CN114352940A - Device and method for shutting down gas for gas pipeline - Google Patents

Abstract

The invention relates to the technical field of gas transportation, and discloses a gas stopping operation device and a gas stopping operation method for a gas pipeline, wherein the gas stopping operation device comprises a first vertical pipe, a second vertical pipe, a transverse pipe, a first ball valve, a second ball valve, a third ball valve, a fourth ball valve, a first pressure gauge, a second pressure gauge and a main valve arranged on the gas pipeline; the lower end of the first vertical pipe is communicated with a gas pipeline on one side of the main valve through a first ball valve, and the lower end of the second vertical pipe is communicated with a gas pipeline on the other side of the main valve through a fourth ball valve; one end of the transverse pipe is communicated with the first vertical pipe through a second ball valve, and the other end of the transverse pipe is communicated with the second vertical pipe through a third ball valve; the first pressure gauge is used for measuring the air pressure in the first vertical pipe, and the second pressure gauge is used for measuring the air pressure in the second vertical pipe. The gas stopping operation device and the gas stopping operation method for the gas pipeline avoid the phenomenon of noise and pollution caused by directly discharging gas into the atmosphere.

Description

Device and method for shutting down gas for gas pipeline

technical field

The present invention relates to the technical field of gas transportation, in particular to a gas shutdown operation device and method for a gas pipeline.

Background technique

Gas pipelines often generate huge noise due to the need to discharge the residual gas in the gas pipeline network during emergency repair, maintenance, new pipe connection and other gas shutdown operations. At present, the noise when discharging gas is usually above 45 decibels, causing noise Disturbing residents, user complaints and other phenomena greatly affect the normal life of residents near the operation site; and direct gas emission will pollute the environment, which is also an economic waste.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: when the gas pipeline discharges the residual gas in the gas stop pipe network during the gas stop operation, noise and environmental pollution will be generated, resulting in waste.

In order to solve the above technical problems, one aspect of the present invention provides a gas shutdown operation device for a gas pipeline, including a first riser, a second riser, a horizontal pipe, a first ball valve, a second ball valve, a third ball valve, the fourth ball valve, the first pressure gauge, the second pressure gauge and the main valve for setting on the gas pipeline;

The lower end of the first riser is connected to the gas pipeline on one side of the main valve through the first ball valve, and the lower end of the second riser is connected to the gas pipeline on the other side of the main valve through the fourth ball valve pipeline connection;

One end of the horizontal pipe is communicated with the first riser pipe through the second ball valve, and the other end of the horizontal pipe is communicated with the second riser pipe through the third ball valve;

The first pressure gauge is used to measure the air pressure in the first riser, and the second pressure gauge is used to measure the air pressure in the second riser.

Further, the horizontal pipe is a high-pressure gas metal mesh hose.

Further, the first standpipe and the second standpipe are both seamless steel pipes.

Further, the side of the first riser is provided with a first connecting head, the side of the second riser is provided with a second connecting head, the second ball valve is connected with the first connecting head, and the The third ball valve is connected with the second connecting head.

Further, both the upper end of the first riser and the upper end of the second riser are higher than the ground.

Further, the above-mentioned gas stop operation device also includes a third pressure gauge and a helium gas tank, the helium gas tank and the pressure regulating device are connected by a gas connection hose, and the third pressure gauge shown is provided on the gas connection hose. .

Another aspect of the present invention provides a gas shutdown operation method for a gas pipeline, which is realized by using the gas shutdown operation device described in any of the above, including:

S1. Close the main valve before the planned gas stop time, open the first ball valve and the fourth ball valve, and close the second ball valve and the third ball valve;

S2. When the measurement value of the second pressure gauge drops to the set value, open the second ball valve and the third ball valve, and stabilize the measurement value of the second pressure gauge at the set value by adjusting the second ball valve and the third ball valve;

S3. Close the second ball valve and the third ball valve during the planned gas stop time.

Further, the set value is 0.03MPA.

Compared with the prior art, a gas stop operation device and method for a gas pipeline provided by the above technical solution has the beneficial effect of: The pipe temporarily transports the gas at the normal pressure end of the upstream pipeline section of the main valve to the pipeline section downstream of the main valve that needs to be shut down as a temporary gas supplement at the gas shut down end, and controls the section of the pipeline that needs gas shut down through the corresponding ball valve. The gas pressure inside makes it meet the normal use requirements of users; after closing all ball valves during gas shutdown, the pipeline pressure at the gas stop operation end is much lower than the normal pressure side pipeline pressure, and the pipeline pressure at the gas stop operation end will quickly become 0, which is not It will generate noise and disturb the people, and there is no need to discharge the gas in the gas-stopping pipe network into the atmosphere, which will not pollute the environment and save costs.

