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Fire Scenario restrictions?

Fire Scenario restrictions?

Fire Scenario restrictions?

(OP)
I have a heat exchanger that external fire is considered the controlling scenario for over-pressurization.  Currently, relief is in the form of a 6" x 10" relief valve on the inlet to the shell ~1000 ft. away in another building.

I know per ASME XIII that an ASME coded vessel requires at least a minimally sized relief valve on its shell.  Is there a restriction as far as how "local" the relief valve needs to be or is the only requirement that it passes 3% inlet pressure drop?

RE: Fire Scenario restrictions?

I don't know of any absolute distance restrictions for vapor scenarios (other than 3% loss as you mentioned).  But you are going to need a long run of large pipe to keep under 3% (if even possible).  This is going to be a high installation cost solution.  Try adding fire proof insulation or something like that to reduce the required rate and decrease the size of that relief valve.

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