Loose force transmission insulation flange and surface crack detection method thereof

Abstract

The invention discloses a loose force transmission insulation flange and a surface crack detection method thereof and belongs to the field of insulation flanges. The loose force transmission insulation flange comprises an SR connector and a pair of flange short pipes. The pair of flange short pipes are connected to the left end and the right end of the SR connector correspondingly. The side end ofthe SR connector is connected with a sealing assembly. The surface of the SR connector and the surface of the flange short pipe are wrapped with self-detection wrapping films. The part between the surface of the SR connector and the self-detection wrapping film and the part between the surface of the flange short pipe and the self-detection wrapping film are both coated with multi-stage layers. According to the loose force transmission insulation flange and the surface crack detection method thereof, the function of an insulation flange and the function of a loose force transmission flange are combined, the loose force transmission insulation flange is formed, the insulation flange adopts the loose telescopic connector, an insulation error of a pipeline can be compensated, and mounting and dismounting of the flange are facilitated; the insulation flange adopts a force transmission rod structure, and accordingly the pressure of the pipeline is transmitted; and in addition, the surfaceof the flange is additionally provided with the self-detection wrapping layer, the high-cost defect of detection by a precise instrument in the prior art is abandoned, and crack self-detection is conveniently carried out on the flange by a user before actual using.

Description

technical field [0001] The invention relates to the field of insulating flanges, in particular to a loose sleeve force transmission insulating flange and a method for detecting surface cracks thereof. Background technique [0002] Buried long-distance pipelines generally use pipelines of various materials according to terrain and geological conditions. Underground oil and gas pipelines, tap water pipelines, heat pipelines and other metal facilities are not only densely distributed and have complex geometric shapes, but also are located in complex soil environments, so they will be severely disturbed by strong soil corrosion and stray currents in the ground. When connecting two kinds of pipelines, such as direct connection between PCCP pipeline and steel pipe, in the soil, because the steel pipe is more susceptible to electrochemical corrosion than PCCP, the steel pipe is equivalent to the anode of PCCP, and the corrosion will be intensified when connected with PCCP, and the ...

AI Technical Summary

Problems solved by technology

Compared with the design life of the project, the service life of the insulating material is short, and multiple inspections and replacements are required during the design life of the pipeline

[0006] In addition, the surface of the insulating flange is required to be free of cracks, because once cracks appear, there will be a greater risk of separation between the connecting pipes. However, in the prior art, the detection of cracks on the surface of insulating flanges is usually only a simple qualification during the production process. Inspection, crack detection is basically not performed before actual use in the later stage, and even if crack detection is performed before use, the detection method often requires the use of sophisticated detection instruments, and the detection cost is high

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