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Title: Liquid Meter Proving Techniques
Author: Carl Green, Jr.
Source: 1978 International School of Hydrocarbon Measurement
Year Published: 1978
Abstract: No one knows for sure, but chances are it happened with the inslal1afion of the first, maybe the second, flow meter that gave rise to the measurement persons famous proverb, that meter is no good. The basis for this statement is really that, in comparing the meter to some other device, it does not agree it is not accurate. But what is accuracy? Accuracy is the ratio of indicated volume to actual volume. Indicated volume is easy to determine just look at the totalizing register for the meter in question and it will show the indicated volume. Now comes the tricky part in knowing just what the true or actual volume is. Common industry practice has been to use one or more of several types of provers to prove meters, and thereby determine a meter factor which is a function of the indicated volume/actual volume ratio. Without question, all components of a metering/proving system are assumed to be functioning properly, save the meter. The poor ole dumb meter is always the first one to be blamed if current meter factors do not agree with previous ones. The meter is showing what it can do under a given set of conditions that may or may not have been the same as they were in developing the previous meter factors. In any comparison, one must be sure to compare apples to apples, not compare apples to oranges and assume that both are equal.

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