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During 1996 and 1997 a steam and water separator used in the nuclear power industry was tested with hydrocarbon fluids to evaluate its potential for use in the hydrocarbon production industry. Separation efficiencies were measured over a range of liquid flows, gas flows, gas/liquid ratio, and water cut. A non-dimensional correlating parameter was developed from a simple model of the second stage centrifugal separator prior to testing with hydrocarbons. The correlating parameter was used to collapse the liquid removal efficiency data for high, and low pressure steam and water into a single characteristic curve. The characteristic curve identifies the condition where liquid removal efficiency commences to decrease. This paper outlines the development of the correlating parameter, provides the characteristic liquid removal efficiency curve obtained with steam and water, and compares liquid removal efficiency data with hydrocarbon fluids.