October 2004

Vessels/Internals

Cure liquid carryover from compressor suction drums

Here's how to apply mist eliminators for higher throughput and efficiency

Kalis, B., Amistco Separation Products, Inc.

When the gas approaching a compressor is wet, traces of aqueous or organic liquid may escape the inlet knockout drum—often intermittently—and silently damage the compressor. Telltale signs include pitting corrosion, salt deposits and diluted lubricants. Instead of trying to repair symptoms, look for the root cause, which usually involves the mist eliminator in the knockout drum (Figs. 1, 2 and 3). Problems may include improper mist eliminator specifications, overloading, uneven velocity profiles, incorrect installation, high liquid viscosity, waxy deposits, liquid slugs, foaming and several other possibilities.  F

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