vapor recovery unit (VRU) : 1. In production operations, equipment designed to recover light ends that are released from oil in a stock or other tank. 2. In petroleum refining, a process unit consisting of a scrubber and a compressor designed to recover petroleum from hydrocarbon vapors and safely to handle toxic gases. viscous : having a high resistance to flow. volatile : readily vaporized. volatility : the tendency of a liquid to assume the gaseous state. water cut : to locate the oil-water interface and use the location to measure the volumes of oil and water in a shore tank or ship compartment.
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