CN216951816U

CN216951816U - Liquid seal device for gas pipeline

Info

Publication number: CN216951816U
Application number: CN202220321464.2U
Authority: CN
Inventors: 胡建春; 高永和; 傅建楠
Original assignee: North China Municipal Engineering Design and Research Institute Co Ltd
Current assignee: North China Municipal Engineering Design and Research Institute Co Ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2022-07-12
Anticipated expiration: 2032-02-17

Abstract

A liquid seal device for a gas pipeline comprises a cylinder body with a sealed bottom, a liquid seal cover, a gas inlet, a gas outlet, a liquid inlet pipe, a liquid discharge pipe and an overflow pipe, and is characterized in that a partition plate is vertically arranged in the middle of an inner cavity of the cylinder body and divides the inner cavity of the cylinder body into an air inlet cavity (a) communicated with the gas inlet and an air outlet cavity (b) communicated with the gas outlet, a first liquid level sensor is arranged in the air inlet cavity (a), a second liquid level sensor is arranged in the air outlet cavity (b), a first electric opening and closing valve is arranged on the liquid discharge pipe, a second electric opening and closing valve is arranged on the liquid inlet pipe, the first liquid level sensor and the first electric opening and closing valve are respectively and electrically connected with a self-control assembly, and the second liquid level sensor and the second electric opening and closing valve are respectively and electrically connected with the self-control assembly. The liquid level in the cylinder body of the device is automatically controlled through the whole process of the automatic control assembly, so that the coal gas leakage accident caused by improper operation of an operator is avoided, and the device is safe and reliable to use and simple in structure.

Description

Liquid seal device for gas pipeline

Technical Field

The utility model relates to the technical field of gas liquid seal, in particular to a liquid seal device for a gas pipeline.

Background

The coal gas produced by the coal gas generating device usually contains more water vapor, and in the process of conveying through a pipeline, the water vapor is condensed to separate out condensed water along with the reduction of temperature, the condensed water in the pipeline is collected to increase the load of a pipeline bracket and reduce the flow area of the pipeline, so that the coal gas conveying is influenced, the condensed water in the pipeline needs to be discharged in time, and a coal gas pipeline drainer is needed to be used for discharging condensed water at any time and preventing coal gas leakage. The condensed water in the gas pipeline flows into the drainer through the vertical drainage pipeline at the bottom of the pipeline, the gas also enters the drainer at the same time, and the gas is blocked by the water column in the drainer and can not flow forwards because the pressure of the gas is lower than the static pressure of the water in the drainer, so the gas seal is the liquid seal. The gas liquid seal valve used at present mainly has several problems, firstly, a certain amount of accumulated liquid can be generated in the liquid seal valve when in use, at present, operators mainly drain water in the valve out of the valve by hand, the operators are required to accurately judge the drained water amount when in operation, and gas leakage is easily caused by improper operation, thereby causing potential safety hazard; and secondly, the content of the valve is easy to freeze and freeze in winter, so that the liquid seal valve cannot be normally used.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides the liquid seal device for the gas pipeline, the liquid level in the cylinder body of the device is automatically controlled in the whole process through the automatic control assembly, the gas leakage accident caused by improper operation of an operator is avoided, the use is safe and reliable, and the structure is simple.

As the conception, the utility model adopts the following technical scheme: a liquid seal device for a gas pipeline comprises a cylinder body (1) with a closed bottom, a liquid seal cover (2), a gas inlet (11), a gas outlet (12), a liquid inlet pipe (13), a liquid discharge pipe (14) and an overflow pipe (15), wherein the liquid seal cover (2) is arranged above the cylinder body (1), the gas inlet (11), the gas outlet (12), the liquid inlet pipe (13), the liquid discharge pipe (14) and the overflow pipe (15) are respectively arranged on the side wall of the cylinder body (1) and are communicated with the inner cavity of the cylinder body (1), the liquid seal device is characterized in that a partition plate (3) is vertically arranged in the middle of the inner cavity of the cylinder body (1), the partition plate (3) divides the inner cavity of the cylinder body (1) into an air inlet cavity (a) communicated with the gas inlet (11) and an air outlet cavity (b) communicated with the gas outlet (12), a first liquid level sensor (4) is arranged in the air inlet cavity (a), set up second level sensor (5) in giving vent to anger chamber (b), be equipped with first electronic on-off valve (141) on fluid-discharge tube (14), be equipped with the electronic on-off valve of second (131) on feed liquor pipe (13), first level sensor (4) and electronic on-off valve (141) respectively with automatic control subassembly (6) electric connection, automatic control subassembly (6) through receiving opening and close of the first electronic on-off valve of level signal control (141) of first level sensor (4) transmission, second level sensor (5) and electronic on-off valve of second (131) respectively with automatic control subassembly (6) electric connection, opening and close of the electronic on-off valve of level signal control second (131) of second level sensor (5) transmission is passed through in automatic control subassembly (6).

