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Psv Rbi - Dangerous Fail - Open Above Set Pressure-Question

prd set pressure rbi api 581 asme section viii division 1

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#1 Paul_Needham12

Paul_Needham12

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Posted 04 April 2019 - 01:07 AM

Regarding PRD failure mode, can anyone please explain why the Open Above Set Pressure (OASP) is classified as Dangerous fail in API 581 section 7.1.3 when test point opens above 1.3 times of set pressure?

But in ASME Section VIII, Division 1, Para UG 125©(3) stipulates that the PRD shall prevent the pressure from rising more than 10% above the MAWP.

Which one is right? 1.1 times or 1.3 times?

 

Many thanks






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