UA62661A - Method for repairing an operating pipeline with local through defects and appliance for its implementation - Google Patents

Abstract

A method for repairing an operating pipeline with local through defects includes cleaning of the damaged part, with installation of the damaged part of a shutoff element, this is made as a cylindrical branch pipe with sealing; fixation of the shutoffelement on the pipeline by pressing appliance, with welding round the shutoff element and tightening the pipeline. The pressing appliance is mounted together with the shutoff element on the pipeline near the through hole, with a technological gap. Then the appliance is displaced together with the shutoff element to the place of the defect, with fixation of the shutoff element at the pipeline. At that, tightening of the pipeline is performed by pressing the sealing to the through defect. An appliance for repair of an operating pipeline with local through defects has shutoff element and a pressing device. The shutoff element is additionally equipped with a three-ray wheel, this performs centering, it has an opening with threading, and a rod, able to perform reciprocal motion with respect to he wheel. At that, one end of the rod has facetted surface for a wrench, and at the edge of the other end hermetic is placed. The pressing device is arranged as a yoke and a traverse, a that the ends of the yoke have screw threading and go out of the traverse with possibility of displacement of those with respect to the traverse, and fixation of the yoke at the traverse, and in the traverse opening for a wrench is provided.

Description

Description of the invention

The invention relates to pipeline transport and can be used to restore the mechanical strength and sealing of pipelines in the gas, oil and other industries without stopping their operation.

There is a well-known method of repairing leaks in pipelines, which consists in localizing the leak in the pipeline, bringing a temporary seal to the leak, reducing the pressure in the pipeline, and grouting the temporary seal with hydraulic concrete after preparatory work. 70 The device for implementing this method involves two walls of sheet piles and temporary sealing (see German patent Mo 274865 MKP E161Y 55/16 of 1990)

The disadvantages of this technical solution are: the low tightness of the repaired section of the pipeline, because it depends entirely on how well or poorly the temporary sealing is performed, which is determined, in particular, by the ratio of the pressure values in the pipeline and the back pressure of the liquid column, which are not quantitatively regulated by the 72 operations of the method , the repair efficiency is low, which is economically justified only by the operation of the pipeline in the process of repair work, their cost is high. There is also a known method of repairing an operating pipeline with local through defects, which includes installing a sealing element on a cleaned section of the pipeline above a local through defect, welding to the sealing element . made in the form of a nozzle with a seal (faucet), and on the inner side 20 of the coaxial nozzle, an annular sealant is placed, while the technological elements are tightened together with a clamping device that fixes the technological elements on the pipeline.

To implement this method, a device is provided, which includes technological elements, on one of which a closing element in the form of a cylindrical nozzle with a seal, a clamping device is installed. A rubber gasket is installed under the nozzle, which serves to seal the inner cavity of the technological element 29, the rings, which are made of two parts, on both sides of the technological elements (see the declaratory "invention patent Mo 53444A. Bull. Mo 1 of 2003)

The most significant drawback of this method and device is the impossibility of ensuring reliable sealing of the pipeline.

The invention is based on the task of developing such a method and device for resealing 30 pipelines using a new sequence of technological operations and the introduction of new elements into the device, which will ensure reliable sealing in the process of eliminating through defects, reduce the volume and duration of repair work under pressure . eh

The solution to this problem lies in the fact that in the known method of repairing a pipeline with local Ha defects, which includes cleaning the damaged area, installing a closing element 32 with a seal in the form of a cylindrical nozzle on the damaged area, fixing the closing element on the pipeline with pressure device, welding of the locking device and sealing of the pipeline, the clamping device is assembled together with the locking element on the pipeline with a technological gap near the through defect, and then the clamping device is moved together with the locking element to /-"Ф the place of the defect, the locking element is fixed on the pipeline, and the sealing of the pipeline is performed with 50 pressing of the sealant to the through defect. The sealing element is welded after it is fixed on the pipeline. After welding the locking element, the clamping device is removed.

From" In the device for implementing the method, which contains a locking element and a pressing device, a three-spoke wheel, which centers, and a rod are additionally introduced into the locking element. The wheel has a threaded hole. The rod has the possibility of reciprocating movement relative to the wheel, while one end 49 of the rod has a key faceted surface, and a seal (sealant) is placed on the end of the second end. The clamping device is made in the form of a collar and a crossbar, and the ends of the collar have the ability to move relative to the crossbar and are equipped with a screw thread that ensures fixation on the crossbar. A keyhole is made in the traverse. b The method and device for repairing an operating pipeline with local through-hole defects is explained by 20 drawings. that Fig. 1 - installation of a closing element on the pipeline; in Fig. 2 - the same top view; on Fig. 3 - section AA of Fig. 2; Fig. 4 is a general view of the repaired section of the pipeline.

