RU2733793C2 - Method for elimination of gas leaks and device for its implementation - Google Patents

Abstract

FIELD: pipeline transport.

SUBSTANCE: group of inventions can be used to eliminate accidents of gas pipelines without stopping transportation of gas. Method of gas leaks elimination includes three stages of works performance. At the first stage, preparatory works are performed, including preparation of trench, cleaning of surface of defective section from dirt, corrosion. At the second stage, the device for realizing the method is used to perform operations for localising gas leakage, as well as unloading the defect zone. At the third stage, complete elimination of gas leaks is performed with the help of the same device. Proposed device comprises tensioner and cylindrical case. In the upper part of the cylindrical housing there is a stop with a hole, a hollow bolt with a transverse hole is screwed into it. Lower part of the housing is connected to the base repeating the curvature of the outer surface of the repaired gas pipeline. In order to remove combustible gas from the place of repair works there is a connecting coupling and a plug in the form of a pipe, at the end of which there is a thread for connection to the coupling. Welding operations envisage use of refractory compactor.

EFFECT: invention discloses a method of eliminating gas leaks and a device for its implementation.

3 cl, 3 dwg

Description

A method for eliminating gas leaks and a device for its implementation refers to pipeline transport and can be used to eliminate accidents and restore the tightness of gas pipelines during their operation without interrupting gas transportation. A known method of repairing an existing pipeline with local through defects and a device for its implementation (patent for invention RU 2267691 IPC F16L 55/16 Application: 2003134057/06, 26.11.2003 patent publication: 10.01.2006 Bul. No. 1), including cleaning the damaged area , installation on the damaged section of the shut-off element with a seal made in the form of a cylindrical pipe, fixing the shut-off element on the pipeline with a clamping device, welding the shut-off element and sealing the pipeline, the clamping device is assembled together with the shut-off element on the pipeline with a technological gap near the through defect, and then moved the clamping device, together with the locking element to the defect site, fix the locking element on the pipeline, and the pipeline is sealed by pressing the seal against the through defect. The sealing element is welded after its fixation on the pipeline. After welding the closure, the hold-down device is removed.

A three-beam centering wheel and a rod in the locking element are additionally introduced into the device for implementing the method, which contains the locking element and the holding device. The wheel has a threaded hole. The rod has the possibility of reciprocating movement relative to the wheel, while one end of the rod has a faceted turn-key surface, and a sealant (sealant) is placed at the end of the second end. The clamping device is made in the form of a clamp and a traverse, and the ends of the clamp have the ability to move them relative to the traverse and are provided with a screw thread. The clamp is made with the possibility of fixing on the traverse. A socket wrench hole is made in the traverse.

However, this method does not take into account the state of the gas pipeline wall metal around the through hole. In the case of severe corrosion of metal, the walls of the gas pipeline around the through hole may be thin; when sealing this section by mechanically pressing the seal against the through defect using a rod, an increase in the size of the defect in the pipeline wall may occur.

Known device for eliminating leaks (patent for invention RU 2206814 IPC F16L 55/18 filing: 08/22/2001 patent publication: 06/20/2003), which has a tension mechanism for fastening the sealing unit. According to the invention, the sealing unit is made in the form of a cylindrical body equipped with a pressure relief valve, brackets for installing a tensioning mechanism and a trapezoidal elastic sealing element located by means of a spring inside the housing, on the inner surface of which in the lower part at the base there is a diametrical groove for the sealing element and annular conical notch. When using this invention, the growth of the defect size in the vessel wall is prevented by unloading the defect zone from the effect of the pressure of the medium in the vessel. A trapezoidal elastic seal, fixed inside the device body by means of springs and a protrusion formed on one side by a diametrical groove, and on the other - by an annular conical recess made on the inner surface of the body, allows the device to be installed on the surface of the vessel in the defect zone without a gap. In this case, the pressure of the medium in the vessel and inside the device is equalized due to partial discharge through the defective section of the vessel. As a result, the device self-compresses, and the defect zone is unloaded. This technical solution was chosen as a prototype. The disadvantages of this technical solution are: the ability with the help of such a device only to localize the gas leak and temporarily eliminate it, however, it is impossible to completely eliminate the gas leak, since when removing the tensioning mechanism, the tightness of the connection between the device and the outer surface of the pipeline will be broken, in addition, remove the valve to relieve pressure it is impossible to eliminate the pipeline leakage.

