Thermal relief on LPG lines
Thermal relief on LPG lines
(OP)
Hi everyone
I read the following in a FEED:
"LPG - any section more than 500L of LPG that can be blocked in shall be provided with a TRV."
Do you have any idea why there is a limit to the smallest volume that requires a TRV? I'd imagine a rupture in the line or flange or a failing gasket is still possible even with small volumes. I would have said that ANY volume that can be blocked in needs a TRV.
Thanks!
Gareth
I read the following in a FEED:
"LPG - any section more than 500L of LPG that can be blocked in shall be provided with a TRV."
Do you have any idea why there is a limit to the smallest volume that requires a TRV? I'd imagine a rupture in the line or flange or a failing gasket is still possible even with small volumes. I would have said that ANY volume that can be blocked in needs a TRV.
Thanks!
Gareth





RE: Thermal relief on LPG lines
Yes, for blocked in LPG if ambient temperature conditions and/or sun radiation may lead to a prevailing pressure exceeding piping design pressure, no limitation can be applied to the blocked in volume...
RE: Thermal relief on LPG lines
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Thermal relief on LPG lines
you must get smarter than the software you're using.
RE: Thermal relief on LPG lines
BigInch - you said it'd work for you, do you mean that you agree with the FEED (i.e. not required on smaller volume lines)?
RE: Thermal relief on LPG lines
* available surface area for heat input
* amount of voume that could be expected to spill from each PSV (where do the PSV outlets go?)
I have not vetted this article for correctness, but it may be of some benefit here:
http://webwormcpt.blogspot.ca/2008/07/thermal-reli...
RE: Thermal relief on LPG lines
you must get smarter than the software you're using.
RE: Thermal relief on LPG lines
BigInch - Why's that? A 15m (50ft) length of 200NB pipe (8") is just less than 0.5m3. To me, if a line that size is liquid full, it'd be a serious problem, especially if it is one of the lines just after the outlet nozzle of the LPG sphere... Or am I missing something?
Snorgy - LPG on our site is vented to atmosphere
Thanks again for the help guys!
RE: Thermal relief on LPG lines
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Thermal relief on LPG lines
RE: Thermal relief on LPG lines