Does a PSV has a MAWP?
Does a PSV has a MAWP?
(OP)
Hello
I have a very simple question.
Does a PSV itself has a MAWP? I am just asking as I have never seen it on a data sheet or a name plate but since the PSV has a CRN I assume it has a MAWP associated to it.
Thanks
I have a very simple question.
Does a PSV itself has a MAWP? I am just asking as I have never seen it on a data sheet or a name plate but since the PSV has a CRN I assume it has a MAWP associated to it.
Thanks





RE: Does a PSV has a MAWP?
RE: Does a PSV has a MAWP?
If the PSV does have a MAWP it must be higher as or equal to the MAWP of the vessel its protecting. However, I clould not find anything if a PSV does have a MAWP like a pump has for instance.
RE: Does a PSV has a MAWP?
http://www.eng-tips.com/viewthread.cfm?qid=159483
RE: Does a PSV has a MAWP?
Thanks but I am not asking how the set pressure of the PSV relates to the MAWP of the vessel. What I am asking is, if the PSV as a device itself has a MAWP?
Lets assume I have a vessel, which MAWP is 215 PSIG. So I would set my PSV at 215 PSIG or lower. However, the PSV itself is a registered fitting/valve and has a CRN number.
The MAWP of the PSV (if there is one) can be and should be much higher than the MAWP of the vessel. However, I have not seen any MAWP noted on any PSV data sheet or name plate.
So the question is really does the PSV has a MWAP.
RE: Does a PSV has a MAWP?
RE: Does a PSV has a MAWP?
Therefore for a set pressure of 200 PSIG, a PSV with 10 % overpressure, the "MAWP" would be 220 PSIG. In that instance, it is not designed to operate higher, therefore this should be the PSV MAWP.
Per ISO, only the term Safety Valve is used regardless of application or design.
RE: Does a PSV has a MAWP?
RE: Does a PSV has a MAWP?
The PSV is the last protective barrier before the catasprophe and in this case if it fails it is the whole installation that will be damaged, nothing serves to assign to it a MAWP because it must open at set pressure.