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Title: Critical Flow Orifice Prover
Author: William R. Hobbs
Source: 1965 Western Gas Measurement Short Course
Year Published: 1965
Abstract: Before considering the critical flow prover for testing positive meters in the field, there are several things that should be taken into consideration. The loation of the mter nuist be such that the Aassing of large volume of gas is not hazardous. The station should, Tf economically possible, be designed so that the meter can be completely biassed from the rest of the meter station, leaving the regulators to control the pressure. The selection of reliable free-operating, positive-cloiing valves on both the inlet and outlet of the meter is also very important.

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