Description of drawings

Fig. 1 is the structural schematic diagram of the gas shut-off operation device of the embodiment of the present invention;

Fig. 2 is the working principle diagram of the third pressure gauge and helium gas tank of the embodiment of the present invention;

FIG. 3 is a flow chart of a gas shutdown operation method according to an embodiment of the present invention.

Among them, 1-first riser pipe, 2-second riser pipe, 3-cross pipe, 4-first ball valve, 5-second ball valve, 6-third ball valve, 7-fourth ball valve, 8-first pressure Table, 9-second pressure gauge, 10-main valve, 11-ground, 12-third pressure gauge, 13-helium gas tank, 14-pressure regulating equipment.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "lateral", The orientation or positional relationship indicated by "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description The present invention and simplified description do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated connection. It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

As shown in FIG. 1 , an embodiment of the present invention provides a gas shutdown operation device for a gas pipeline, including a first riser 1 , a second riser 2 , a horizontal pipe 3 , a first ball valve 4 , and a second ball valve 5 , the third ball valve 6, the fourth ball valve 7, the first pressure gauge 8, the second pressure gauge 9 and the main valve 10 for setting on the gas pipeline;

The lower end of the first standpipe 1 is connected to the gas pipeline on one side of the main valve 10 through the first ball valve 4 , and the lower end of the second standpipe 2 is connected to the gas pipeline on the other side of the main valve 10 via the fourth ball valve 7 pipeline connection;

One end of the horizontal pipe 3 is communicated with the first vertical pipe 1 through the second ball valve 5, and the other end of the horizontal pipe 3 is communicated with the second vertical pipe 2 through the third ball valve 6;

The first pressure gauge 8 is used to measure the air pressure in the first riser 1 , and the second pressure gauge 9 is used to measure the air pressure in the second riser 2 .

Based on the above scheme, the first standpipe 1 , the horizontal pipe 3 and the second standpipe 2 are used to temporarily transport the gas at the normal pressure end of the upstream pipeline section of the main valve 10 to the downstream side of the main valve 10 that needs to stop the gas operation before the gas stop. The pipeline section is used as a temporary gas supplement at the gas stop operation end, and the gas pressure in the pipeline section requiring gas stop operation is controlled through the corresponding ball valve, so as to meet the normal use requirements of users; after closing all ball valves during gas stop, The pressure of the pipeline at the gas stop operation end is much lower than that of the normal pressure end, and the pressure of the pipeline at the stop gas operation end will quickly become 0, which will not cause noise and disturb the people. Cost savings.

Specifically, the main valve 10 can be closed in advance about 3 hours before the planned gas stop time, and then the first ball valve 4 and the fourth ball valve 7 are opened, the second ball valve 5 and the third ball valve 6 are closed, and the first pressure gauge 8 The pressure is measured separately with the second pressure gauge 9. The first pressure gauge 8 measures the pressure at the normal pressure end, and the second pressure gauge 9 measures the pressure at the gas stop operation end. The pressure at the gas stop operation end will drop slowly. When the set value is reached, open the second ball valve 5 and the third ball valve 6, and stabilize the measurement value of the second pressure gauge 9 at the set value. Pressure, close the second ball valve 5 and the third ball valve 6 within a few minutes before the planned gas shutdown time period, so that the pipeline pressure at the gas shutdown operation end is gradually reduced to 0MPA, so as to avoid gas discharge to the outside world.

Optionally, the horizontal pipe 3 in this embodiment is a high-pressure gas metal mesh hose. The high-pressure gas metal mesh hose has certain flexibility and can meet the requirements of ventilation, which can reduce the size of the first riser 1 and the second riser. 2, when there is a large error in the distance between the two risers, it can also be assembled on site to adapt to the local site environment.

Optionally, in this embodiment, the first standpipe 1 and the second standpipe 2 are both seamless steel pipes, and the seamless steel pipes are integrally processed and have good air tightness, which can ensure that the gas will not leak during the transmission process. .

In this embodiment, in order to facilitate the connection between the horizontal pipe 3 and the first standpipe 1 and the second standpipe 2 , the side surface of the first standpipe 1 is provided with a first connecting head, and the side surface of the second standpipe 2 is provided with a first connector. Two connecting heads, the second ball valve 5 is connected with the first connecting head, and the third ball valve 6 is connected with the second connecting head.

