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Title: Differential Testing Of Dresser Rotary Meters
Author: Patrick H. Loughran
Source: American Gas Association 1976
Year Published: 1976
Abstract: Differential pressure testing of rotary gas meters is a long established and widely used method for determining if the operating accuracy has changed enough from the original or new condition accuracy to require cleaning, repairing, or possibly replacement of the meter to restore required accuracy. Differential testing of a rotary meter in service is normally much simpler and more practical for determining if any significant change in accuracy has occurred than any conventional proving methods. Although differential testing is basically simple and technically correct, some installation or operating conditions may cause difficulties in making tests and/or readily interpreting the test results particularly in relation to previous test results at significantly different meter pressure and flow rate.

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