RU217617U1 - DEVICE FOR DETERMINING GAS LEAKAGE THROUGH SHUT-OFF AND CONTROL VALVES - Google Patents

Abstract

The utility model relates to the field of the gas industry and can be used in the maintenance of shut-off and control valves, in particular, to control the tightness of the valve in gas transportation systems at main gas pipelines, compressor and gas distribution stations, where gas is discharged through candle pipes into the atmosphere.

The objective of the utility model is to expand the arsenal of technical devices used to detect gas leaks passing through leaky shut-off and control valves.

The technical result consists in the implementation of the specified purpose and the creation of an efficient and easy-to-use device used to detect gas leaks passing through leaky shut-off and control valves.

The problem is solved, and the technical result is achieved by developing and using a device for detecting gas leakage through shut-off and control valves, consisting of a base with a gas meter attached to it, containing an inlet pipe with a seal attached to it, containing a passage channel and an injection chamber, with At the same time, a pressure hose is connected to the pressure chamber for connecting an air compressor.

Description

The utility model relates to the field of the gas industry and can be used in the maintenance of shut-off and control valves, in particular, to control the tightness of the valve in gas transportation systems at main gas pipelines, compressor and gas distribution stations, where gas is discharged through candle pipes into the atmosphere.

At various sections of the gas transportation system, candle pipes are provided, which are used for emergency gas discharge at the linear part of gas pipelines, purging equipment and gas pipelines at compressor stations, as well as for ventilation of gas pipeline casings at underground passages. Periodic monitoring of the tightness of shut-off and control valves is a mandatory requirement to ensure environmental safety when carrying out production control over the protection of atmospheric air [Federal Law "On the Protection of Atmospheric Air" dated 04.05.1999 No. 96-FZ].

It is known the device "Leakage Meter IG-4" of shut-off valves using a candle pipe, based on cutting off a known volume of a candle using an inflatable seal with a pneumatic hand pump, equipped with calibrated nozzles to control the flow of gas flowing from a leaky tap, followed by measuring the parameters by a flow or volumetric method with using a liquid manometer [N.P. Schukin, B.M. Raynov, I.Yu. Bykov "Methods for diagnosing shut-off valves of main gas pipelines for tightness", Journal "Territory oil and gas", 2009, No. 4, p. 14-20].

The disadvantage of this device is the inconvenience of use, due to:

- the need to control the readings of many individual measuring instruments (thermometer, aneroid barometer, liquid manometer);

- the need to comply with the requirements for the quality and quantity of liquid in the pressure gauge (the absence of air bubbles, the accuracy of determining the volume of liquid and its level, refilling when it is displaced);

- the use of manual labor when filling the shelter with air from a pneumatic hand pump, periodic control for the absence of leaks (visual control of the degree of filling), as well as periodic refilling in the presence of leaks.

The objective of the utility model is to expand the arsenal of technical devices used to detect gas leaks passing through leaky shut-off and control valves.

The technical result consists in the implementation of the specified purpose and the creation of an efficient and easy-to-use device used to detect gas leaks passing through leaky shut-off and control valves.

The problem is solved, and the technical result is achieved by developing and using a device for detecting gas leakage through shut-off and control valves, consisting of a base with a gas meter attached to it, containing an inlet pipe with a seal attached to it, containing a passage channel and an injection chamber, with At the same time, a pressure hose is connected to the pressure chamber for connecting an air compressor.

A device for detecting gas leakage through shut-off and control valves is explained using:

fig. 1 - device installed in the pipe.

The designations given in Figs. 1:

1 - base;

2 - cylinder;

3 - rod;

4 - gas meter;

5 - inlet pipe;

6 - passage pipe;

7 - sealer;

8 - injection chamber;

9 - delivery hose;

10 - air compressor;

11 - pipe;

12 - shut-off and control valves.

The device is made mobile and consists of a base (1), which is a hollow metal cylinder (2) with metal rods (3) welded to it. A gas meter (4) is attached to the cylinder (2) of the base (1) by soldering or welding. The inlet pipe (5) of the gas meter (4) is connected to the passage pipe (6) of the sealer (7) by soldering. The dock shelter (7) is made in the form of an elastic inflatable element containing an injection chamber (8) made in the form of a hollow cylinder glued along the inner surface with a passage pipe (6). An injection hose (9) is glued to the upper part of the pressure chamber (8) of the sealer (7) to connect the device to the air compressor (10), while the air compressor (10) can be configured to control and maintain pressure in the pressure chamber (8) sealer (7).

The device works as follows.

The device on the base (1) is installed in the pipe (11), the air compressor (10) pumps air through the injection hose (9) into the injection chamber (8), thereby sealing the connection between the sealer (7) and the pipe (11). The gas passing through the closed non-hermetic gate of shut-off and control valves (12) enters through the pipe (11) to the sealer (7) and sequentially passes through the passage pipe (6), the inlet pipe (5) and enters the gas meter (4), and then released into the atmosphere. Simultaneously with this gas meter (4), the volume of gas leakage is recorded. The air compressor (10) automatically controls the pressure in the discharge chamber (8) and when the pressure drops, air is automatically blown in, maintaining the pressure at the required level. At the end of the measurement, the air is bled from the injection chamber (8), the device is removed from the pipe (11).

An essential distinguishing feature of the device is an increase in ease of use, due to the presence of:

- a single design on the base, allowing the device to be moved by one worker;

- a single means of measuring gas flow and the absence of working fluids in its design, and therefore there is no need to control the values of several measuring instruments, comply with the requirements for the liquid (absence of air bubbles, accuracy of volume and level determination), as well as subsequent calculation of the value of gas flow ;

- an autonomous air compressor with the possibility of automatic pressure control and its maintenance at the required level, and therefore there is no need for manual labor, air pressure control in the sealer and periodic refilling;

- elastic inflatable dock shelter with a "wide" range of expansion coefficient, and therefore there is no need to change the dock shelter with different diameters of candle pipes. For the claimed device, working drawings, strength calculations were made and a prototype was made, which was successfully tested during the maintenance of ball valves at the facilities of Gazpromtransgaz Ukhta LLC.

The claimed device allows for maintenance (diagnosis) of candle shut-off and control valves with control of the tightness of the shutter and is designed to identify defective valves for the purpose of subsequent repair.

Claims (1)

A device for detecting gas leakage through shut-off and control valves, consisting of a base with a gas meter attached to it, containing an inlet pipe with a sealant attached to it, containing a passage channel and an injection chamber, while an injection hose is connected to the injection chamber for connecting an air compressor.

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