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Title: Witnessing Orifice Meter Calibration And Field Tests
Author: Bill Carnahan
Source: 1982 International School of Hydrocarbon Measurement
Year Published: 1982
Abstract: The primary functions of a witness, as related to the gas business, is to insure the accuracy and validity of measurement and physical tests which are essential for proper payment for the products delivered. The role is very important and the person should be one of high integrity with experience in the science of measurement. The witness should not be presumptuous regarding the skills or technical knowledge of the technician or representative who is to conduct the tests. With the advent of the pneumatic tester, many of the new faces in measurement have never seen a water column manometer. On a recent test a new technician (also a part-time wheat farmer) was asked what an inch of water meant to him. His reply was classic: It would probably mean about three more bushels to the acre.

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