RU2704388C1 - Pipeline repair coupling - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: invention relates to pipeline transport and can be used for repair of steel pipelines transporting liquid or gaseous media under pressure. Invention objective is creation of a coupling for repair of the pipeline, which excludes the specified shortcomings of the analogue and the prototype, which provides for reduction of labor intensity of assembling of couplings during repair of pipelines, as well as increased operational reliability of pipeline with repaired couplings of tube walls damages. Coupling for pipeline repair includes metal or non-metal band embracing the pipeline with embedded elements at the ends, and also by the tension unit. Proposed device comprises screw with right and left-direction thread aligned parallel to pipeline axis, nut with eye lugs arranged on screw, and levers in the form of rods with their ends pivotally connected to nuts and embedded elements on tape ends.

EFFECT: simplification of coupling mounting technology and provision of uniform reduction of pipeline surface by flexible tapes.

1 cl, 3 dwg

Description

The invention relates to pipeline transport and can be used in the repair of steel pipelines transporting liquid or gaseous media under pressure.

Various designs of non-welded steel and polymer bandages or couplings are known from the technical field, which are designed to increase the load-bearing capacity of pipes with non-through wall damage, as well as to eliminate through damage. As a rule, bandages or couplings consist of metal or polymer tapes covering the pipeline at the location of the defect, the ends of which are connected using tensioning devices, which are usually bolts and nuts that tighten when tightened, the embedded elements located on the connected ends of the tapes .

The main disadvantage of such designs is the inability to ensure uniform tension of the tapes, due to the need for sequential tightening of the bolts of the tensioning devices.

A device is known for eliminating pipe leaks and for joining their joints [RF Patent No. 2296264, F16L 55/17 (2006.01), publ. 03/27/2007, bull. No. 9], which is a bandage installed on the pipe with damage to the wall, made in the form of a tape with loops at the ends, into which sleeves are installed with holes through which threaded rods with nuts and washers are passed, the tightening of which ensures the tension of the bandage tape. The disadvantages of the analogue are:

1) Significant dimensions of the tension mechanism, making it difficult to apply an anti-corrosion coating.

2) The need for consistent tightening of threaded joints, which does not allow for uniform compression of the pipeline surface with a bandage with damage to the wall.

Closest to the proposed invention (prototype) is a sleeve for repairing a pipeline and a method for its installation [RF Patent No. 2240468, F16L 55/18 (2000.01), publ. 11/20/2004, bull. No. 32], which includes two flexible tapes made of oriented fiberglass, containing looped grips with embedded elements at the ends, tightened together using studs with right and left-hand threads and nuts. Compression of the pipe section with the defect occurs through the adhesive layer and the elastic gasket, while sequentially tightening the studs with a given torque.

The disadvantages of the prototype are:

1) The high complexity of tightening the threaded connection, due to the need to sequentially rotate each stud by a small angle (not more than 1/4 of a turn), due to the fact that the loose studs located next to the screw that is being screwed in prevent the onward movement of the embedded elements of the joined tapes.

2) The inability to ensure uniform compression of the surface of the pipeline with flexible tapes with damage due to the need to perform sequential tightening of each stud.

3) The complexity and metal consumption of the design of the tightening unit, due to the need to place nuts with right or left thread in the embedded elements, designed to screw the studs tightening the ends of the tape.

The aim of the invention is the creation of couplings for repair of the pipeline, eliminating the indicated disadvantages of the analogue and prototype, which reduces the complexity of mounting couplings during pipeline repairs, as well as increasing the operational reliability of the pipeline with repaired couplings damaged pipe walls.

The technical result of the invention is to simplify the mounting technology of the coupling and to ensure uniform compression of the surface of the pipeline with flexible tapes.

The goal and the technical result in a pipe repair sleeve, including a metal or non-metallic tape covering the pipeline with embedded elements at the ends, as well as a tension unit, are solved by the fact that the device contains a screw with right and left threads oriented parallel to the pipeline axis and placed on the screw nuts with eyes, as well as levers in the form of rods, the ends of which are pivotally connected to nuts and embedded elements at the ends of the tape.

The invention is illustrated in FIG. 1-3. In FIG. 1 shows a general view of a coupling mounted on a pipeline. In FIG. 2 shows a tension assembly before tightening. In FIG. 3 shows the tension unit after tightening.

