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1. Ensure that the user of any differential pressure flow meter knows the performance characteristics of the meter over a range of Reynolds numbers as applicable or defined by tests,

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This document, for single-phase gas measurement, provides guidance in the following areas to allow the user to achieve a targeted uncertainty of measurement: - selection of flow meter type: differential pressure, displacement, ultrasonic, Coriolis, vortex, turbine, thermal, and others; - associated instrumentation for measuring fluid properties and flowing conditions, such as pressure and temperature transmitters, densitometers, gas chromatographs; - obtaining and use of gas composition or other analytical data; -design and installation requirements of the measurement system; - inspection, verification, and calibration practices of flow meters and their associated accessory instrumentation; - simplified uncertainty calculations with examples to illustrate the methodology.

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These methods require a knowledge of the equilibrium bubble point pressure (vapor pressure) at the measured conditions.

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