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Title: System Of Transfer Testing
Author: Gary L. Hanson
Source: 1970 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1970
Abstract: To field test meters there are presently three alternatives available for a gas company: 1) the low pressure prover, 2) the critical flow prover, and 3) the transfer prover. The first two methods involve the measurement of several variables which in turn can cause the compounding of errors before the final accuracy is calculated. The transfer prover allows the sensing of temperature and pressure differences to be read directly on a console along with the uncorrected proof in percent. Therefore, results obtained from a transfer prover should be more accurate and compare more favorable to the more accepted standards namely, piston or bell provers. Actual test results have shown this thinking to be true. Southern California Gas Company, one of the pioneers in transfer proving, found that transfer prover tests on several hundred meters indicated a standard deviation of 0.66 percent, as compared to 1.05 percent for the flow prover. Both the transfer prover results and the flow provei* results were referenced to their bell prover

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