RU79636U1 - METAL PIPE FOR COUPLING CONNECTION - Google Patents

Abstract

Usage: installation of pipelines. Effect: increase the reliability of the connection. The essence of the utility model: that on the outer surface of the ends of the pipe overhangs are made of a material whose hardness is higher than the hardness of the coupling metal, and O-rings are installed in the annular grooves. 4 ill.

Description

The invention relates to the field of pipeline transport, namely, to the technology of mounting pipelines from pipes made in a corrosion-resistant design, and can be used in the construction of high-pressure pipelines in the oil and gas industries.

A known method of connecting metal pipes equipped with an inner lining (USSR AS No. 966382, class C. ³ F16L 13/11, claimed August 15, 1980, published October 10, 82, bull. No. 38), where adjacent the ends of the linings are welded together, the space between the ends of the pipes is filled with reinforced hardening material, and the pipes are connected by a sleeve, deformable until its metal flows into annular grooves located at the ends of the pipes to be joined.

It has the following disadvantages. The tightness of the connection is ensured only due to the tightness of the welded joint of the liners, which is difficult to obtain in the field for materials with different linear thermal expansion coefficients (metal and plastic), and the strength of the connection is ensured by the flow of the metal of the coupling into the annular grooves located at the ends of the pipes to be connected, which is difficult to obtain when connecting pipes by reducing the coupling. That is, it is not possible to reliably connect the pipes.

The closest to the proposed technical essence and the achieved results is one-piece pipe connection, where they make annular grooves on the outer surface of the pipe ends and the response ones on the inner surface of the coupling, which are connected to the discharge devices and through which the middle grooves and the adjacent gaps are filled with hard adhesive composition, and the extreme grooves and the adjacent gaps are elastic (A.S. USSR No. 1285252, class CL ³ F16L 13/10 announced December 13, 84, published January 23, 87, bull. No. 3).

It is also laborious to implement, since it is necessary to make annular grooves at the ends of pipes and couplings, which are difficult to combine in the manufacture and, in particular,

during assembly. In addition, it is necessary to make holes opposite the annular grooves of the coupling, cut the threads, install the discharge devices and pump the adhesives through them. It is almost impossible to obtain a uniform distribution of adhesives for bonding the contacting surfaces with each other, that is, this method does not allow reliable connection of pipes.

The objective of the utility model is to increase the reliability of pipe connections.

The task is achieved by the fact that on the outer surface of the pipe ends protrusions of material are welded, the hardness of which is higher than the hardness of the coupling metal, and O-rings are installed in the annular grooves.

Figure 1 shows a General view of the pipe. The metal pipe 1 contains on the outer surface of its ends protrusions 2, fused from a material whose hardness is higher than the hardness of the metal of the coupling and the annular grooves 3, in which the sealing rings 4 are installed.

Figure 2 shows a General view of the pipe, where the metal pipe 1 contains on the inner surface of the anti-corrosion material 5 to protect against internal corrosion.

Figure 3 shows a General view of the pipe, where the metal pipe 1 contains on the outer surface of the anticorrosive material 6 to protect against external corrosion.

Figure 4 shows a General view of the connection of pipes, where metal pipes 1 are interconnected by a sleeve 7 and insulated with material 8.

A metal pipe for a coupling connection is made as follows. On the outer surface of the ends of the metal pipe 1, projections 2 are welded with a welding machine, with a hardness higher than that of the coupling metal 7. Between the ends of the metal pipe 1 and the projections 2, annular grooves 3 are made into which the sealing rings 4 are installed. The surface of the metal pipe 1 is protected from internal and external corrosion by anti-corrosion materials 5 and 6. Then, sealant 5 is applied to the inner surface of the sleeve 3 or to the outer surface of the ends of the pipes 1.

Metal pipes 1 are interconnected by a sleeve 7 by reduction. In the process of reduction, the protrusions 2 cut into the metal of the coupling 7, which ensure the strength of the metal pipes 1, and the sealing rings 4 installed in the annular grooves 3 are deformed between the ends of the metal pipes 1 and. coupling 7, thereby ensuring the tightness of the connection. The sleeve connection of metal pipes is isolated from external corrosion by an anticorrosive material 8.

Thus, the specified design of the metal pipe for the coupling connection increases the reliability of their connection.

Used Books.

1. A.S. USSR No. 966382 M. Cl. ³ F16L 13/11. The method of connecting metal pipes provided with an inner lining. (I.G. Yusupov, V.G. Golyshkin, A.G. Garifullin, V.N. Protasov, I.A. Ignatiev, G.A. Aleksandrov) - No. 2992479 / 29-08. Declared August 15, 1980; Published on October 15, 82; Bull. No. 38.

2. A.S. USSR No. 1285252. 4 F16L 13/11. One-piece connection. (V.I. Agapchev et al.) - No. 3825005 / 23-08. Declared December 13, 1984; Published on January 23, 87, Bull. Number 3.

Claims (1)

A metal pipe for a coupling connection, containing annular grooves at the ends of the outer surface, characterized in that protrusions of a material whose hardness is higher than the clutch metal hardness are welded on the outer surface of the pipe ends, and O-rings are installed in the annular grooves.