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SAFETY VALVE

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prakunj

prakunj

Chemical
Joined
Nov 10, 2008
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As per API-520, the maximum allowable accumulation is 10% of MAWP for non-fire case & 21% of MAWP for fire case. Normally with fire, the metal temperature will increase & reduce the mechanical strength of metal.

Why the % accumulation will increase for 10% to 21% for fire case?
 
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Perhaps is safer to design a system to withstand 21% overpressure, rather than 10% only, right?
cheers,
gr2vessels
 
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