SU1613778A1 - Method of undetachable joining of pipes with inner anti-corrosion coating - Google Patents

Abstract

The invention relates to methods for permanently joining pipes mainly in the construction of pipelines with an internal anti-corrosion polymer coating for transporting gaseous and liquid corrosive media under pressure and can be carried out under field conditions in gas and oil refineries, refineries and chemical plants, as well as in other branches of the national economy . The goal — to preserve the internal protective coating and increase the strength of the joint — is achieved by increasing the stiffness of the joint, as well as reducing shear stresses along the mating surfaces. At the end of one of the pipes 1, 2 with an anticorrosive coating 4, they fix the sleeve 3. The end of the pipe 2 flared into the socket 5. Install the sealing element 6 at the bottom of the coupling 3. Apply a binder to the inner and outer surfaces of the socket 5, to the inner surface of the coupling 3 and the outer surface of the pipe end 1. Pipe end pipes 2 are introduced into the annular gap progressively with a screw rotation up to the stop of the end of pipe 1 into the transitional internal section. Further, not removing the force from the crimped sealing element 6, press the edge of the end of the coupling 3 onto the transitional outer part of the socket 5 and roll around the middle part 10 of the coupling 3 with radial force. 2 Il.

Description

The invention relates to methods for permanently joining pipes mainly in the construction of pipelines with an internal anticorrosive polymer coating for transporting gaseous and liquid corrosive media under pressure and can be used in field conditions on gas and oil fields, refineries and chemical plants, as well as in other national industries. .

The purpose of the invention is to preserve the internal protective coating and increase the strength of the joint.

FIG. 1 shows the pipe connection before assembly; in fig. 2 is the same after the end of the assembly.

The method is carried out as follows.

At the end of one of the pipes 1 and 2, the sleeve 3 is secured and the anticorrosive inner coating 4 is applied. The end of the other pipe is flared into the socket 5. Insert the ring sealing element 6 into the bottom part 7 of the coupling 3, then apply the binder to the outer and the inner surface of the socket 5 on the inner surface of the coupling 3 and the outer surface of the end of the pipe 1. Next, the bell end of the pipe 2 is inserted progressively with a screw rotation into the annular gap to the rigid stop of the end of the pipe 1 into the transitional inner section 8 of the socket 5. At the same time have a sealing element05

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Ment 6 between the end of the bell 5 and the bottom part 7 of the clutch 3 and, not removing the force, the edge of the end of the clutch 3 is pressed onto the transitional outer part 9 of the bell 5, and then the middle part 10 of the clutch 3 is rolled by radial force.

Example. Pipes with an internal anti-corrosion coating with a diameter of 114 mm, a thickness of 6 mm and a length of 9 m are prepared for the connection. At the end of the pipe 1 for 6 mm, it is plastically deformed, crimping it onto the external transition part of the socket, and rolling around the middle part of the coupling with a radial force.

Claims (1)

Invention Formula The method of permanent connection of pipes with internal anti-corrosion coating They are connected to the joint at the end of the trusses. i - closed in the installation between the tubing method in any way (for example, weld a transition coupling with a diameter, most of the diameter of the outer diameter of the ends of the pipe ends, filling the meter of which is equal to 138 mm, and the length of the gap between the coupling and the pipes with glue, W mm End of the pipe flared at the end of which sections of the coupling, worn on the ends the socket with the increment of its internal tube, plastically deform, differing tra, mm and 114 mm long., due to the fact that, in order to protect the internal Then, the annular sealing element of the protective cover and increase made, for example, from polyurethane, the strength of the joint, the coupling is fixed on inserted into the blind bottom of the coupling end of one pipe, the end of the second pipe and far on the pre-cleaned spalls in the socket, in the bottom part the outer surfaces of the end sections of the coupling set the sealing eletrub and the inner surface of the coupling and the 20 cm, put a binder on the outside the glue is applied to the socket by means of limestone, the new and inner surfaces of the socket, pdLLjjyud the inner surface of the coupling and the outer surface of the end of the first pipe and pipe and coupling, progressively ““ id, ”. inserts the socket forward with a screw rotation (at least two turns) around“ rotation into the annular gap up to the stop of the axis of the bell, and the end of the pipe to the rigid first pipe the axis of the flare and linsts is the section of the socket with the compression of the sealing element between the end of the socket and the bottom part of the coupling and, do not remove tact with an annular seal. ”, m ... s ™ s”, and., EFFORT, the edge of the end of the coupling is compressed and compressed in a closed volume. Not a transitional external VCH is taken off the axial force from the bell-shaped end, and then rolls along the radial bar of the pipe, the edge of the end of the coupling, equal to the middle part of the coupling. for example, “Sprut-5. Then, in the annular gap formed by the pipe and the coupling, progressively introduced with rotation (at least two turns) around the axis, the bell-shaped end of the pipe to the rigid stop of the coupling end of the pipe into the transitional inner section of the socket. In this case, the end of the bell socket is in contact with the annular sealing element 6 mm, plastically deformed, crimping it onto the external transition part of the socket, and rolling around the middle part of the coupling with a radial force. Invention Formula