RU141412U1 - INTEGRAL ELECTRIC INSULATING COUPLING WITH PROTECTIVE PROTECTION - Google Patents

Abstract

1. One-piece electrically insulating sleeve coupling with tread protection, containing two steel pipes that are separated by a ring of dielectric material located between their ends, the pipes are connected from the inside by a liner, and from the outside by a steel sleeve through a dielectric material, and the inner surface of the connection is protected from corrosion by a dielectric coating material, characterized in that a protector is installed and fixed at the end of one of the nozzles to protect an unprotected section of the pipeline from corrosion and their welded joint. 2. The compound according to claim 1, characterized in that the protector is an aluminum alloy with a zinc content. The compound according to claim 1, characterized in that the tread is steel, in which the value of the standard electronic potential is not higher than that of steel from which the pipes are made.

Description

The utility model relates to the field of pipeline transport, namely to the protection of pipelines from corrosion and can be used to electrically disconnect pipelines into sections protected from corrosion by tread or cathodic protection methods.

A utility model is known. Electrical insulating flange connections (RF patents: No. 2076985 class. F16L 23/02; No. 2162981 class. F16L 25/02; No. 2174637 class. F16L 23/03), which are very difficult to manufacture and have low reliability during operation, since have a large number of parts made of dielectric material. In addition, they cannot be used to protect pipelines through which electrically conductive liquids are transported.

A known utility model taken as a prototype. One-piece electrically insulating sleeve connection (patent of the Russian Federation: No. 2247278 class F16L 25/00) containing two metal nozzles, between the ends of which a ring of dielectric material is installed, the nozzles are connected from the inside by a liner with a dielectric adhesive joint, and from the outside by a metal coupling a permanent lock dielectric glue-mechanical connection.

This connection has the following disadvantage, namely, during current leakage during transportation of electrically conductive fluids, the welded joint and near the suture zone of the pipeline section unprotected by electrochemical protection are corroded.

The objective of the invention is to increase the reliability and durability of the welded joint and near the suture zone of the pipeline section, unprotected from corrosion by electrochemical protection.

This object is achieved in that in a one-piece electrically insulating sleeve coupling with a tread protection containing two steel pipes that are separated by a ring of dielectric material located between their ends, the pipes are connected from the inside by a liner, and from the outside by a steel sleeve through a dielectric material, and the inner surface of the connection is protected against corrosion by a coating of dielectric material, where the new is that at the end of one of the nozzles a protector is installed and fixed for protection from corrosion of an unprotected section of the pipeline and their welded joint. In the compound, an aluminum alloy with a zinc content is used as a tread. In the joint, steel is used as a tread, in which the value of the standard electronic potential is not higher than that of steel from which the pipes are made.

This design of one-piece electrically insulating coupling with tread protection increases the reliability and durability of the welded joint and near the suture zone of the pipeline section, which is not protected from corrosion by electrochemical protection. It is devoid of the disadvantages that are found in other designs of electrical insulating compounds.

In FIG. a general view of the proposed design of a one-piece electrically insulating sleeve coupling with tread protection is presented.

One-piece electrically insulating sleeve coupling with tread protection contains steel pipes 1, steel sleeve 2, liner 3, a ring 4 of dielectric material installed between the ends of the pipes, o-rings 5 of dielectric material, an insulating layer 6 of a dielectric material, an insulating layer 7 of a dielectric material , a coating 8 of dielectric material and a tread 9.

The manufacture of the claimed design of one-piece electrically insulating coupling with tread protection is carried out in the following sequence.

At the ends of the steel pipe 1 on the one hand make sockets, and on the other a chamfer for welding. A ring 4 of dielectric material is mounted on the liner 3. Between the liner 3 and the sockets of the nozzles 1, an insulating layer 6 of thermoplastic dielectric material is applied, which glues them together. Between the liner 3 and the inner surface of the sockets of the nozzles 1, an adhesive joint is formed. O-rings 5 of a dielectric material are installed on the outer surface of the nozzles 1c of the annular grooves; an insulating layer 7 of dielectric material is applied. As the insulating layer 7, fiberglass 3 impregnated with epoxy adhesive is used. Install the sleeve 2 so that it equally grips the nozzles 1. Connect the sleeve 2 to the nozzles 1 by reducing the sleeve 2 using a hydraulic press equipped with a die. In this case, the ends of the coupling 2 are reduced by a large amount, at which a lock connection is formed between the ends of the coupling 2 and the outer surface of the nozzles 1. When reducing between the contacting surfaces of the nozzles 1, the coupling 2 and the liner 3, a mechanical connection is formed, which works due to friction forces, and at the same time pressure is created to glue the same surfaces. O-rings 5 are compressed in the radial direction, thereby ensuring the tightness of the connection until they break. A coating 8 of a dielectric material is applied to the inner surface of a permanent electrically insulating sleeve connection. A protector 9 having the shape of a ring is installed inside one of the ends of the connection with the distance from the end of the nozzles and secured using a hydraulic press equipped with a mandrel. The tread is made of aluminum pipe with zinc content.

One-piece electrically insulating sleeve connection with tread protection is connected to the pipeline using electric arc welding. The connection with the side where the tread is located is connected to a section of the pipeline that is not protected from corrosion.

Claims (3)

1. One-piece electrically insulating sleeve coupling with tread protection, containing two steel pipes that are separated by a ring of dielectric material located between their ends, the pipes are connected from the inside by a liner, and from the outside by a steel sleeve through a dielectric material, and the inner surface of the connection is protected from corrosion by a dielectric coating material, characterized in that a protector is installed and fixed at the end of one of the nozzles to protect an unprotected section of the pipeline from corrosion and their welded joint. 2. The compound according to claim 1, characterized in that the aluminum alloy containing zinc is used as a tread. 3. The compound according to claim 1, characterized in that the tread is steel, in which the value of the standard electronic potential is not higher than that of steel from which the pipes are made.

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