RU1807285C - Tubular telescopic compensator - crack trap - Google Patents

Abstract

SUMMARY OF THE INVENTION: pipes of a main pipeline are telescopically fastened with a connecting part made in the form of two coaxial pipes. In the gap between the pipes and on both sides with tension, pipes of the main pipeline are placed. The pipes of the connecting part are made of a material having a coefficient of thermal expansion other than that of the material of the main pipe. The tension between the nozzles and pipes is determined depending on the given inequality. 1 s.p. f-ly, 4 ill.

Description

The invention relates to metallurgy and can be used in the manufacture of pipelines.

The aim of the invention is to extend the service life and increase the reliability of the pipeline by creating a pipe connection that compensates for temperature deformations in the pipelines and is able to localize extended fractures.

The design of the proposed pipe telescopic compensator-crack trap is shown in FIGS. 1-4, where the nozzles 1 of the main pipeline are fastened by a connecting part consisting of two coaxial pipes: the outer pipe 2 and the inner pipe 3,

Pipes 2 and 3 of the construction shown in Figs. 1 and 2 are made of a material having a larger CTE than the CTE of the material of the main pipe 1, and are interconnected by a ring 4 (Fig. 1) or studs 5 (Fig. 2) according to mid length.

Pipes 2 and 3 of the structure shown in FIG. 3 are made of a material having a lower KTR than the KTR of the material of the main pipe 1. On the main pipe on both sides of the connecting part, at a distance from it no more than the depth of the pipe 1 into the gap between the pipes 2 and 3, snap rings 6 are made .

The difference between the structure shown in FIG. 4 and the structure shown in FIG. 3, only in that the outer pipe 2 is made of the material of the main pipeline, the structure being assembled at a temperature not lower than the maximum temperature during operation of the joint.

The ends of the pipe 3 structures shown in all figures, and in FIG. 3 and pipes 1 are tapered to reduce turbulence caused by high-speed flow through the expansion joint.

 The proposed construction works as follows.

cWh

FIG. The 1,2-heating of the compensator significantly weakens the tension between the pipes 1 and pipe 2, but additionally presses the inner pipe 3 against the nozzles 1, which helps to seal between 1 and 3 and provides telescopic mutual approach of the nozzles 1 under the influence of an elongated pipeline. The described effect protects the pipeline from loss of stability and minimizes operating stresses,

The cooling of the compensator compresses the pipes 1 with an additional tension inside the connecting part, preventing the output 1 from the gap between the pipes 2 and 3.

FIG. 3 - depending on the temperature deformation, the compensator is sealed by pressing the nozzles 1, respectively, when heated to the outer pipe 2, while cooling to the inner pipe 3.

FIG. 4 - the method of assembly of the structure ensures tightness between the nozzles 1 and pipe 3 at any operating temperature ..

As an example, a telescopic pipe expansion joint-crack trap is possible, in which the main pipeline is made of St20, 17G1 S, X70 (KTP 11-12), and the connecting part: for the compensator shown in FIG. 1, 2 from X18H9T (16-10 j, Fig. 3 - from titanium alloy 4200, OT4, ATZ (8-9-10 6), Fig. 4 - pipe 2 from St20, 17G1S, X70, and pipe 3 from titanium alloy.

Localization of damage in all variants of the proposed telescopic pipe is provided due to the unconnected ends of the main pipeline. In case of failure of one of the nozzles, the crack will either stop or destroy the outer pipe 2 of the compensator, which will also not lead to further propagation of the crack.

The positive effect of the present invention, compared with the prototype, lies in the fact that along with the possibility of free axial displacement of the connecting ends of the pipeline relative to each other, the mounted telescopic pipe provides complete tightness in the connection, which allows to extend the service life and increases the reliability of the pipeline.

The development of the invention is contemplated at the pilot plant of NPO VNITI.

The application of the present invention will eliminate the damage to pipelines caused by axial deformations of various physical nature, as well as to localize catastrophic damage caused by other reasons.

Claims (2)

1. A pipe, telescopic crack-trap compensator, including pipes of the main pipeline telescopically fastened by the connecting part, characterized in that the connecting part is made in the form of two coaxial pipes, in the gap between which is tensioned on both sides the pipes of the main pipeline are placed. Moreover, the pipes of the connecting part are made of a material having a coefficient of thermal expansion (KTR) different from the KTP of the material of the main pipeline. 2. Compensator-trap cracks nb p. 1, characterized in that the tension r P between pipes of the main pipeline and pipes of the connecting part are determined out of inequality 0 P EF a T / / g, where E is the Yunge module; a-KTP; fi is the Poisson's ratio; F is the cross-sectional area of the main pipeline; T is the temperature difference. , / / J A L HHHHHHHHHHHHHHHHHHHHH Editor Fig 4 Compiled by A. Markov Tehred M. Morgenthal / 3 w figure 3 Proofreader L. Fil