Air tightness test of welded steel pipe
2021-07-13 15:48:54 COMMENT：0 HITS：
Air tightness test of welded steel pipe
(1) Air tightness test
(1) Air tightness test
The test of underwater air tightness by flushing 1.2MPa gas in the pipe
Air tightness test is generally used as the test medium, and the stainless steel welded steel pipe is immersed in water to check the leakage. The stainless steel welded steel pipe is tested under pressure of 1.4mp.
Operation method: plug both ends of the pipe with a pressure gun and seal it; The air is supplied by foot pedal switch, and the air pressure is 1.4mp; Put the pipe into water and keep the pressure for 10 s-15s; No bubbles on the weld bead are qualified.
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(2) Hydrostatic test
Easy to understand is a method of checking leakage with one stone and two sculptures. In order to find out the leakage of the pipeline, the hydraulic test method of the external pressure of the pipe can be used to detect the leakage of the heat exchange pipe, and the water is sent to the shell for a certain time. The pipe leakage at both ends of the tube plate can be visually inspected and the leaking pipe recorded. If there are few leaking pipes, the ends of the orifice can be plugged with tapered metal plugs. When the pressure on the side of the pipe is high, it will be more reliable to weld it after the plug, but it is noted that the pipe is blocked. In order to eliminate leakage, the number of tubes requiring plugging treatment shall not exceed 10%.
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