Further, the automatic control assembly (6) is arranged on the side wall of the cylinder (1) and comprises a PLC (programmable logic controller) (61), a touch screen (62), a first opening and closing key (63) and a second opening and closing key (64), the PLC (61) comprises a first control module (611) and a second control module (612), the first liquid level sensor (4), the first electric opening and closing valve (141) and the first opening and closing key (63) are respectively electrically connected with the first control module (611), and the first opening and closing key (63) is used for controlling the first control module (611) to control the first electric opening and closing valve (141); the second liquid level sensor (5), the second electric opening and closing valve (131) and the second opening and closing key (64) are respectively electrically connected with the second control module (612), and the second control module (612) is controlled to control the second electric opening and closing valve (131) through the second opening and closing key (64); the touch screen (62) is electrically connected with the first control module (611) and the second control module (612) respectively, and is used for inputting liquid level control data and transmitting the liquid level control data to the PLC controller (61).

Further, the upper end of the clapboard (3) is hermetically connected with the liquid sealing cover (2), and the vertical distance L between the lower end of the clapboard and the upper end of the liquid discharge pipe (14) meets the following requirements: DxL ≧ π × (D/2)²Wherein D is the inner diameter of the cylinder body (1), and D is the inner diameter of the coal gas inlet (11).

Furthermore, the cross-sectional area of the inner cavity of the cylinder body (1) is more than or equal to 2 times of the inner cross-sectional area of the coal gas inlet (11), and the caliber of the coal gas inlet (11) is matched with the caliber of the coal gas outlet (12).

Furthermore, one end of the overflow pipe (15) is positioned at the bottom of the side wall of the barrel body (1), the other end of the overflow pipe extends upwards along the outer wall of the barrel body (1) to be consistent with the height of a designed liquid level cover in the barrel body (1), and a manual valve (151) is arranged on the overflow pipe (15).

Further, the body bottom that feed liquor pipe (13) is located barrel (1) and is located barrel (1) interior liquid seal height top, is located and is equipped with check valve (132) that outside-in switched on the body outside barrel (1).

Furthermore, a first liquid level socket (16) is arranged on the side wall of the cylinder body (1) of the air inlet cavity (a), and the first liquid level sensor (4) is arranged in the first liquid level socket (16) and extends to the bottom of the inner cavity of the cylinder body (1); be equipped with second liquid level socket (17) on the barrel (1) lateral wall of venthole chamber (b), second liquid level sensor (5) are arranged in second liquid level socket (17) and extend to barrel (1) inner chamber bottom.

Furthermore, the first liquid level sensor (4) and the second liquid level sensor (5) are both floating ball liquid level sensors.

Furthermore, a manhole (21) is arranged on the liquid sealing cover (2) above the air outlet cavity (b), and a diffusing pipe (22) communicated with the air outlet cavity (b) is arranged on a hole cover of the manhole (21).

Furthermore, an electric tracing band (7) is wound on the outer circumference of the barrel (1), and a heat insulation layer (8) surrounding the circumference of the barrel (1) is arranged on the outer portion of the electric tracing band (7).

