Now 10% criteria is only applied on built-up backpressure i.e. ![]() total backpressure.īecause the flare system superimposed backpressure is already set at 10.5 psig, built-up back pressure has to be the difference of total backpressure and superimposed one i.e.: 20.3-10.5=9.8 psig ".for a power failure design contingency gave a backpressure of 20.3 psig on the PSV outlet." means this is superimposed backpressure plus built-up one i.e. ![]() ![]() "A flare system superimposed backpressure is set at 10.5 psig." means before PSV opening the pressure in PSV tail pipe is 10.5 psiog.
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