62 Pressure gauge 63 Pressure adjustment tank 64 Pressure regulator 71, 72 Pressure resistant hose 102 Fluid sensor 103 Control Device 104 Concentration sensor GM Gas meter GMa Old gas meter GMb New gas meter Am Adsorption material

Claims (8)

It is a gas supply method that supplies a predetermined gas to a pipeline.
A gas storage device connection step of connecting a gas storage device capable of storing gas to a connection portion arranged in the pipeline, and a gas storage device connection step.
A gas supply step of supplying the gas stored in the gas storage device to the pipeline via the connection portion, and a gas supply step.
A valve closing step of closing the on-off valve arranged on the upstream side of the connection portion in the pipeline and closing the second on-off valve arranged on the upstream side of the on-off valve in the pipeline. ,
A partitioning step of dividing a connecting pipeline connecting the on-off valve and the second on-off valve in the pipeline after performing the valve closing step is included.
A gas supply method characterized by that. The gas supply method according to claim 1, wherein the gas storage device includes an adsorption member for adsorbing the gas inside the gas storage device. The first or second aspect of the present invention, wherein the gas storage step of storing the gas flowing in the pipeline through the connection portion in the gas storage device is performed before the gas supply step is performed. Gas supply method. The gas supply method according to any one of claims 1 to 3 , wherein the dividing step includes a step of removing a gas meter arranged in the connecting pipeline. The on-off valve is configured to be electrically openable and closable.
A detection means for detecting whether or not the gas is supplied from the gas storage device to the pipeline, and
A control means for controlling the opening / closing operation of the on-off valve based on the detection result by the detection means is provided.
The closing of the on-off valve in the valve closing step is characterized by being controlled by the control means when it is detected by the detection means that the gas is supplied from the gas storage device to the pipeline. The gas supply method according to any one of claims 1 to 4 . A gas supply system that supplies a predetermined gas to a pipeline.
An on-off valve arranged in the pipeline so that it can be opened and closed,
A gas storage device capable of storing the gas and a gas storage device are provided.
The gas storage device is
It is detachably provided with respect to the connection portion arranged on the downstream side of the on-off valve in the pipeline.
The stored gas is supplied to the pipeline through the connection site.
A gas supply system characterized by that. The gas supply system according to claim 6 , wherein the gas storage device includes an adsorption member for adsorbing the gas inside the gas storage device. The sixth or seventh aspect of the present invention is characterized in that the gas storage device stores the gas flowing in the pipeline through the connection portion and supplies the stored gas to the pipeline. The described gas supply system.

Images