As shown in FIG. 1 , in order to facilitate installation and operation, the upper end of the first riser 1 and the upper end of the second riser 2 are both higher than the ground 11 . During installation and operation, there can be one person on the ground 11 and the underground well.

As shown in FIG. 2 , the gas shutdown operation device of this embodiment further includes a third pressure gauge 12 and a helium gas tank 13 , and the helium gas tank 13 and the pressure regulating device 14 are connected by a gas connection hose, and the third pressure Table 12 is provided on the gas connection hose. The pressure regulating device 14 is a device that needs to be repaired when the gas is stopped, and the helium gas tank 13 is used to supply helium gas to the user end when detecting whether the pipeline leaks before resupplying gas to the user.

Specifically, as shown in FIG. 2 , when the pressure regulating equipment 14 needs to be shut down for maintenance, after the gas is shut down in the above-mentioned manner, the gas risers of buildings A, B, and C immediately enter the gas shut-off state. The user is using a gas stove to cook soup. The user does not know that the pressure regulating equipment 14 needs to be shut down urgently due to gas leakage. It happens that the flameout protection device of the indoor gas stove fails. After the pressure regulating equipment 14 is repaired, it is When the gas supply is restored, the gas stove that is using gas in Building B will leak gas to the whole room or the whole house. When the explosion limit value is reached, the ignition source will cause an explosion and other unsafe accidents. In order to prevent the above unsafe accidents from happening, before resuming ventilation, fill the entire gas pipeline network with helium gas (helium is an inert gas, it is a non-flammable gas, and it does not support combustion. Compared with some inert gases such as carbon dioxide, it has an advantage in price and stable gas properties). When the pressure of the charged helium gas in the whole gas-stopped gas pipe network rises to the working pressure of 2500Pa, stop charging the helium gas and connect the The upper pressure gauge monitors the pressure. When the monitoring pressure does not change within 3 to 5 minutes (the monitoring pressure is still 2500Pa), it means that the gas pipelines within the scope of the gas pipeline network where the gas is stopped have no potential safety hazard of leaking gas after testing. The helium gas in the pipeline can be discharged and the gas supply can be restored. Otherwise, if the monitoring pressure of the pipeline continues to drop, it indicates that there is leakage in the gas pipeline within the gas pipeline network where the gas is stopped. At this time, it is necessary to find out the gas leakage point, and then fill in helium after disposing of the gas leakage point. Monitor the pipeline pressure and restore the gas supply only when there is no abnormality after the pressure is stabilized.

As shown in FIG. 3 , an embodiment of the present invention also provides a gas shutdown operation method for a gas pipeline, which is realized by the above-mentioned gas shutdown operation device, including:

S1. Close the main valve 10 before the planned gas stop time, open the first ball valve 4 and the fourth ball valve 7, and close the second ball valve 5 and the third ball valve 6;

S2. When the measurement value of the second pressure gauge 9 drops to the set value, open the second ball valve 5 and the third ball valve 6, and adjust the second ball valve 5 and the third ball valve 6 to make the measurement value of the second pressure gauge 9 stable at the set value;

S3. Close the second ball valve 5 and the third ball valve 6 during the planned gas stop time.

Wherein, the set value is 0.03MPA.

Specifically, all relevant gas pipeline valves related to the gas shutdown operation of the pipeline network can be closed about 3 hours before the planned gas shutdown time, the first ball valve 4 and the fourth ball valve 7 can be opened, and the second ball valve 5 and the third ball valve 6 can be closed. , check the pressure readings displayed on the first pressure gauge 8 and the second pressure gauge 9 respectively, the pressure reading of the first pressure gauge 8 at the normal pressure end is: 0.25MPA (the pressure of the medium pressure pipe network operation), the second pressure gauge 9 The pressure reading was 0.25MPA at the beginning, and it continued to drop over time (because the gas pipeline valves in the gas pipeline network were closed, and the users in the gas pipeline network were constantly using gas, resulting in When the pressure reading of the second pressure gauge 9 drops to 0.03MPA, but it has not reached the planned gas stop time period, you need to slowly open the second ball valve 5 and the third ball valve The pressure readings from 6 to the second pressure gauge 9 are stabilized at 0.03MPA, so that the gas at the normal pressure end temporarily passes through the high-pressure gas-passing metal mesh hose to the gas-stopping operation end as a temporary gas supplement for the gas-stopping operation end; monitoring is required at this time. The pressure reading of the second pressure gauge 9, when the pressure is found to be higher or lower than 0.03MPA, adjust the opening and closing degrees of the second ball valve 5 and the third ball valve 6 in time to stabilize the pressure reading of the second pressure gauge 9 at 0.03MPA (Due to the gas supply relationship of the pressure regulating equipment 14, when the inlet pressure of the pressure regulating equipment 14 is lower than 0.03MPA, there is a high probability that the shut-off valve will trip and the normal gas supply cannot be continued), when the planned gas stop time period is reached In the first few minutes, we can slowly close the second ball valve 5 and the third ball valve 6, so that the pressure in the gas stop pipe network gradually drops to 0MPA when it reaches the planned gas stop time period.

