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发表于 2022-4-15 20:34:22
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根据ASME Section I 2019, PG-99并没有明确的规定。但是,PG-99.1规定,水压试验时,各部件一次应力不得超过屈服强度的90%。也就是说,如果在实际水压时,如果实验压力超过了1.5MAWP,但是各部件一次应力低于90%屈服强度,都是可以接受的。
至于,6%的说法是来源于老的ASME规范。
PG-99.1 Hydrostatic pressure tests shall be applied
by raising the pressure gradually to not less than 11/2
times the maximum allowable working pressure as
shown on the data report to be stamped on the boiler.
No part of the boiler shall be subjected to a general membrane
stress greater than 90% of its yield strength (0.2%
offset) at test temperature. The primary membrane stress
to which boiler components are subjected during hydrostatic
test shall be taken into account when designing
the components. Close visual examination for leakage is
not required during this stage.
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