Review unit-wide impacts on closed-drain drums
API 521 standard helps decipher the correct operating pressure for this system
Closed-drain drums are generally intended to receive hydrocarbon-drained liquids from various upstream sources. These drains may be maintenance drains, continuous-process drains and open-hazardous drains from drip pans. The vent line of this vessel type is normally routed to the low-pressure (LP) cold vent headerultimately culminating into a LP cold vent tip. Liquid from the drum is removed periodically. The drum inbreathes during pumping out and out breathes during liquid inflow through the vent line on top.
The question is what should the design pressure be without any liquid seal at the vapor outlet to prevent air ingress? To a process designer, a simple design i
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