A kind of light-weight inner expansion seal medium and high pressure pipeline maintenance and emergency repair pipe card

Abstract

The invention discloses a maintaining and first-aid repairing pipe clamp for sealing a middle-high-pressure pipeline through light inner-expansion. The pipe clamp comprises two symmetrically-arranged light semi clamps of the same structure, an annular sealing rubber strip, axial sealing rubber strips, an agent injection valve, a semi clamp connecting bolt and nut assembly and a supporting adjusting assembly. Through manual extrusion deformation of the corresponding axial sealing rubber strips on the two light semi clamps, axial sealing of the pipe clamp can be achieved; the agent injection valve injects an injection agent into injection agent filling cavities of the light semi clamps, and the annular sealing rubber strip is pressed on a damaged pipeline to achieve circumferential seal of the pipe clamp, so that blockage of large-damage (cracking or punching) leakage of the middle-high-pressure pipeline can be achieved; and compared with an existing sealed cavity type pipe clamp, the weight can be reduced by more than 40%, the better pipeline deviation application is achieved, and the higher leakage blockage success rate is achieved; the sealing pressure is large and adjustable, the circumferential seal is even, the corrosion-resisting performance is good, mounting and adjusting are easy, convenient and labor-saving, and a diver can conveniently carry out underwater construction.

Description

technical field [0001] The application relates to pipeline maintenance and emergency repair equipment, in particular to a light-weight internal expansion sealed medium and high pressure pipeline maintenance and emergency repair pipe clamp. Background technique [0002] Mechanical pipeline maintenance and repair pipe clips are widely used in maintenance and repair operations such as corrosion perforation, weld cracks, and accidental damage with little damage, because there is no need for welding in the plugging process and the construction speed is fast. For medium and high pressure pipelines, the mechanical pipeline maintenance and repair pipe clamps designed and produced in China generally adopt a sealed cavity structure, that is, two semicircle and half clamps are connected as a whole by bolts, and they are placed at the leakage of the pipeline, and the two semicircle and half clamps pass through Axial sealing strip sealing, the circumferential gap between the two ends of ...

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Problems solved by technology

[0004] However, in this mechanical pipeline maintenance and repair pipe clamp, the sealing of the circumferential gap between the two ends of the fixture and the outer surface of the pipeline is realized by the compression and deformation of the circumferential sealing strips embedded in the two ends of the pipe clamp. The deformation range is small. If the deformation is too large, the sealing strip will be crushed. If the deformation is too small, the plugging pressure will not be reached. The circumferential gap between the two ends of the clamp is determined by the deviation of the pipe clamp and the inner and outer diameter of the pipe, and the shape and position tolerance. And the installation deviation of the pipe clip is determined, and it is non-uniform in the entire circumference. The plugging pressure of the pipe clip is the minimum sealing pressure in the circumferential direction of the pipe clip

Therefore, the pipe clamp has high requirements on the deviation of the outer diameter of the pipeline and the tolerance of shape and position, which limits its applicability and the success rate of plugging; in addition, due to the large pressure, the existing pipe clamp body is made of metal forging or welding Parts processing, the wall thickness of the pipe clamp is thick and heavy, and the installation requires the cooperation of large construction machinery, which is difficult to install and is not convenient for underwater construction

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