Under what conditions do pressure vessels need to undergo a vacuuming test? Is a vacuuming test required whenever there is negative pressure?
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Under what conditions do pressure vessels need to undergo a vacuuming test? Is it necessary to conduct such a test whenever there is negative pressure? What should be the appropriate duration for maintaining the vacuum state? The design drawings indicate either 1 hour or 24 hours; I’m really confused
I really haven’t encountered it before. Waiting for experts to provide an answer. @gjyzb @wiseboy @great.wang @humanrzm
Generally, negative-pressure containers don’t seem to have this requirement; only vacuum-insulated containers do.
Didn’t see such a requirement in the standards?
In some cases, the design institute explicitly required a vacuum testing procedure; in other cases, the management ordered vacuum testing after observing a negative pressure condition. I think it’s possible to operate under negative pressure, and as long as the checks for negative pressure show no issues, there should be no need to conduct vacuum testing
Generally, only the jacket of low-temperature adiabatic containers is evacuated.
I really have never seen a vacuum pumping test. Could the original poster post the drawings? Even for vacuum containers, there is no need to conduct vacuum pumping tests; firstly, the margin in the formulas used to calculate negative pressure is already quite large, and secondly, the maximum operating external pressure of ordinary vacuum containers (except in cases of actual vacuum conditions) certainly cannot reach -0.1 MPa. I’m not sure if the vacuum testing mentioned by the poster refers to a vacuum chamber test
I specifically asked a foreign colleague who went to Morimastu with me, a design engineer, about this issue, and he said it is ensured through the design. In fact, a vacuum test can be carried out. Just find a well-known water ring vacuum pump in Foshan.
I specifically asked a foreign colleague who went to Morimastu with me, a design engineer, about this issue, and he said it is ensured through the design. In fact, a vacuum test can be carried out. Just find a well-known water ring vacuum pump in Foshan.
Vacuum tests for large-scale equipment, such as the air-cooled island in power plants manufactured by SPX, are generally carried out on-site.
Equipment that operates in a vacuum requires a specially designed structure for reinforcement