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Title: Field Testing Large Displacement Meters A Panel Low Pressure Proving, Critical Flow Proving And Transfer Proving
Author: Clyde C. Bradford
Source: 1978 International School of Hydrocarbon Measurement
Year Published: 1978
Abstract: Low Pressure Flow Proving was so named because it is used to test meters at pressures which die slightly above atmospheric pressure but slightly less than 15 psig. Either gas or air may be used. The low pressure prover is essentially a pipe tap or flange tap orifice meter which has been made adaptable as prover by the use of quick reference tables. These tables enable the use of elementary mathematics to make a comparative calculation of the rate of flow registered by the meter under test and the prover. Thus, the proof of the meter can be readily established. During the late 1950s, the trend had been towards the use of portable blowers in field testing large displacement meters with low pressure flow provers because of the simplicity of the procedure and because of the greater safety corresponding to this method ot testing. The drawback to tasting with blowers hao been the temperature- distortion, immediately before entering the meter, caused by the churning of air in the fan housing.

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