The problem to be solved by the claimed technical solution is to expand the arsenal of technical means in this area, and also the goal is to find a way in which it is possible, using the device design, to gradually eliminate gas leakage completely from the through hole of a defective section of a gas pipeline of a relatively small size a through hole, without applying mechanical forces of the device parts to the surface of a defective section of a gas pipeline with a through hole, capable of destroying the wall of this defective section, and also after completely eliminating the gas leak in this section of the gas pipeline, do not leave any valves.

To achieve this goal, a method for eliminating gas leakage and a device for its implementation are proposed. The gas leak elimination method includes three stages of work. At the first stage, preparatory work is carried out, including the preparation of a pit of the required dimensions, cleaning the outer surface of the defective section of the gas pipeline from dirt, corrosion and other defects. At the second stage, work is performed using a device for implementing the method for localizing a gas leak, it is used to unload the defect zone, prevent further destruction of this zone and increase the size of the through hole. At the third stage, complete elimination of gas leaks is performed using a device for implementing a method for localizing gas leaks. The solution to the problem in the implementation of the invention is achieved using the proposed device for eliminating gas leaks, which contains a tension mechanism, which attaches the sealing unit to the outer surface of the gas pipeline. The sealing unit is made in the form of a body having a cylindrical shape, having a thread, in the upper part of which there is a stop with a hole, the hole has a thread into which a hollow bolt with a transverse hole is screwed, which serves to relieve excessive gas pressure, the lower part of the body is connected by means of electric welding with a base that repeats the curvature of the outer surface of the defective section of the gas pipeline with a through hole. The lower end of the body, when connected to the base, has a protrusion, the purpose of which is to prevent axial displacement of the elastic sealing element located between the inner surface of the base and the outer surface of the defective section of the gas pipeline with a through hole, while the inner diameter of the sealing element is greater than the outer diameter of the defective section of the gas pipeline with a through hole , limited by the lower edge of the device body. For the removal of combustible gas, from the place of repair work, a coupling and a candle in the form of a pipe are provided at the end of which there is a thread for connecting to the coupling. When performing welding works, the use of a refractory seal is provided. The technical result, provided by the given set of features of a method for eliminating gas leaks and a device for its implementation, is the expansion of the arsenal of technical means in the field of eliminating gas leaks from external gas pipelines, as well as the phased elimination of gas leakage completely from the through hole of a defective section of a gas pipeline of a relatively small size, with At the same time, the design of the device does not provide for mechanical pressing of the seal directly to the through defect with the help of a rod; therefore, the destruction of the thinned wall of the gas pipeline prone to corrosion cannot occur, and after the complete elimination of the gas leak in this section of the gas pipeline, no stop valves remain.

The method includes performing preparatory work at the first stage, at the second stage, work is carried out to exclude the possibility of growth in the size of the defect and temporarily eliminate gas leakage from the through defect of the gas pipeline. At the third stage, during the repair, the complete elimination of gas leakage from the through hole in the defective section of the gas pipeline, while eliminating the presence of temporarily used fittings or stop valves remaining upon completion of work. The proposed device has a tensioning mechanism that attaches the sealing unit to the outer surface of the gas pipeline. According to the invention, the sealing unit is made in the form of a cylindrical body with a stop and a base, equipped with a hollow bolt with a transverse hole for pressure relief, a coupling, a spark plug, and an elastic sealing element located between the inner surface of the device base and the outer surface of the gas pipeline being repaired.

The design of the exhaust plug allows you to divert the gas emanating from the hot work site to a safe distance.

The essence of the proposed method is illustrated by drawings:

FIG. 1 shows a sketch of the device and the location of its main elements during the second stage of work, in Fig. 2 shows a sketch of the device and the location of its main elements during the third stage of work, in Fig. 3 shows the device at the end of work.

