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How Small Is Too Small A Pipe To Require A Thermal Psv?
#1
Posted 17 November 2016 - 08:04 PM
Can anyone advise: What it the definition of a "small diameter?"
I have a 4 in pipe of 10 ft length that can be potentially liquid full upon isolation. I would love to write off as not requiring a thermal PSV, if it is allowed.
#2
Posted 17 November 2016 - 09:55 PM
Who is the guideline from? What are the circumstances? What is the fluid in question? What are the probabilities of the blocked-in liquid achieving rupture pressure in the pipe?
If the "guideline" comes from the company you work for, you may have to follow that advice - unless you have the initiative, justification, or guts to challenge it.
If it comes from someone who is not a stakeholder in your work results, then I would seriously challenge his/her recommendation.
If the liquid in question that is unidentified by you turns out to be cooling water or something similar in properties, I'd just forget about this "expert" advice and install a $50 1/2" thermal relief valve.
#3
Posted 18 November 2016 - 12:03 AM
If you are working with a world scale LNG plant, small diameter can be 10 inches. So, be wary. In all my years, I have never seen a thermal relief valve provided for a 4 inch pipe 10 feet long.
Bobby
#4
Posted 18 November 2016 - 05:47 AM
Refer to the following:
http://www.chemwork....l_expansion.pdf
I'd like to quote the last term - but I am not sure where this criteria come from:
(Quote/)
the quantity of blocked in liquid is higher than 0.5 m3
(/Unquote)
~Stefano
Edited by sgkim, 18 November 2016 - 05:53 AM.
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