This paper describes the results of an ASME sponsored research program on the measurement of high pressure-high temperature steam and water flows. Results obtained during tests at three central stations, a steam and water laboratory, and three hydraulic laboratories are described. It was determined that coefficients of ASME orifices or nozzles are within a tolerance of 1 percent of ASME coefficients providing that the beta ratios were limited to a maximum of 0.60 for nozzles and 0.65 for orifices and that materials are selected so that the surfaces remain in an essentially as new condition, and frequent inspections are made to verify surface and cleanliness.

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