March 2000

Instrumentation/Control

Controlling vessels and tanks

Understanding their functions will improve control

Driedger, W. C., Colt Engineering

Controlling a vessel should be a very simple matter – they don't really do anything! But then, if they don't do anything, why are there so many of them? And why do they have so many different names? Going through a typical set of piping and instrumentation diagrams (P&IDs), you find the following vessels:        • Degassing drum        • Gas separator • Feed flash drum • Reflux accumulator • Surge drum

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