RU2285191C1 - Flexible shell and method of its setting into pipeline - Google Patents

Abstract

FIELD: pipeline transport.

SUBSTANCE: flexible shell comprises bushing that are built in the wall of the cylindrical section of the shell and receives the corner connecting pipe of the flexible hose. The other end of the flexible hose with the corner connecting pipe is mounted in the opening in the wall of the pipelined and is secure to its outer side by means of a nut. The face section and cylindrical section of the shell are covered with a noncombustible flexible composition.

EFFECT: expanded functional capabilities.

5 cl, 5 dwg

Description

The invention relates to structures of elastic shells intended for blocking pipelines for subsequent repair in order to prevent leaks, spills and can be used in the oil and gas and oil refining industries, as well as in main and technological pipelines, water pipelines and sewer networks.

Known rubber-damping device for blocking pipelines (see patent RU No. 2179682, C2 MKI F 16 L, 55/128, publ. 02.20.2002 Bull. No. 5), including a sealing cylindrical chamber with rubber walls, one of the end walls which is equipped with a pipe fitting located along the axis of the chamber, made of cord reinforced with threads, rubberized material and covering the power frame enclosing the cylindrical sealing chamber.

A disadvantage of the known device is the complexity of the design of the device, the presence of a pipe fitting located in one of the end walls, which does not provide sufficient performance, ease of use and safety of service.

The closest in the set of essential features and the achieved technical result (prototype) are a damping rubber-cord device for blocking pipelines and a method for its manufacture (see patent RU No. 2037727 C1, MKI F 16 L, 55/12, publ. 06/19/1995, Bull No. 5), containing an outer cylindrical shell made of rubber-reinforced material reinforced with threads, as well as two end walls reinforced with threads, connected to the shell with the formation of an inner chamber, while the end wall is equipped with a pipe fitting, per walking in the chamber into an annular disk connected to the inner end wall of the chamber through a rubber layer, and the method consists in separately assembling the cylindrical and end parts with installing a thin-walled disposable cooking chamber on the end part with the valve, then connecting the cylindrical and end parts by centrifugal forces.

A disadvantage of the known prototype is the design complexity of attaching the pipe fitting to the end wall, mounting the pipe fitting in the end wall creates inconvenience and danger of injury when installing and removing the shell from the open end of the pipeline after repair, because in case of excess of pressure during the repair process and after its completion, the shell can be squeezed out of the pipeline and injured to the worker, when sucking up oil and gas residues in the pipeline, vacuum can be created and the worker can be drawn into the pipeline, as well as the possibility of ignition of the rubberized material of the shell during welding and firing .

The technical result of the claimed invention is the elimination of these shortcomings, improving the safety when installing an elastic shell in a pipeline, subsequent repair and removal of the shell, eliminating fire hazard.

To achieve the specified technical result, an elastic shell containing a cylindrical, two end parts and a fitting for pumping with compressed air is characterized in that a sleeve is inserted into the wall of the cylindrical part of the elastic shell, into which a fitting is provided, equipped with rubber sealing rings and a split retaining ring, which fixes the fitting in the sleeve, on the fitting perpendicular to its axis, the end of the flexible sleeve is fixed, the other end of which is fixed to the corner fitting having an external thread for replication by a nut on the pipeline through an opening in the wall of the pipeline, while the stiffness of the flexible sleeve is chosen such that its working section is not compressed by the pressure created by compressed air in the elastic shell. The end part and up to 1/3 of the cylindrical part of the elastic shell are coated with a non-combustible elastic composition. The fitting mounted on the elastic sheath is buried in the coating rubber of the wall of the cylindrical part of the elastic sheath in such a way that it does not protrude above the cylindrical part of the elastic sheath, and in the place of fastening of the flexible sleeve to the fitting, the wall rubber of the elastic sheath is sampled.

The method of installing the elastic shell in the pipeline, which consists in introducing the elastic shell into the pipeline and pumping it through a flexible sleeve fixed in the fittings with compressed air, characterized in that after installing the elastic shell in the pipeline, the angular fitting is inserted into the hole in the pipe wall and fixed with a nut, screwed onto the external thread of the corner fitting from the outside of the pipeline.

When installing an elastic shell in the pipeline, the nozzle mounted on the cylindrical part of the elastic shell is shifted relative to the corner fitting fixed on the pipeline by 10 ° -180 °.

The flexible sleeve is made of rubber or as a thin-walled metal tube.

The length of the flexible sleeve is selected depending on the diameter of the pipeline and the size of the applied elastic shell.

The fitting is fixed in the wall of the cylindrical part of the elastic shell so that the worker installing the elastic shell in the pipeline does not have access to the elastic shell during inflation, installation and removal of the shell after repair, in order to avoid an accident.

In addition, if you fix the flexible sleeve in the nozzle vertically, then when inflating the elastic shell from the pressure created by compressed air, the flexible sleeve can abut against the pipe wall, break and its working cross section is blocked, when the flexible sleeve is fixed perpendicular to the nozzle axis, it is freely located on the cylindrical parts of the elastic sheath.

