Dear all.
Is it reasonable to put flame arrestor at the end of psv discharge pipe? The psv is placed at the top of spherical tank with hydrogen. The hydrogen is under pressure and psv is set at 26 bar g. Now, the user/owner of that tank wants to install end-of-line deflagration flame arrestor at the end of psv discharge pipe. The problem is: psv capacity is so big that possible flame arrestor is extremely huge. Diameter of discharge pipe (existing) is DN80 and selected flame arrestor has DN800 inlet!! Isn't it something strange? Does it protect us against something or maybe it's even dangerous to do such thing?
on one hand: we want to prevent possible fire to get into the tank
on the other hand: is it really possible during discharge of psv? Discharge velocity is high and after that psv closes. Any flow restrictions at psv discharge are rather not desirable. Flame arrestor could be blocked.
What do you think?
I couldn't find anything about such case in the internet. Are there any codes or standards? All manufacturers provide such flame arrestors only for low pressure storage tanks. So, maybe in that case it is not applicable?