Sheiko
Your point is not clear to me???
The issue is definitely part of the real world.
MAAP = MAWP + 16%
When MAWP is not defined you may consider design pressure.
Don1980
Thank-you for the reply. Its always interesting to discuss relief valve issues with experienced people.
You obviously know your standards, and based on your reply I was inspired to re-visit the ASME code.
I believe that the answer lies with ASME UG-140. Before introduction of this...
I have been scrutinising the codes to find the answer to the following question.
According to API-STD-521 sect 4.1, pressure-relieving devices are installed to ensure that a process system or any of its components is not subjected to pressures that exceed the maximum allowable accumulated...
I have just received the new revision of API-521 (2007). In the new revision it is clearly written that, if accepted by local regulation, relief valves on unwetted vessels may be replaced by other means of protection such as water spray or depressurization.
Also the new revision distinct...
don1080,
Very interesting! Where do you have this information from. I would really like to know if UG-140 have been used to exclude fire case on a vapour filled vessel.
Thanks a lot for all your valuable inputs. Unfortunately the conclusion is not as clear as I hoped for.
It seems that ASME require a PSV til be installed even though fire is not real source of overpressure.
I dont have a problem with installing a depressuring valve. However it really hurst my...
It is well known that a PSV does not provide any protection against failure due to fire on an unwetted vessel. Many recognised companies practice not to install PSVs on unwetted vessel if fire is the only contingency.
Does anyone know of any officel reference, ASME clause or other codes that...
