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Hello everbody
I have designed a PSV for fire case for a huge horizontal vessel (Vol ~ 700 m3). And for 2 phase flow I got a big PSV orifice size!
Although, we do not consider time factor while calculating the fire load but revisiting the problem revealed that it would take near about 3 hours to reach the boiling temperature !!!.
Can I just not consider the thermal expansion of liquid & leave the vapour + liquid & then vapour loads for calculating the PSV since 3 hours should be enough with adequate fire fighting to control the fire.
Pl. comment
Best Regards
Kiran
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Psv Fire Case
Started by kirangparihar, Dec 15 2006 03:33 AM
2 replies to this topic
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#2
pleckner
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Posted 15 December 2006 - 02:27 PM
"Can I just not consider the thermal expansion of liquid & leave the vapour + liquid & then vapour loads for calculating the PSV since 3 hours should be enough with adequate fire fighting to control the fire."
Your question is totally confusing, but API RP521 Paragraph 3.4 does allow some consideration for time (10 to 30 minutes) under some circumstances. And I've done so in the past as well. This doesn't necessarily mean you should, only you can make that decision. I will tell you that one of the most recent catastrophies in the U.S. (the BP Texas City, Tx refinery explosion) happend after more than 12-hours of a screw up.
Talk to your safety people and/or management. That's the best advice I or anyone else should be giving you in this case.
Your question is totally confusing, but API RP521 Paragraph 3.4 does allow some consideration for time (10 to 30 minutes) under some circumstances. And I've done so in the past as well. This doesn't necessarily mean you should, only you can make that decision. I will tell you that one of the most recent catastrophies in the U.S. (the BP Texas City, Tx refinery explosion) happend after more than 12-hours of a screw up.
Talk to your safety people and/or management. That's the best advice I or anyone else should be giving you in this case.
#3
kirangparihar
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Junior Member
Posted 16 December 2006 - 05:37 AM
QUOTE (pleckner @ Dec 15 2006, 03:27 PM) <{POST_SNAPBACK}>
"Can I just not consider the thermal expansion of liquid & leave the vapour + liquid & then vapour loads for calculating the PSV since 3 hours should be enough with adequate fire fighting to control the fire."
Your question is totally confusing, but API RP521 Paragraph 3.4 does allow some consideration for time (10 to 30 minutes) under some circumstances. And I've done so in the past as well. This doesn't necessarily mean you should, only you can make that decision. I will tell you that one of the most recent catastrophies in the U.S. (the BP Texas City, Tx refinery explosion) happend after more than 12-hours of a screw up.
Talk to your safety people and/or management. That's the best advice I or anyone else should be giving you in this case.
Your question is totally confusing, but API RP521 Paragraph 3.4 does allow some consideration for time (10 to 30 minutes) under some circumstances. And I've done so in the past as well. This doesn't necessarily mean you should, only you can make that decision. I will tell you that one of the most recent catastrophies in the U.S. (the BP Texas City, Tx refinery explosion) happend after more than 12-hours of a screw up.
Talk to your safety people and/or management. That's the best advice I or anyone else should be giving you in this case.
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