RU2704524C1 - Pipeline 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. Purpose of the invention is creation of the pipeline coupling eliminating the specified disadvantages of analogues and the prototype providing reduction of labor intensity of assemblage of couplings at repair of pipelines, and also improvement of operational reliability of the pipeline with damages of walls of pipes. Pipeline coupling includes two half-couplings made in the form of elastic band from composite material. Device is equipped with fixture, in the form of ledges with loop grips and recesses located opposite protrusions of joint tape, embedded elements, rectangular cross-section with rounded edges, which contain support at the ends, spacer elements.

EFFECT: simplified assembly, increased efficiency of non-metal repair couplings.

1 cl, 5 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.

From the technical field, various designs are known for steel welded or non-welded joints used in pipe repair to be installed on pipes with external or internal wall damage. The main disadvantages of welded steel couplings are the high complexity of their installation, due to their high weight, the need to perform welding work, and the inability to provide the specified compression force of the pipe section with damage by the coupling, due to imperfect shapes (ovality), both the outer surface of the pipe and the inner coupling surface. Non-welded steel couplings, due to the use of steel thin-walled tapes in the design, are intended for repair of pipelines with low pressure of the transported medium (up to 0.6 MPa) and, therefore, cannot be used to increase the bearing capacity of pipes with defects in high pressure pipelines (up to 7 5 MPa).

A known method of repairing a pipeline (options) [RF Patent No. 2156397, F16L 55/17, publ. 09/20/2000, bull. No. 26], which consists in installing a pipe section on the pipe with damage to the band formed by winding a tape spiral onto the pipe with stepwise gluing of each coil with each other using a binder.

The disadvantages of this analogue are:

1) The high complexity and duration of the installation process of the bandage, due to the need for sequential bonding and compression of each coil tape applied to the pipe.

2) The impossibility of ensuring the constancy of the material properties of the formed bandage due to the influence of external factors such as temperature, humidity, and the presence of dust particles in the air, the influence of which in some cases cannot be excluded, due to the influence on the curing process of the binder.

A device and method for repairing a pipeline [RF Patent No. 2525103, F16L 55/175, publ. 08/10/2014, bull. No. 22], including a web of flexible composite material, covering during installation a portion of a pipe with a defect, fixed on the surface of the pipeline using an adhesive layer applied to the surface of the fabric in contact with the surface of the pipeline, and also U-shaped tensioners with bolts tightening between the opposite ends of the web bent 90 ° from the surface of the pipeline, additionally equipped with power elements in the form of steel strips.

The disadvantages of this analogue are:

1) The inability to use the device on high pressure pipelines due to insufficient bearing capacity due to the possible destruction (shear) of the web at the junction with tensioning devices.

2) The inability to ensure uniform compression of the pipeline surface with a cloth due to the need for sequential tightening of the bolts connecting the tension elements

Closest to the proposed invention (prototype) is a sleeve for repairing the pipeline and the method of its installation [RF patent No. 2240468, F16L 55/18, 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 considerable laboriousness of tightening the threaded connection, due to the need for successive rotation of each stud by a small angle (no more than 1/4 of a turn), due to the fact that the loose studs located next to the screw being turned 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 a pipeline coupling that eliminates the indicated disadvantages of analogues and prototype, which reduces the complexity of mounting couplings during pipeline repairs, as well as increasing the operational reliability of the pipeline with damage to the pipe walls.

The technical result of the invention is the simplification of installation technology, as well as improving the efficiency of non-metallic repair couplings.

The goal and technical result in a pipeline coupling, including two half-couplings made in the form of an elastic tape made of composite material, is solved by the fact that the device is equipped with a fastener in the form of protrusions with loop grips and depressions located opposite the protrusions of the joined tape, embedded elements, of rectangular cross section with rounded faces containing support ends, spacer elements.

The invention is illustrated in FIG. 1-5. In FIG. 1 shows a general view of a non-metallic sleeve mounted on a pipeline. In FIG. 2 shows the design of the coupling halves. In FIG. 3 shows the placement of embedded elements with supports. In FIG. 4 shows a diagram of the installation of additional spacer elements. In FIG. 5 shows an example of a device for tensioning coupling halves.