The technical scheme of the utility model has the following advantages:

A. the utility model is provided with a first liquid level sensor and a second liquid level sensor in a cylinder, and a first electric opening and closing valve and a second electric opening and closing valve are respectively arranged on a liquid discharge pipe and a liquid inlet pipe and are controlled by an automatic control assembly. When the pipeline normally runs, the automatic control assembly is started to control the first electric start-stop valve, and when the first liquid level sensor detects that the condensed water accumulated liquid in the barrel reaches a set liquid level, the automatic control assembly can control the first electric start-stop valve to be opened and discharge the condensed water accumulated liquid in the barrel; when the first liquid level sensor detects that condensed water accumulated liquid in the barrel is discharged to a set low liquid level, the automatic control assembly controls the first electric opening and closing valve to be closed. When the pipeline need cut off, first electronic on-off valve is closed, and the electronic on-off valve of automatic control subassembly control second is opened, and when second level sensor detected that the interior liquid level of barrel reaches design liquid seal surface liquid level height, the automatic control subassembly can control the electronic on-off valve of second and close, and full automation control has avoided because operating personnel misoperation arouses the coal gas leakage accident, safe and reliable.

B. The electric tracing band is wound on the outer circumference of the barrel body, so that water in the barrel body is heated by the electric tracing band when the electric tracing band is used in winter, freezing is avoided when the environmental temperature is below zero, the device is ensured to be in a normal working state under a low-temperature severe condition, anti-freezing solution is not required to be injected, the use cost is reduced, and meanwhile, in order to save energy, the heat-insulating layer surrounding the circumference of the barrel body is arranged on the outer portion of the electric tracing band, so that the electric tracing band is economical and practical.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is an overall view of the structure of the drum according to the present invention, wherein an electric tracing band is wound around the outer circumference of the drum;

fig. 4 is a schematic block diagram of the structure of the automatic control component in the structure of the utility model.

The labels in the figure are as follows:

1-cylinder body, 11-gas inlet, 12-gas outlet, 13-liquid inlet pipe, 131-second electric on-off valve, 132-check valve, 14-liquid discharge pipe, 141-first electric on-off valve, 15-overflow pipe, 151-manual valve, 16-first liquid level socket and 17-second liquid level socket; 2-liquid sealing cover, 21-manhole, 22-diffusing pipe; 3-a separator; 4-a first level sensor; 5-second level sensor, 51-check valve; 6-an automatic control component, 61-a PLC (programmable logic controller), 611-a first control module, 612-a second control module, 62-a touch screen, 63-a first start-stop key and 64-a second start-stop key; 7-electric tracing band; 8-an insulating layer; a-an air inlet cavity; b-an air outlet cavity.

Detailed Description

As shown in fig. 1-3, the utility model provides a liquid seal device for a gas pipeline, which comprises a cylinder body 1 with a closed bottom, a liquid seal cover 2, a gas inlet 11, a gas outlet 12, a liquid inlet pipe 13, a liquid outlet pipe 14, an overflow pipe 15, a partition plate 3, a first liquid level sensor 4, a second liquid level sensor 5 and an integrated automatic control assembly 6. The liquid sealing cover 2 is arranged above the cylinder body 1 and is detachably, fixedly and hermetically connected with the cylinder body 1, and the gas inlet 11, the gas outlet 12, the liquid inlet pipe 13, the liquid discharge pipe 14 and the overflow pipe 15 are respectively arranged on the side wall of the cylinder body 1 and are communicated with the inner cavity of the cylinder body 1. The baffle 3 is vertically arranged in the cylinder 1, the upper cavity in the cylinder 1 is divided into an air inlet cavity a communicated with the coal gas inlet 11 and an air outlet cavity b communicated with the coal gas outlet 12, and the first liquid level sensor 4 is arranged in the air inlet cavity a and is used for monitoring the liquid level in the cylinder 1 at the part below the air inlet cavity a; the second liquid level sensor 5 is arranged in the air outlet cavity b and used for monitoring the liquid level in the barrel 1 below the air outlet cavity b. A first electric opening and closing valve 141 is arranged on the liquid discharge pipe 14, a second electric opening and closing valve 131 is arranged on the liquid inlet pipe 13, the first liquid level sensor 4 and the first electric opening and closing valve 141 are electrically connected with the automatic control assembly 6, and the opening and closing of the first electric opening and closing valve 141 are controlled through a liquid level signal transmitted by the first liquid level sensor 4; the second liquid level sensor 5 and the second electric opening and closing valve 131 are electrically connected with the automatic control assembly 6 respectively, and the opening and closing of the second electric opening and closing valve 131 are controlled through a liquid level signal transmitted by the second liquid level sensor 5.

