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Low Flow in Pipes- posted in Ankur's blog

Psv Size For Reduced Pressure

Started by mbilal83, Mar 24 2015 02:20 AM

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#1 mbilal83

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Posted 24 March 2015 - 02:20 AM

We had a PSV on an existing vessel set at 1300 psi.
Now we have new application for which the PSV size is calculated to be 200 psi.
Can the PSV be modified on field to work on new pressure. Can the orifice be changed ?

#2 shan

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692 posts

Posted 24 March 2015 - 09:47 AM

You may reset PSV setting pressure but not modify the orifice area.

#3 Guest_zulfiqar_*

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Posted 24 March 2015 - 10:12 AM

1. no you cannot reset a psv by more than plus minus 10% using the same spring

2. you also cannot change the orifice because you have not done any flow calculations for the revised comdition. Even if you do it , your pressure difficulty will not allow you to do that

regards

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