The invention is as follows:

On the pipe 1 (Fig. 1) with damage to the wall (not shown in Fig.), An adhesive composition is applied (not shown in Fig.) And the upper coupling half 2 and the lower coupling half 3 are installed, after which they are tensioned by force acting on the embedded elements 4, performed using a removable device (not shown in Fig.), Providing their movement in directions 5, with the subsequent installation of fixing spacer elements 6, preventing the movement of embedded elements 4 in directions opposite to directions 5 after dismantling the removable stroystva (Fig. not shown).

The upper 2 and lower 3 half couplings (Fig. 2) are made in the form of composite material tapes, contain protrusions 7 with looped grips 8 at the ends for installing embedded elements 4 (Fig. 1), as well as troughs corresponding to protrusions 7 (Fig. 2) 9.

Embedded elements 4 (Fig. 3) are made in the form of steel rods of rectangular cross section with rounded edges. To prevent the impact of embedded elements 4 on the protrusions 7 of the upper 2 and lower 3 coupling halves located below them, supports 10 are mounted at the ends of the embedded elements, sliding when tensioning the upper coupling half 2 and the lower coupling half 3 over the surface of the pipeline 1 (Fig. 1).

The spacer elements 6 (Fig. 1) have an adjustable length, are installed after tensioning the upper coupling half 2 and the lower coupling half 3 between the opposite supports 10 (Fig. 3) of the embedded elements 4. The number of expansion elements 6 can be increased, with additional expansion elements 11 ( Fig. 4) will interact with the embedded elements 4 through an additional support bracket 12.

Example.

It is necessary to repair a pipeline with a diameter of 1420 mm, on the surface of which there is a local corrosion defect with a depth of 30% of the wall thickness, a length of 50 mm, a width of 20 mm.

Dismantle the insulation coating (not shown in FIG.), Clean and degrease the surface of the pipeline 1 (FIG. 1). On the surface of the pipeline 1, at the installation site of the coupling halves, an adhesive composition is applied (not shown in Fig.), The cavity of the defect is filled with filler. Install the upper coupling half 2 and the lower coupling half 3, after which they are connected by installing the upper coupling half 2 (Fig. 3) and the lower half coupling 3 of the mortgages into the loop clamps 8 (Fig. 2) on the right and left side of the pipeline 1 (Fig. 1) elements 4. At the ends of the embedded elements 4, support elements 10 are installed. Between the embedded elements 4 (Fig. 1), located on the right side of the pipeline 1, spacers 6 are installed, after which, using the tongs used as a removable device (Fig. 5) perform stretched half coupling by force on the embedded elements 4 located on the left side of the pipeline 1 (Fig. 1). After tensioning the upper coupling half 2 and the lower coupling half 3, between the embedded elements 4 located on the left side of the pipeline 1, spacer elements 6 are installed (Fig. 1). The tick grip 13 is dismantled (Fig. 5) and transferred to the opposite (right) side of the pipeline 1 (Fig. 1), where the upper half coupling 2 and lower half coupling 3 are re-tensioned until the initially installed spacer elements 6 are tightened.

As a removable device, for example, a tong grip 13 (Fig. 5) can be used, the short ends of which abut against the mortgage elements 4 and are pulled up and down, and an actuating sliding device of the jack type (hydraulic or screw, not fig. shown).

The technical result of the invention is:

1) Reducing the complexity of installation of repair non-metallic couplings, achieved through the use of an auxiliary device that provides simultaneous uniform tension of the coupling halves (0.5 people / h) instead of the laborious tightening of the threaded connection by sequentially turning each stud by a small angle (no more than 1/4 turnover) (2 people / h). Reducing the complexity of installation relative to the prototype will average 1.5 people / h.

2) Reducing the complexity and metal consumption of the tightening unit, achieved by the use of spacer elements instead of tightening pins and lock nuts with right and left threads, which reduces the number of tightening unit elements by at least 4 units and also reduces the weight by at least 25% .

In general, increasing the operational reliability of the pipeline is achieved by ensuring uniform compression of the surface of the pipeline with a defect in a non-metallic sleeve.

Claims (1)

A pipeline coupling, including two coupling halves made in the form of an elastic tape made of composite material, characterized in that the device is equipped with a fastener in the form of protrusions with loop grips and troughs located opposite the protrusions of the joined tape, embedded elements, of rectangular cross section with rounded edges containing ends of the support, spacer elements.

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