ho to find relieving temprature
ho to find relieving temprature
(OP)
hi
i am new to psv sizing
i want to know how to find relieving temperature for psv sizing , fluid is LPG.
i am new to psv sizing
i want to know how to find relieving temperature for psv sizing , fluid is LPG.





RE: ho to find relieving temprature
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: ho to find relieving temprature
i have to size psv for lpg bullet of 7.5m dia and 44m long
i am going to size psv for fire case.
so 1st i used equation q=21000 F A^0.82
in this i am stuck with A
since bullet is 75% filled how do i find wetted area (A).
i want to go step by step
thanx for response.
RE: ho to find relieving temprature
but this seems to be wrong
so how should i proceed?
RE: ho to find relieving temprature
RE: ho to find relieving temprature
Reason I ask, in U.S. for LPG, OSHA supercedes API for heat input equation. OSHA stipulates Q (Btu/hr) = 34,500(Total Surface Area)0.82
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: ho to find relieving temprature
is it true what Duwe6 is saying?
because A is wetted area & according to what i know wetted area means surface area of vessel which is in contact with liquid
please correct me if i am wrong
latexman,
yes i am using API 520 & 521
the project in which my company working on is about LPG terminal situated in south africa
this bullets will store LPG coming via boat from sea side
is there anything more which i should mention?
please let me know
& guys please help me to size this psv so please stay till end with me.
RE: ho to find relieving temprature
but i dont know how to obtain most of the various variables involved in these equations.
RE: ho to find relieving temprature
If you have specific questions, please ask. We will not do your job for you.
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: ho to find relieving temprature
I have taken MAWP as set pressure
RE: ho to find relieving temprature
i am new to this psv sizing
i know no one will do my job for me
but this is 1st time for me
i have referred all online stuff for psv sizing also API's
but there is no one to tell me whether my thinking is right or wrong, hence this
there are few more questions from my side regarding psv sizing
RE: ho to find relieving temprature
Fire scenario, so accumulation = 21% above MAWP, and overpressure = 21% above set pressure.
Sizing pressure = 1.21 x MAWP.
Sizing temperature is the LPG vapor/liquid equilibrium temperature coincident to the sizing pressure.
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: ho to find relieving temprature
RE: ho to find relieving temprature
RE: ho to find relieving temprature
Second thing many of the codes (for example ANSI K61.1 and its new GSPA equivalent for ammonia) require use of the entire surface area in the determining the sizing case for fire.
For LPG or ammonia the gas reliving temperature is the equilibrium temperature at the relieving pressure. As Latexman stated.
The same would apply for a steam boiler.
Good luck.