The coupling for repairing the pipeline comprises a tape 2 covering the pipeline 1 (Fig. 1), equipped at the ends with embedded elements 3 connected to each other by a tension unit 4. The tension unit 4 (Fig. 1) contains a screw 5 oriented parallel to the axis of the pipeline 1 (Fig. 2) ), on which the nuts 6 with eyes 7 are symmetrically placed for swiveling with the ends of the rods 8 made in the form of rods, the second ends of which are pivotally connected to the embedded elements 3 at the ends of the tapes 2. Screw 5 (Fig. 2) on one half of the length contains re a right-handed thread, and a left-handed thread on the second half of the length, is additionally equipped with an element 9 for connecting transmission means (not shown in FIG.) to a screw 5 of a torque 10. When the screw 5 is rotated in a direction 11, the nuts 6 are pivotally connected to them the ends of the levers 8 move along the axis of the screw 5 in opposite directions 12, while the levers 8, deviating from the initial vertical position in the direction 13, inform the embedded elements 3 uniform tensile force 14. To ensure a given force I crimping surface of the pipeline 1 (Fig. 1) tape 2 is used to prevent arbitrary unwinding (for example, under the influence of vibration) of the screw 5 (Fig. 3) of the threaded rings 15.

After installing the coupling, the tension unit 4 (Fig. 1) is covered with a protective anticorrosive composition (not shown in Fig.).

Example

It is necessary to repair the pipeline with a diameter of 820 mm, containing on the surface a corrosion defect with a depth of 20% of the wall thickness, a length of 50 mm, a width of 20 mm.

They clean the surface of pipeline 1 (Fig. 1) from an anticorrosion coating (not shown in FIG.), Degrease the surface of pipeline 1 with a solvent, apply an adhesive layer (not shown in FIG.), Fill the defect cavity (not shown in FIG.) With a mixture of adhesive composition and filler in the form of fibers or granules (not shown in Fig.). I install tape 2 on the pipeline 1, 200 mm wide, 15 mm thick, made of composite material. To the embedded elements 3, located at the end of the tape 2, attach the tension unit 4, after which, by rotating the screw 5 (Fig. 2) with a torque wrench (Fig. 2), perform the tension of the tape 2. In the process of tensioning, nuts 6 with the eyes 7 move along the thread of the screw 5 in opposite directions to the ends of the screw 5, while the levers 8 deviate from the vertical position, transmit uniform tensile forces to the embedded elements 3. Fix the screw 5 (Fig. 3) from unscrewing by tightening the screws installed on the screw 5 when assembling the natya assembly 4 (Fig. 1) threaded rings 15 (Fig. 3). Each threaded ring 15 is tightened in the direction of the nearest nut 6.

Apply bitumen mastic to the elements of the tension unit 4 (Fig. 4), as well as to the surface of the pipeline 1 (Fig. 1) under the tension unit 4. A polymer protective film is applied over the sleeve (not shown in FIG.).

The technical result of the invention is:

1) Reducing the complexity of mounting the coupling to repair the pipeline, achieved through the use of a tension unit containing one screw with right and left threads, providing simultaneous uniform tension of the coupling halves (0.4 people / h) instead of the laborious tightening of the threaded connection by sequential rotation each hairpin at a small angle (no more than 1/4 turn) (2 pers./h). The decrease in the complexity of installation relative to the prototype will average 1.6 people / h.

2) Reducing the complexity and metal consumption of the tightening unit, achieved by using instead of several tightening studs and lock nuts with one right and left thread, one screw, two nuts and four levers. The decrease in metal consumption will be at least 20%, the number of threaded elements will decrease by at least 2 times.

In general, increasing the operational reliability of the pipeline is achieved by ensuring uniform compression of the pipeline surface with a defective coupling.

Claims (1)

A pipe repair coupling, including a metal or nonmetallic tape covering the pipeline with embedded elements at the ends, as well as a tension unit, characterized in that the device comprises a screw with right and left threads oriented parallel to the pipeline axis, nuts with eyelets placed on the screw, and levers in the form of rods, the ends of which are pivotally connected with nuts and embedded elements at the ends of the tape.

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