When the pipeline normally runs, the automatic control assembly is started to control the first electric start-stop valve, and when the first liquid level sensor detects that the condensed water accumulated liquid in the barrel reaches a set liquid level, the automatic control assembly can control the first electric start-stop valve to be opened and discharge the condensed water accumulated liquid in the barrel; when the first liquid level sensor detects that condensed water accumulated liquid in the barrel is discharged to a set low liquid level, the automatic control assembly controls the first electric opening and closing valve to be closed. When the pipeline need cut off, first electronic on-off valve is closed, and the electronic on-off valve of automatic control subassembly control second is opened, and when second level sensor detected that the interior liquid level of barrel reaches design liquid seal surface liquid level height, the automatic control subassembly can control the electronic on-off valve of second and close, and full automation control has avoided because operating personnel misoperation arouses the coal gas leakage accident, safe and reliable.

The discharge pipe 14 is positioned at the bottom of the side wall of the barrel 1.

The vertical setting of baffle 3 is in 1 inner chamber middle part of barrel, and its upper end and liquid seal cover 2 sealing connection, and its lower extreme satisfies apart from the vertical interval L of 14 upper ends of fluid-discharge tube: d × L ≧ π × (D/2)²Wherein D is the inner diameter of the cylinder body 1, and D is the inner diameter of the gas inlet 11.

The cross-sectional area of the inner cavity of the cylinder body 1 is more than or equal to 2 times of the inner cross-sectional area of the gas inlet 11, so that the flow area of the gas in the cylinder body 1 is not less than the inner diameter of the gas inlet 11. The caliber of the coal gas outlet 12 is matched with the caliber of the coal gas inlet 11. When the designed liquid seal height is reached, the distance between the upper end of the liquid level in the cylinder 1 at the lower part of the air inlet cavity a and the bottom end of the clapboard 3 is more than or equal to 500 mm.

One end of the overflow pipe 15 is positioned at the bottom of the side wall of the barrel body 1, the other end of the overflow pipe extends upwards along the outer wall of the barrel body 1 to be consistent with the height of a designed liquid seal surface in the barrel body 1, and a manual valve 151 is arranged on the overflow pipe 15. The manual valve 151 is closed at ordinary times, and when the pipeline needs to be cut off, the manual valve 151 can be opened when liquid is added into the barrel body 1 and reaches the upper edge of the lower end pipe orifice of the overflow pipe.

The body bottom that feed liquor pipe 13 is located barrel 1 locates barrel 1 interior liquid seal height top, is equipped with the check valve 132 that outside-in switches on the body that is located barrel 1 outside, prevents that the liquid in the barrel 1 from flowing back to feed liquor pipe 13, especially when feed liquor pipe 13 and water pipe intercommunication, guarantees water pipe's water safety.

A first liquid level socket 16 is arranged on the side wall of the cylinder body 1 of the air inlet cavity a, and the first liquid level sensor 4 is arranged in the first liquid level socket 16 and extends to the bottom of the inner cavity of the cylinder body 1; be equipped with second liquid level socket 17 on the barrel 1 lateral wall of venthole cavity b, second liquid level sensor 5 is arranged in second liquid level socket 17 and is extended to barrel 1 inner chamber bottom.

The first level sensor 4 and the second level sensor 5 are preferably float level sensors.

And a manhole 21 is arranged on the liquid seal cover 2 above the air outlet cavity b, and a diffusing pipe 22 communicated with the air outlet cavity b is arranged on a hole cover of the manhole 21.

The liquid for liquid seal in the cylinder 1 can be water or antifreeze, but the water is greatly limited by the ambient temperature, the liquid seal can be failed once the water freezes at low temperature, and the cost of using the antifreeze is high. Therefore, as shown in fig. 3, the electric tracing band 7 is wound on the outer circumference of the cylinder 1, and the electric tracing band 7 is used for heating water in the cylinder 1 in winter, so that the device is ensured not to freeze when the ambient temperature is below zero, the device is ensured to be in a normal working state under severe low-temperature conditions, and anti-freezing solution is not required to be injected, thereby reducing the use cost. Meanwhile, in order to save energy, the heat insulation layer 8 surrounding the circumference of the cylinder body 1 is arranged outside the electric tracing band 7, so that the electric tracing band is economical to use. The outer walls of the liquid inlet pipe 13, the liquid outlet pipe 14 and the overflow pipe 15 are also coated with insulating layers.

