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Title: Field Testing Using A Low Pressure Prover
Author: R. A. Sutton
Source: 1967 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1967
Abstract: Predecessor class instructors and speakers have done well in covering the area of field testing a displacement meter using a low pressure prover. A perusal of past literature on this subject would serve to confirm that this type of prover came into existence and was accepted by the industry approximately twenty-five years ago. The low pressure prover is essentially a pipe tap or flange tap orifice meter which has been made adaptable as prover by the ingenious 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. The name low pressure prover implies the prover was used at pressures slightly above atmospheric pressure. However, today vacuum proving has generally been accepted in the industry because it tends to reduce the temperature gradient between the meter and prover. Reiterating, two types of low pressure provers have been introduced namely, the Metric Orifice Flow Prover (pipe taps) and the Flange Tap Orifice Flow Prover. Also, two associated methods of testing have been described, pressure proving and vacuum proving. Of course, the allotted class time does not allow in depth discussion of both types of provers and proving methods, however, the Metric type prover and pressure proving will be mentioned to show difference in prover construction and applicability, while vacuum proving a displacement meter with a Flange Tap Prover will be dealt with more extensively.

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