FIG. 1, 2, 3 positions indicate:

1 - Hollow bolt with a transverse hole;

2 - Stop with a hole;

3 -Cross hole of a hollow bolt;

4 - device case;

5 - Base of the device body;

6 - Elastic elastic seal;

7 - Defective section of the gas pipeline with a through hole;

8 - Tensioning mechanism;

9 - Exhaust candle;

10 - Coupling;

11 - Refractory sealing material;

12 - Welding joints;

Implementation of a method for eliminating gas leaks and a device for its implementation:

At the first stage, preparatory work is carried out, consisting in preparing a pit of the required dimensions, cleaning the outer surface of the defective section of the gas pipeline from dirt, corrosion and other defects. At the second stage, work is performed to localize the gas leak in order to relieve the defect zone, prevent further destruction of this zone and increase the through hole. When using the claimed invention at the second stage of work, the prevention of the growth of a defect in the wall of a pipeline or vessel is carried out by unloading the defect zone from the effect of environmental pressure in the gas pipeline. The protrusion at the bottom end of the housing 4 fixes the position of the elastic elastic seal 6, so that the seal is between the base of the casing 5 and the defective section of the gas pipeline with a through hole 7, while the protrusion prevents the axial displacement of this seal, contributes to its more dense placement between the inner surface of the base 5 and the outer surface of the defective section of the gas pipeline with a through hole 7. Tension mechanism 8, seal the connection between the inner surface of the device body base 5 and the outer surface of the gas pipeline being repaired 7. After that, screw a hollow bolt with a transverse hole 1 into the stop hole with a hole 2, while gas escape outside the housing 4 of the device is excluded due to the tightening mechanism 8 of the connection of the inner surface of the base of the housing of the device 5 and the outer surface of the gas pipeline being repaired 7. The gas pressure in the gas pipeline 7 and the housing of the device 4 is equalized in seconds even through a hole in the defective section of the gas pipeline 7. As a result, the defect zone is unloaded, while further destruction of the defect does not occur. After that, they begin to prepare the device for the third stage - the elimination of gas leakage. Check for tightness in the base joint 5 and the outer surface of the gas pipeline 7. In the absence of gas leaks in this connection, unscrew the hollow bolt with a transverse hole 1 and move it up, pushing it out so that the transverse hole of the hollow bolt 3 is above the stop with hole 2 , then screwed onto the thread located on the housing 4, first the coupling 10, then the exhaust plug 9. In this position, the hollow bolt with a transverse hole 1 passes gas coming out of the through hole of the defect through the exhaust plug 9 away from the hot work site. In this case, the gas pressure inside the housing of the device 4 remains minimal. After that, the existing gap between the base of the device 5 and the outer surface of the gas pipeline 7 to be repaired is filled with a refractory sealing material 11, for example, an asbestos-containing heat-resistant cord.

The base of the body of the device 5 is connected to the outer surface of the gas pipeline 7 using electric welding, while the gas pressure inside the body of the device 4 remains minimal and does not interfere with the welding process. Then the connecting sleeve 10 with the exhaust plug 9 from the body of the device 4 is unscrewed and removed. A hollow bolt with a transverse hole 1 is screwed into the stop hole with a hole 2 so that the transverse hole of the bolt 3 goes into the body of the device 4, while the threaded connection of the bolt with the transverse hole 1 and the stop with the hole 2 is tightened with a force that prevents gas leakage. Then the head of the bolt 1 is connected to the stop with the hole 2 also by means of electric welding. If there is no gas leak in the connections of the device and the gas pipeline, the work is completed.

Claims (3)

1. A method for eliminating gas leaks, including three stages of sequential execution of work to eliminate gas leaks, namely, at the first stage, preparatory work is performed, at the second stage, using a device for implementing a method for eliminating gas leaks, work is carried out to exclude the possibility of growth in the size of defects and temporarily eliminate gas leakage from a through defect of the gas pipeline, at the third stage, using the same device, complete elimination of gas leakage from the through hole in the defective section of the gas pipeline is performed, the method of eliminating gas leaks differs in that when performing work with this method it is possible to completely eliminate it step by step using the device design gas leakage from the through hole in the defective section of the gas pipeline, while the design of the device does not provide for mechanical pressing of the seal directly to the through defect using the stem, in this connection, the destruction of the thinned wall of the gas pipeline prone to corrosion cannot may occur, and after the complete elimination of the gas leak, no stop valves remain in this section of the gas pipeline. 2. A device for implementing a method for eliminating gas leaks, consisting of a tensioning mechanism and a sealing unit, characterized in that the sealing unit includes a body having a cylindrical shape, a base of the device body, a stop with a hole, a hollow bolt with a transverse hole, a coupling, an exhaust plug and a resilient elastic seal located between the inner surface of the device base and the outer surface of the gas pipeline being repaired. 3. The device according to claim 2, characterized in that the design of the exhaust plug allows the gas emanating from the place of hot work to be diverted to a safe distance.

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