On the drawings, positions are indicated: 1 - pipeline; 29 2 - sealant (sealant); in. C - stem; 4 - welded seam connecting the pipe to the pipeline; - three-spoke wheel; 6 - nozzle; 60 7 - weld of the connection of the centering element with the pipe; 8 - collar; 9 - traverse; - puck; 11 - nut; bo 12 - welded seam of the connection of the hemispherical plug with the pipe;

13 - hemispherical plug; 14 - a through defect in the pipeline.

The method is as follows:

The section of the pipeline to be repaired, for example 1020 mm diameter, is cleaned of dirt, earth, insulating material to a metallic shine. Near the through-hole defect (hole in the pipeline), the clamping device is assembled together with the locking element, which has a seal, on the pipeline with a technological gap, and then the clamping device with the locking element is moved to the defective area, and the locking element is fixed on the pipeline. At the same time, the sealing of the pipeline is carried out by moving the seal 7/o (sealant) in the closing element. Then the surface of the pipeline is additionally cleaned and dried at the point of contact between the pipe and the pipeline, and after that, a circular seam is performed by arc welding and the clamping device is dismantled.

The device for carrying out the method consists of a crossbar 9, in which a hole is cut for installing a clamp 8 made of a metal rod. Nuts 11 and washers 10 are intended for clamping the clamp 8 to the pipeline 1. Between /5 the traverse 9 and the pipeline 1 there is a closing element in the form of a pipe b, in which a three-spoke wheel 5, which is centered, is additionally installed. Wheel 5 is welded to pipe b with seam 7. Rod Z is installed in wheel 5. Rod Z and wheel 5 have a screw thread. A seal (sealant) 2 is placed at one end of the rod C. A technological window is cut in the traverse 9, into which a socket wrench (not shown in the drawing) is installed to rotate the rod 3. At the other end of the rod C, a faceted surface is made under

Key.

The device works like this.

Near the defective section of the pipeline 1, a clamp 8 is installed in the traverse 9, which covers the pipeline 1 with a technological gap. A locking element in the form of a pipe 6 is installed between the collar 8 and the pipeline 1. Then the collar 8, the traverse 9 and the pipe 6 are moved to the through defect in such a way that the rod З ов is located above the defect site (the through hole 14 in the pipeline 1). Then, by rotating the nut 11, which slides on the washer 10, the nozzle 6 is fixed relative to the pipeline 1. Then the rod 3 is rotated, while the sealant 2 is pressed against the through hole 14, completely blocking the leak from the pipeline 1. After that, additional cleaning and drying of the pipeline surface is performed 1 at the point of contact between the pipe 6 and the pipeline 1. Then a circular seam 4 is made, connecting the pipeline 1 with the pipe 6. After that, the nut 11 is unscrewed, the clamp 8 and the traverse 9 are removed from the pipeline 1 and the circular seam 4 is welded through the open sectors of the three-spoke wheel 5, centering. In order to ensure long-term and reliable ise) sealing of the pipeline 1, a hemispherical plug 13 is installed on the nozzle 6 and welded with a full He welding ring seam 12. This seam must be subjected to radiographic control for the detection of unacceptable defects according to BSN 012-88. When performing welding work, it is necessary to be guided by the requirements of c.5 VSN 0006-89. co

The specified technical solution provides complete sealing of the operating pipeline with local through-hole defects with a slight decrease in internal pressure and restores its load-bearing capacity.

Claims (4)

The formula of the invention h - c 1. The method of repairing an operating pipeline with local through-and-through defects, which includes cleaning the damaged area, installing a closing element in the form of a cylindrical nozzle with a seal on the damaged area, fixing the closing element on the pipeline with a clamping device, welding the closing element and sealing the pipeline , which differs in that the clamping device is assembled together with the locking element on the pipeline near the through-hole with a technological gap, and then the device is moved together with the locking element to the place of the defect, i.e.) the locking element is fixed on the pipeline, while the pipeline is sealed by pressing the FO sealant to a through defect. 2. The method according to claim 1, which differs in that the sealing element is welded after its fixation (2) on the pipeline. cheek 3. The method according to claim 1, which differs in that the clamping device is removed after welding the closing element with the pipeline. 4. A device for the repair of an operating pipeline with local through defects, which contains a closing element 5v and a pressing device, which is characterized by the fact that the closing element is additionally equipped with a three-spoke centering wheel, in which a hole with a threaded thread is made, and a rod that has P » the possibility of reciprocating movement relative to the wheel, while one end of the rod has a faceted surface under the key, and a sealant is placed on the end of the other end, the clamping device is made in the form of a clamp and a traverse, and the ends of the clamp have a screw thread and are brought out through the traverse with the possibility of their in moving relative to the traverse and fixing the clamp on the traverse, and a keyhole is made in the traverse. b5