As shown in fig. 4, the automatic control assembly 6 is disposed on the sidewall of the cylinder (1), and includes a PLC Controller 61, a touch screen 62, a first on-off button 63, and a second on-off button 64, where the PLC Controller 61 is a Programmable Logic Controller (Programmable Logic Controller) for digital electronic device for automation control, and includes a first control module 611 and a second control module 612 therein. The first liquid level sensor 4, the first electric opening and closing valve 141 and the first opening and closing key 63 are respectively electrically connected with the first control module 611, and the first opening and closing key 63 controls the first control module 611 to control the first electric opening and closing valve 141; the second liquid level sensor 5, the second electric opening and closing valve 131 and the second opening and closing button 64 are electrically connected to the second control module 612, and the second control module 612 controls the second electric opening and closing valve 131 through the second opening and closing button 64. The touch screen 62 is an inductive liquid crystal display device that senses an input signal by touching or touching, and is electrically connected to the first control module 611 and the second control module 612, respectively, for inputting liquid level control data and transmitting the data to the PLC controller 61.

The working process of the utility model is as follows: the maximum transmission level of the first level sensor 4, the minimum transmission level and the maximum transmission level of the second level sensor 5 are first set by the touch screen 62. When the pipeline normally runs, the first opening and closing key 63 is turned on, the first control module 611 is started to control the first electric opening and closing valve 141, and when the first liquid level sensor 4 detects that the condensed water accumulated liquid in the barrel body reaches a set highest transmission liquid level, the first control module 611 controls the first electric opening and closing valve 141 to be opened, and the condensed water accumulated liquid in the barrel body 1 is discharged through the liquid discharge pipe 14; when the first liquid level sensor 4 detects that condensed water accumulated liquid in the barrel 1 is discharged and reaches a set lowest transmission liquid level, the first control module 611 controls the first electric opening and closing valve 141 to close, and the operation is repeated. When the pipeline needs to be cut off, the first opening and closing key 63 is closed, the first electric opening and closing valve 141 is automatically closed, the second opening and closing key 64 is opened, the second control module 612 is started to control the second electric opening and closing valve 131, the second electric opening and closing valve 131 is automatically opened, the liquid inlet pipe 13 starts to inject water into the barrel body 1, the manual valve 151 on the overflow pipe 15 is timely opened, when the second liquid level sensor 5 detects that the liquid level in the barrel body 1 reaches the highest transmission liquid level (namely, the liquid level height of the liquid cover is designed), the second control module 612 controls the second electric opening and closing valve 131 to be closed, and at the moment, a small amount of liquid is emitted from the upper end of the overflow pipe 15. When the pipeline needs to be conducted, the second on-off key 64 is closed, the first on-off key 63 is opened, and at this time, the first liquid level sensor 4 detects that the liquid level in the barrel body exceeds the set highest transmission liquid level, and the first control module 611 controls the first electric on-off valve 141 to be opened, so that liquid is discharged through the liquid discharge pipe 14.

Finally, the utility model adopts the mature products and the mature technical means in the prior art.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the utility model.

Claims

1. A liquid seal device for a gas pipeline comprises a cylinder body (1) with a closed bottom, a liquid seal cover (2), a gas inlet (11), a gas outlet (12), a liquid inlet pipe (13), a liquid discharge pipe (14) and an overflow pipe (15), wherein the liquid seal cover (2) is arranged above the cylinder body (1), the gas inlet (11), the gas outlet (12), the liquid inlet pipe (13), the liquid discharge pipe (14) and the overflow pipe (15) are respectively arranged on the side wall of the cylinder body (1) and are communicated with the inner cavity of the cylinder body (1), the liquid seal device is characterized in that a partition plate (3) is vertically arranged in the middle of the inner cavity of the cylinder body (1), the partition plate (3) divides the inner cavity of the cylinder body (1) into an air inlet cavity (a) communicated with the gas inlet (11) and an air outlet cavity (b) communicated with the gas outlet (12), a first liquid level sensor (4) is arranged in the air inlet cavity (a), set up second level sensor (5) in going out gas cavity (b), be equipped with first electronic on-off valve (141) on fluid-discharge tube (14), be equipped with electronic on-off valve (131) of second on feed liquor pipe (13), first level sensor (4) and first electronic on-off valve (141) respectively with automatic control subassembly (6) electric connection, automatic control subassembly (6) are through receiving the opening and closing of the first electronic on-off valve (141) of liquid level signal control of first level sensor (4) transmission, second level sensor (5) and electronic on-off valve (131) of second respectively with automatic control subassembly (6) electric connection, and automatic control subassembly (6) are through receiving the opening and closing of the electronic on-off valve (131) of liquid level signal control second of second level sensor (5) transmission.

