Pop Test Failures 1

[Roy31]

Can anyone tell me what they're considering a pop-test failure. Specifically, this would involve relief valves popped in an as received condition. As you are all probably aware, a Pop-test failure can be used as a key performance indicator (KPI) for trending over a period of time, and I'm finding there seems to be much disagreement on what's considered a pop-test failure. The more discussion the better, as the objective of this question is to calibrate myself with the current industry best practice and definition of a pop-test failure (i.e. petrochemical or refining industry).

 

[The Obturator]

Suggest you follow the guidelines in API-576 Inspection of Pressure-relief Devices. The issues of pop tests etc., are well represented there.


*** Per ISO-4126, the generic term
'Safety Valve' is used regardless of application or design ***

*** 'Pressure-relief Valve' is the equivalent ASME/API term ***

 

[Roy31]

Survey says........See API-576. It would be more interesting to find out what everyone else is doing........It's called bench marking!

These are my current views. What is everyone else doing? Your opinion would be greatly appreciated.......one and all!

1) The measured set pressure should be consistent with the stamped set pressure within the tolerances required by Table 3.6.3.1-2 in ASME BPVC.XIII Deviation would be a failure
2) The measured set pressure tolerances for boilers, ASME BPVC.I, PG-72.2 Deviation would be a failure
3) leaking RV's < 90% of the set point during a seat tightness testing in my opinion would be a fail. API RP 527
4) Inspection of RV with evidence of plugging would be a fail in my opinion.
5) A stuck closed valve, even after cleaning, and testing to 130% of the set point pressure and still stuck shut would be a fail in my opinion. API 576

Thanks