Referring to the illustration, suppose the oily-water separator vessel compound gauge is showing an unusually deep vacuum for operating in the separation processing mode with the separator service pump running. The oil content is 8.3 ppm. What is most likely the cause? GS-0175

Correct Answer: Option A — The oily-water separator bilge suction strainer is clogged.

Deep vacuum readings on the suction side of a separator pump signify a flow restriction. A clogged bilge suction strainer prevents adequate fluid volume from reaching the pump, causing the vacuum to increase. This condition must be addressed to ensure the separator operates within its design parameters for effective oil-water separation.