Coating with a non-combustible elastic composition, for example, of rubber based on non-combustible chloroprene rubber and antimony oxide of the end and up to 1/3 of the cylindrical part of the elastic shell, will provide fire safety when sparks or fire get on the elastic shell during welding and repair work.

The offset of the nozzle, fixed in the elastic shell, by 10 ° -180 ° relative to the corner fitting, mounted on the pipeline, allows you to qualitatively evenly position the inflated elastic shell throughout the entire internal cavity of the pipeline.

If the fitting displacement is made less than 10 °, then it becomes possible to overlay the fitting on the corner fitting, which increases the clearance when pumping between the elastic shell and the pipe wall and can lead to a violation of the tightness of the overlap of the elastic pipe shell.

If the fitting displacement is made more than 180 °, then it will be necessary to increase significantly the length of the flexible sleeve, which can also violate the tightness of the ceiling and in the subsequent occurrence of dangerous situations.

In order that the fitting does not protrude above the cylindrical part of the elastic shell, a sample is made in the coating rubber of the wall of the cylindrical part of the elastic wall, thereby increasing the tightness of the pipeline overlap.

The invention is illustrated by drawings:

figure 1 is a General view in the initial position of the elastic shell installed in the pipeline;

figure 2 is a cross section aa in figure 1 of an elastic shell in the pipeline;

figure 3 is a transverse section of the fitting in the wall of the cylindrical part of the elastic shell (place B in figure 2);

figure 4 is a General view of the inflated elastic shell in the pipeline;

figure 5 is a cross section along aa in figure 4 inflated elastic shell installed in the pipeline.

The elastic shell 1 (Fig. 1) comprises a sleeve 4 (Fig. 3), rigidly fixed in the wall 2 of the cylindrical part 3, into which a fitting 5 is inserted, provided with rubber sealing rings 6 and a split retaining ring 7, fixing the fitting 5 in the sleeve 4, on the fitting 5 is perpendicular to its axis, the end of the flexible sleeve 8 is fixed, the other end of the flexible sleeve 8 is fixed to the corner fitting 9 (Fig. 5) having an external thread for fastening with a nut 10 on the pipe 11 through the hole in the wall of the pipe 11. End part 12 and up to 1 / 3 cylindrical parts 3 elastic oh shell 1 is covered with a non-combustible elastic composition 13 (figure 4).

In the cover rubber of the wall of the cylindrical part 3 of the elastic shell 1, a selection of 14.

The installation method of the elastic shell in the pipeline is as follows.

The elastic shell 1 is inserted into the pipe 11, and the part of the elastic shell 1, covered with a non-combustible elastic composition 13, must be located from the open end of the pipe 11, through the hole in the wall of the pipe 11 an angled fitting 9 is inserted, which is fixed to the pipe 11 with a nut 10.

After that, the nozzle 5 together with the elastic sheath 1 is displaced in the pipe 11 relative to the angular nozzle 9 by 10 ° -180 ° (figure 2) for the uniform location of the flexible sleeve 8 on the cylindrical part 3 of the elastic sheath 1.

Then the angled fitting 9 is connected to the pumping system and the compressed air is supplied until it is completely sealed and blocked by the elastic shell 1 of the cavity of the pipe 11 without the participation of an employee.

In this case, the stiffness of the flexible sleeve 8 is selected such that its working section for supplying compressed air is not compressed by the pressure created by the compressed air in the elastic shell 1.

After that, repair work is carried out.

Using the proposed invention will eliminate accidents during repairs, improve safety and fire safety.

Claims (5)

1. An elastic shell for tightly shutting off a pipeline, comprising a cylindrical, two end parts and a fitting for pumping compressed air, characterized in that a sleeve is rigidly fixed to the wall of the cylindrical part of the elastic shell, into which a fitting is provided, equipped with rubber sealing rings and a split retaining ring, fixing the fitting in the sleeve, on the fitting perpendicular to its axis, the end of the flexible sleeve is fixed, the other end of which is fixed to the corner fitting having an external thread for mounting nut on the pipeline through the hole in the wall of the pipeline, while the stiffness of the flexible sleeve is chosen so that its working section is not compressed by the pressure created by compressed air in the elastic shell. 2. The elastic shell according to claim 1, characterized in that the fitting is buried in the wall covering rubber so that it does not protrude above the cylindrical part of the elastic shell, and at the point of attachment of the end of the flexible sleeve to the fitting, the wall covering of the cylindrical elastic part is sampled shell. 3. The elastic shell according to claim 1, characterized in that the end and up to 1/3 of the cylindrical part of the elastic shell are coated with a non-combustible elastic composition. 4. The method of installing an elastic shell in the pipeline, which consists in introducing the elastic shell into the pipeline and pumping it through a flexible sleeve fixed in the fittings with compressed air, characterized in that after installing the elastic shell in the pipeline, an angled fitting with a fixed end of the flexible sleeve is inserted into the hole in the wall of the pipeline and is fixed with a nut screwed onto the external thread of the corner fitting from the outside of the pipeline. 5. The method of installing the elastic shell in the pipeline according to claim 4, characterized in that the fitting mounted on the elastic shell is shifted relative to the angular fitting mounted on the pipeline by 10-180 °.

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