RU2338953C2 - Pipeline shut-off device - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: split clamps, pinned together and locked by nuts, are arranged on the pipeline coupled flanges, the mounting pins being fitted parallel to the pipeline. One of the aforesaid pins accommodates a rotary inserts, a no-go insert representing a dummy plate and a through insert representing a circular plate. The aforesaid inserts are furnished with ears for them to be seated on the pins. The flange hub is made up of two parts tightly coupled by a U-tube composed of flat rings.

EFFECT: compensating properties and preservation of joint parameters in replacing inserts.

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Description

The invention relates to pipeline transport and can be used to shut off the pipeline for technological purposes (installation, repair, testing, etc.).

A device for blocking pipelines is known, see RF Patent No. 55924 for utility model. The device comprises mating pipeline flanges connected by mounting studs by means of threaded connections in the opposite direction, and rotary inserts installed between the flanges on one of the studs to shut off and pass the flow of the transported medium.

The device is not suitable for operation on a straight section of the pipeline, since the high longitudinal rigidity of the latter makes it difficult to breed the mating flanges to change the rotary liners.

As a prototype of the invention, a sequential installation of the described overlapping device and a shear compensator is adopted, which reduces the longitudinal rigidity of the pipeline, eliminates dangerous technological and operational deformations.

Known shear compensators, see the attached product catalog “New. Arm Invest. Compensator manufacturing ”, p.6.”, Containing pipeline flanges, hermetically connected by corrugated bellows and connected by mounting studs with nuts. Compensators are used in conjunction with devices for blocking pipelines and are installed in series with them.

The serial installation of two nodes contains three flange connections, which complicates the design of the pipeline, increases its cost, the complexity of installation and maintenance. In addition, the lateral stiffness of the shear expansion joints is not sufficient to hold the overlap device on the pipe axis and leads to a misalignment of the flanges when they are diluted to change the liners.

The problem solved by the invention is to give the device overlapping compensating properties and preserve the centering parameters of the flange connection when changing liners.

The technical result from the use of the invention is to simplify the design, reducing the complexity of installation and maintenance of the pipeline.

This result is achieved by the fact that in the device for technological overlapping of pipelines containing mating flanges, a bellows, mounting studs connecting the flanges by means of threaded connections, and rotary inserts in the form of a blind and ring disks installed between the flanges on one of the mounting studs, the hub of at least one of flanges is made of two parts, hermetically connected by a bellows consisting of flat rings, in which the outer and inner edges are equipped with oppositely directed protrusions along q welding.

The drawing shows a General view of the preferred design of the device.

The device contains mating flanges 1 and 2 of the pipeline. The detachable grippers 3 and 4 are tightened on the flanges with studs 5 and nuts 6. The grippers are interconnected by mounting studs 7, each of which is installed parallel to the pipeline on threaded connections of the opposite direction. Studs 7 are equipped with turnkey end squares. On one of the studs 7, rotary inserts 8 and 9 are installed. The non-passable insert 8 is made in the form of a blank disk, and the passage through insert 9 is in the form of an annular disk. Inserts are equipped with eyelets for landing on hairpins. The hub of the flange 2 is made of two parts 10, 11, hermetically connected by a bellows, consisting of flat rings 12, in which the outer and inner edges are equipped with oppositely directed projections for welding.

The device operates as follows.

On the flanges 1 and 2 of the pipeline, when the coupling bolts are removed or released, parts of detachable grippers 3, 4 are connected, pre-connected by two mounting studs 7. A third stud with put on rotary inserts 8, 9 is installed in the detachable holes of the grippers. The gripper parts are pulled together with studs 5 and nuts 6. To block the pipeline by rotating the mounting studs 7, flanges 1, 2 are opened, deforming the welded bellows from the rings 12, and an impassable rotary liner is introduced into the gap 8. Then flanges 1 and 2 are brought down with mounting studs, returning the welded bellows to the starting position, tighten the flanges and begin work on the blocked section of the pipeline. After completion of the work in the same sequence, replace the liner 8 on the bushing liner 9 for testing the pipeline. The device is dismantled with the possibility of maintaining between the flanges of the pipeline one of the rotary liners.

The industrial applicability of the invention is confirmed by bench tests and the operation of the installation series.

The production of the proposed device is implemented in a metalworking plant.

The present invention allows to reduce the cost of manufacturing and technological overlap of pipelines.

Claims (1)

A device for technological overlapping of pipelines, comprising mating pipeline flanges, a bellows, mounting studs connecting the flanges by means of threaded connections installed between the flanges on one of the mounting studs, rotary inserts in the form of a blind and ring disks, characterized in that the hub of at least one of the flanges is made of two parts, hermetically connected by a bellows, consisting of flat rings, in which the outer and inner edges are equipped with oppositely directed projections for welding.