To sum up, the embodiments of the present invention provide a gas shutdown operation device and method for a gas pipeline, which have the following beneficial effects:

1. When the gas network is shut down, it is not necessary to discharge the gas in the gas shut down pipe network into the atmosphere, which will not pollute the environment.

2. When the gas network is shut down, it is not necessary to discharge the gas in the gas shut-off pipe network into the atmosphere, and no noise will be generated to disturb the people.

3. When the gas network is shut down, it is not necessary to discharge the gas in the gas shut-off network into the atmosphere. From an economic point of view, the direct gas discharge is equivalent to direct consumption, and the non-direct gas discharge is converted into the user's use, which is equivalent to the company's profit , For example: the gas pipeline network of DN630 needs to stop the gas operation. When the gas pipeline network is about 1000 meters, the volume of the gas pipeline network is about 311.6 cubic meters. The current natural gas price of our company is 4 yuan per cubic meter (civil gas, commercial The intermediate value of gas consumption and industrial gas consumption), it is calculated that the direct consumption of gas in this operation will directly consume 1246.3 yuan, and the conversion of non-discharged gas into the user's profit is 1246.3 yuan, and the non-emission technology is more profitable than the direct emission technology. gas stop operation).

4. When the gas supply needs to be restored after the gas stop construction is completed, use a high-pressure gas-passing metal mesh hose to restore the normal pressure gas supply to the gas stop operation end, which can be greatly reduced compared to directly opening the main valve 10 to restore the normal pressure gas supply. In the process of restoring the gas supply, the dust in the pipeline is caused by the pressure difference, which reduces the risk of tripping of the pressure regulating equipment 14 at the gas stop operation end, and improves the user's gas experience.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made. These improvements and substitutions It should also be regarded as the protection scope of the present invention.

Claims (8)

1. A gas shut-off operation device for a gas pipeline, characterized in that it includes a first riser, a second riser, a horizontal pipe, a first ball valve, a second ball valve, a third ball valve, a fourth ball valve, a first pressure gauge, second pressure gauge and main valve for setting on gas pipeline; The lower end of the first riser is connected to the gas pipeline on one side of the main valve through the first ball valve, and the lower end of the second riser is connected to the gas pipeline on the other side of the main valve through the fourth ball valve pipeline connection; One end of the horizontal pipe is communicated with the first riser pipe through the second ball valve, and the other end of the horizontal pipe is communicated with the second riser pipe through the third ball valve; The first pressure gauge is used to measure the air pressure in the first riser, and the second pressure gauge is used to measure the air pressure in the second riser. 2 . The gas shutdown operation device according to claim 1 , wherein the horizontal pipe is a high-pressure gas metal mesh hose. 3 . 3 . The gas shutdown operation device according to claim 1 , wherein the first riser and the second riser are seamless steel pipes. 4 . 4 . The gas stop operation device according to claim 1 , wherein a first connecting head is provided on the side of the first riser, and a second connecting head is provided on the side of the second riser, so the The second ball valve is connected with the first connection head, and the third ball valve is connected with the second connection head. 5 . The gas shutdown operation device according to claim 1 , wherein the upper end of the first riser and the upper end of the second riser are both higher than the ground. 6 . 6 . The gas-stopping operation device according to claim 1 , further comprising a third pressure gauge and a helium gas tank, the helium gas tank and the pressure regulating device are connected by a gas connection hose, and the third pressure shown in 6 . A meter is arranged on the gas connection hose. 7. A gas shut-off operation method for a gas pipeline, realized by adopting the gas shut-off operation device according to any one of claims 1-6, characterized in that, comprising: S1. Close the main valve before the planned gas stop time, open the first ball valve and the fourth ball valve, and close the second ball valve and the third ball valve; S2. When the measurement value of the second pressure gauge drops to the set value, open the second ball valve and the third ball valve, and stabilize the measurement value of the second pressure gauge at the set value by adjusting the second ball valve and the third ball valve; S3. Close the second ball valve and the third ball valve during the planned gas stop time. 8 . The gas shutdown operation method according to claim 7 , wherein the set value is 0.03 MPA. 9 .

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