RU166680U1 - PIPELINE WELD PROTECTION DEVICE - Google Patents

Abstract

1. A pipe connection, comprising a sleeve installed coaxially inside the pipes connected by a weld, provided with sealing elements and mounting projections, a sleeve with a cavity formed in the joint area of the pipe, characterized in that it contains three sealing elements at each end portion of the sleeve, with two sealing elements made in the form of collar cuffs located on different sides from the sealing part, the stop for each of the collar cuffs closest to the weld .2. A pipe connection according to claim 1, characterized in that the collar cuffs farthest from the weld that are in contact with the transported medium are made with the possibility of longitudinal reciprocating movement. 3. The pipe connection according to claim 1, characterized in that the sealing element is made of an elastic material. A pipe connection according to claim 1, characterized in that the sealing part is made of a softer material than the collar cuffs. 5. The pipe connection according to claim 3, characterized in that the elastic material is rubber or polyurethane. 6. The pipe connection according to claim 1, characterized in that the cavity is filled with insulating material.

Description

Device for protecting the weld of the pipeline. The utility model relates to pipe fittings, in particular, to pipe joints by welding, and can be used in the assembly of pipelines intended for transporting energy carriers in a liquid, gaseous state, materials in the form of pulp containing abrasives, fly ash, alumina and other highly corrosive media .

It is known to connect pipes with an internal enamel coating containing two pipes to be connected, to the ends of which corrosion-resistant bushings are welded. An enamel layer is applied to the inner surface of the pipes and corrosion-resistant bushings are welded together (USSR author's certificate No. 1648696, class B23K 31/00, 1991). A disadvantage of the known solution is the complexity of the connection, the need for expensive bushings made of scarce materials, the inability to assemble pipes in the field.

When welding pipes with an internal enamel coating, a device is also used that contains two pipes with sockets at the ends, in which inserts are placed to form a cavity between the pipe ends and the outer surface of the inserts, which is filled with corrosion-resistant material (USSR author's certificate No. 1328121, class B23K 31 / 06, 1987). The disadvantage of this solution is the need to make sockets at the ends of the pipes, the difficulty of placing the inserts inside the pipes, as well as the effect of welding on the coating through the gap between the inserts, which does not provide reliable protection for the pipe joint and complicates the design of the connection and the technology of its assembly.

It is known to connect pipes containing two pipes with an internal enamel coating and a sleeve installed coaxially inside them to form cavities in the joint zone of the pipes, provided with radial thrust protrusions and sealing elements at the end sections of the sleeve (patent RU 2080510 C1, F16L 13/02, publ. 05/27/1997, bull. No. 15). To ensure the tightness of the butt joint and to prevent the ingress of aggressive media into it from different sides of the sleeve, mastic is applied around its perimeter. After hardening, the mastic adheres tightly to the outer surface of the sleeve and the inner surface of the pipe, ensuring the tightness of the annular welding joint, which eliminates the ingress of the transported medium into the weld area.

However, the disadvantage of this device is the difficulty in implementing the pipe connection when laying the pipeline in the field, low reliability of the connection. The use of glue, rubber seals, mastics, which are exposed to high temperatures during the formation of a weld, as a protective material also reduces the reliability of the joint when exposed to corrosive media. Since the mastic is applied when laying the pipeline from different sides of the sleeve, in the field when installing the sleeve in the second pipe, the quality of the coating from the mastic does not guarantee the reliability of the sleeve and does not exclude the possibility of leakage, which reduces the reliability of the device.

This compound is the closest in technical essence to the proposed utility model and is taken as a prototype.

The utility model was tasked with increasing reliability and reducing financial and labor costs when connecting pipes.

The technical result is to increase reliability and reduce financial and labor costs during the laying and operation of the pipeline.

The technical result is achieved due to the fact that in the pipe connection containing a sleeve coaxially installed inside the pipes connected by a weld seam and equipped with sealing elements and mounting projections, a sleeve is formed in the joint zone of the pipe tubes, there are three sealing elements at each end section of the sleeve, two sealing elements are made in the form of collar cuffs located on different sides of the sealing part (hereinafter referred to as cuffs), with emphasis for each of the cuffs closest to the weld live mounting sleeve protrusion.

