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Title: Critical Flow Orifice Provers
Author: J. C. Diehl
Source: 1929 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1929
Abstract: The critical flow orifice prover may be used for testing positive displacement meter at the pressure of 15 pounds gage or more by passing gas or air through the meter and the orifice, and discharging it into the atmosphere. If the proof of the meter does not change with changes in pressure (it should not) the time required for a full circle reading of the proving hand of the index will be the same for any particular orifice and kind of gas regardless of the various pressure.

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