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hi
According to API 527 there are some allowable leakages for psv seat tightness test at 90%set pressure.but it is not mentioned for pressure less than 90% set pressure.shall it be zero leakage for pressure<90%set pressure or not?
regards
rohollah
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Psv Seat Tightness
Started by rohollah, Nov 30 2011 04:42 PM
1 reply to this topic
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#2
Lowflo
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Posted 30 November 2011 - 05:36 PM
No, there's always going to be some amount of leakage, it's just not quantified at pressures < 90% of set pressure. Obviously, at lower pressures the leakage rate will be less.
If your tolerance for leakage is low, then consider using a soft-seat valve or a rupture disk under the PSV.
If your tolerance for leakage is low, then consider using a soft-seat valve or a rupture disk under the PSV.
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