2. The liquid seal device for the gas pipeline according to claim 1, wherein the automatic control assembly (6) is arranged on a side wall of the cylinder (1) and comprises a PLC controller (61), a touch screen (62), a first start-stop button (63) and a second start-stop button (64), the PLC controller (61) comprises a first control module (611) and a second control module (612), the first liquid level sensor (4), the first electric start-stop valve (141) and the first start-stop button (63) are respectively electrically connected with the first control module (611), and the first start-stop button (63) controls the first control module (611) to control the first electric start-stop valve (141); the second liquid level sensor (5), the second electric opening and closing valve (131) and the second opening and closing key (64) are respectively electrically connected with the second control module (612), and the second control module (612) is controlled to control the second electric opening and closing valve (131) through the second opening and closing key (64); the touch screen (62) is electrically connected with the first control module (611) and the second control module (612) respectively, and is used for inputting liquid level control data and transmitting the liquid level control data to the PLC controller (61).

3. The liquid seal device for gas pipelines according to claim 1, characterized in that the upper end of the partition plate (3) is connected with the liquid seal cover (2) in a sealing way, and the vertical distance L between the lower end of the partition plate and the upper end of the liquid discharge pipe (14) satisfies the following conditions: d × L ≧ π × (D/2)²Wherein D is the inner diameter of the cylinder body (1), and D is the inner diameter of the coal gas inlet (11).

4. The liquid seal device for the gas pipeline as claimed in claim 1, wherein the cross-sectional area of the inner cavity of the cylinder (1) is more than or equal to 2 times of the cross-sectional area of the inner cavity of the gas inlet (11), and the caliber of the gas inlet (11) is matched with that of the gas outlet (12).

5. The hydraulic seal device for gas pipelines according to claim 1, characterized in that one end of the overflow pipe (15) is located at the bottom of the side wall of the cylinder body (1), the other end extends upwards along the outer wall of the cylinder body (1) to be consistent with the height of the designed liquid level in the cylinder body (1), and a manual valve (151) is arranged on the overflow pipe (15).

6. The liquid seal device for the gas pipeline according to claim 1, wherein the liquid inlet pipe (13) is located at the bottom end of the pipe body in the cylinder body (1) and is arranged above the liquid seal surface in the cylinder body (1), and the check valve (132) which is conducted from outside to inside is arranged on the pipe body outside the cylinder body (1).

7. The liquid seal device for gas pipelines according to claim 6, characterized in that a first liquid level socket (16) is arranged on the side wall of the barrel (1) of the gas inlet cavity (a), and the first liquid level sensor (4) is arranged in the first liquid level socket (16) and extends to the bottom of the inner cavity of the barrel (1); go out to be equipped with second liquid level socket (17) on the barrel (1) lateral wall of air cavity (b), second liquid level sensor (5) are arranged in second liquid level socket (17) and extend to barrel (1) inner chamber bottom.

8. The liquid seal device for gas pipelines according to claim 1, wherein the first liquid level sensor (4) and the second liquid level sensor (5) are both float ball liquid level sensors.

9. The liquid seal device for gas pipelines according to claim 1, characterized in that a manhole (21) is arranged on the liquid seal cover (2) above the gas outlet cavity (b), and a diffusing pipe (22) communicated with the gas outlet cavity (b) is arranged on the hole cover of the manhole (21).

10. The hydraulic seal device for gas pipelines according to claim 1, characterized in that an electric tracing band (7) is wound on the outer circumference of the cylinder (1), and an insulating layer (8) surrounding the circumference of the cylinder (1) is arranged on the outer portion of the electric tracing band (7).