The drawing shows a connection of pipes in section.

The pipe connection contains two connected pipes 1 and 2 with coaxial bushings 4 installed inside them in the weld zone 3. On the bush 4 there are thrust protrusions 5 and 6 protruding above the surface of the bush 4 to fix it in the joint zone of the pipes 1 and 2 to be joined and run the role of the stop for sealing parts 7 and 8 located between the cuffs 9, 10 and 11, 12, respectively. The cavity 13 located in the weld zone is filled with heat-insulating material.

The assembly of the pipe connection is as follows.

Sealing elements in the form of cuffs 9, 10, 11, 12 and sealing parts 7 and 8 are factory installed on the end sections of the sleeve 4. The sealing part 7 is placed between the cuffs 9 and 10, the sealing part 8 is placed between the cuffs 11 and 12. Next, the sleeve 4 with the indicated sealing elements in the field is inserted up to about half into one of the pipes to be welded, for example, pipe 1. Then pipe 2 is joined with pipe 1 and cavity 13 is filled with heat through further technological openings 14 insulating material. Next, the pipes are welded to form a weld 3.

The device operates as follows.

The outer cuffs 9 and 12 under the influence of the pressure of the transported medium move in the longitudinal direction towards the weld 3 and compress the sealing parts 7 and 8, respectively. At the same time, the sealing part 7 under the action of the cuff 9 abuts against the cuff 10 in contact with the focus 5 on. the sleeve 4 and creates a contact area with the inner surface of the pipe 1, ensuring the tightness of the cavity 13 in the region of the weld 3 from the side of the pipe 1. In the same way, the sealing of the cavity 13 in the region of the weld 3 and from the side of the pipe 2 is improved. The sealing part 8 under the action of the cuff 12 rests on the cuff 11 in contact with the stop 6 on the sleeve 4, and creates a contact pad with the inner surface of the pipe 2, ensuring the tightness of the cavity 13 from the side of the pipe 2.

The higher the pressure of the medium transported through the pipeline, the more reliable the tightness of the cavity 13 of the weld zone 3 is ensured both from the side of the pipe 1 and from the side of the pipe 2. In this case, the self-locking phenomenon is observed, since as the pressure of the transported medium in the pipeline increases, the tightness improves cavity 13 in which the weld 3 is located.

To improve the reliability of the proposed device for protecting the weld of the pipeline in the pipe connection:

- the most remote from the weld in contact with the transported medium, perform with the possibility of longitudinal reciprocating motion;

- the sealing element is made of an elastic material;

- the sealing part is made of softer than the cuff material;

- as an elastic material use rubber or polyurethane.

- the cavity is filled with insulating material.

To increase the reliability of the pipeline in the weld at the pipe joint, the sleeve 4 is made of metal or composite material.

The proposed utility model is novel, industrially applicable.

Claims (6)

1. A pipe connection, comprising a sleeve installed coaxially inside the pipes connected by a weld, provided with sealing elements and mounting projections, a sleeve with a cavity formed in the joint area of the pipe, characterized in that it contains three sealing elements at each end portion of the sleeve, with two sealing elements made in the form of collar cuffs located on different sides from the sealing part, the stop for each of the collar cuffs closest to the weld . 2. The pipe connection according to claim 1, characterized in that the collar cuffs that are farthest from the weld seam in contact with the transported medium are made with the possibility of longitudinal reciprocating motion. 3. The pipe connection according to claim 1, characterized in that the sealing element is made of an elastic material. 4. The pipe connection according to claim 1, characterized in that the sealing part is made of a softer material than the collar cuffs. 5. The pipe joint according to claim 3, characterized in that the elastic material is rubber or polyurethane. 6. The pipe connection according to claim 1, characterized in that the cavity is filled with insulating material.

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