RU2388958C1 - Elastic casing and procedure for installing it in pipeline - Google Patents

Abstract

FIELD: machine building. ^ SUBSTANCE: elastic casing consists of cylinder and two end parts. Bushing 4 for pumping the casing with compressed air is installed in the wall of the cylinder part. Branch 5 is arranged in bushing 4; end 6 of the branch projects outward beyond the wall of pipeline 7. Second branch 8 with thread 9 sealed with packing rings 10 is screwed into the branch. The elastic casing is introduced into the pipeline with vertically oriented branch 5 for installation in the pipeline. Further, branch 5 is let through opening in the wall of pipeline 7. Second branch 8 is screwed into the first one and the elastic casing is pumped till complete sealing of a pipeline cavity. ^ EFFECT: increased safety of operation at installation of elastic casing into pipeline and at successive repair; simplification of design of elastic casing fixture.

Description

The invention relates to the construction of elastic shells designed to shut off pipelines during repairs and preventive maintenance in order to prevent emergency situations, and can be used in the oil and gas and oil refining industries, as well as in trunk and process pipelines, water pipelines and sewer networks.

Known rubber-damping device for blocking pipelines (see patent RU No. 2179682 C2, MKI F16L 55/128, published on 02.20.2002 Bull. No. 5), including a sealing cylindrical chamber with rubber walls, one of the end walls of which is equipped with located along the chamber axis a pipe fitting 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 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.

Also known is a damping rubber-cord device for blocking pipelines and a method for its manufacture (see patent RU No. 2037727 C1, MKI F16L 55/12, published on 06/19/1995 Bull. No. 5), containing an outer cylindrical shell made of rubberized with threads rubberized material, as well as two end walls reinforced with filaments, connected to the shell with the formation of the inner chamber, while the end wall is equipped with a pipe fitting that passes in the chamber into an annular disk connected to the inner end wall of the chamber through rubber oyku and method is that perform separate assembly of cylindrical end portions and with the installation of the end portion with a valve with a thin wall disposable brewing chamber, and then connected a cylindrical end portion by the centrifugal force.

A disadvantage of the known device is the difficulty 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, since 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 the worker, while removing residual oil and gas in the pipeline, the resulting vacuum can draw the worker into the pipeline.

The closest in the set of essential features and the technical result achieved - the prototype is an elastic shell and the method of its installation in the pipeline (see patent RU No. 2285191, IPC F16L 55/12, published on 10/10/2006 Bull. No. 28), containing a cylindrical and two end parts, in the wall of the cylindrical part a sleeve is rigidly fixed into which the fitting is inserted, the end of the flexible sleeve is fixed to the fitting perpendicular to its axis, the other end of which is fixed to the corner fitting having an external thread for fastening with a nut on the pipeline.

The method consists in the fact that after the introduction of the elastic shell into the pipeline, the angular fitting is inserted into the hole in the wall of the pipeline and fixed with a nut, after which the fitting mounted on the elastic shell is displaced relative to the angular fitting mounted on the pipeline by 10-180 °.

A disadvantage of the known prototype is the complexity of the design of the mounting of the fitting to the elastic shell and the angular fitting to the pipeline, which leads to inconvenience and high complexity when installing the elastic shell in the pipeline, especially in pipelines of small diameters from 100 to 350 mm.

In addition, the recess for installing the nozzle due to the small wall thickness of the cylindrical part of the elastic shell for installation in pipelines of small diameters is not sufficiently reliable, and the flexible sleeve located between the inflated elastic shell and the pipeline does not allow for the necessary tightness.

The objective of the invention is to simplify the design of the supply of compressed air into the elastic shell, the technical result of which will be to eliminate these drawbacks, increase safety, reduce the time and laboriousness of work when installing and pumping the elastic shell in pipelines of small diameters.

To achieve the technical result, an elastic shell containing a cylindrical and two end parts and on the cylindrical part an opening with a sleeve rigidly fixed in the wall of the cylindrical part for pumping with compressed air differs in that a sleeve is installed in the sleeve, the end of which extends outside the pipe wall into which a second pipe is screwed, sealed with o-rings.

The method of installing an elastic shell in a pipeline is characterized in that the elastic shell is inserted into a pipeline with a vertically mounted pipe, then the pipe is passed through an opening in the pipe wall, the second pipe is screwed into the first and the flexible pipe is pumped with compressed air until the pipe cavity is completely sealed.

The pipe is selected rigid and installed vertically in an elastic shell, but if you use a flexible sleeve as in the prototype and put it vertically, then when pumping up the elastic shell, it can move and overlap its internal section along which compressed air flows. In this case, the elastic shell can immediately be placed in a pipe with a vertically arranged pipe and there is no need to shift the elastic shell to certain angles in the narrow space of pipelines of small diameters, which increases productivity and labor safety.

The invention is illustrated by drawings:

Figure 1 is a General view of the elastic shell in the pipeline before pumping;

Figure 2 - node B;

Figure 3 is a General view of the elastic shell in the pipeline after pumping.

The elastic shell 1 (FIG. 1) contains a cylindrical part 2 and two end parts 3. A sleeve 4 (FIG. 2) is rigidly fixed to the wall hole of the cylindrical part 2, in which a pipe 5 is installed, the end 6 of which extends beyond the wall of the pipeline 7 (FIG. 3), and pipe 8 with thread 9, sealed with o-rings 10.

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

The elastic shell 1 is inserted into the pipe 7 in the vertical position of the pipe 5 (Fig. 1), then the pipe 5 is passed through an opening in the wall of the pipe 7, a pipe 8 is screwed into the pipe 5, it is fixed from the outside of the pipe 7 and the elastic shell 1 is inflated to the full sealing the cavity of the pipeline 7 (figure 3).

Using the proposed invention will simplify the design of the mounting pipe, reduce the complexity of the operation of pumping an elastic shell in the pipeline and increase safety.

Claims (2)

1. An elastic shell containing a cylindrical and two end parts and on the cylindrical part an opening with a sleeve rigidly fixed in the wall of the cylindrical part for pumping with compressed air, characterized in that a sleeve is installed in the sleeve, the end of which extends outside the pipe wall into which screwed the second threaded pipe, sealed with o-rings. 2. The method of installing an elastic shell in the pipeline, which consists in introducing the elastic shell into the pipeline, pumping it with compressed air, characterized in that the elastic shell is introduced into the pipeline with a vertically mounted pipe, the pipe is passed through an opening in the pipe wall, and then the second pipe is screwed into the first and pump with compressed air until the pipe cavity is completely sealed.

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