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Title: Mechanical Displacement Meter Provers For Liquid Hydrocarbons
Author: Charles R. Groves
Source: 1978 International School of Hydrocarbon Measurement
Year Published: 1978
Abstract: Today, with the increasing need for energy, the decreasing supply, and the resulting higher costs involved, the need for accurate measurements of liquid hydrocarbons is of vital importance to the oil industry. Two major types of liquid meters are generally accepted by the industry for measurement of crude and refined product. These are turbine and positive displacement type meters. When new, they are generally manufactured to provide an accuracy of 0.05 percent (1/2 of 1%) by volume throughout a given flow range. However, meters have a tendency to wear, causing a drag on the moving parts, or permitting slippage of liquid through the measuring unit and as a result, liquid meters are constantly being checked in the field, in their own environment by a meter prover to determine this degree of shift in accuracy. Once the metered volume has been compared to a known certified volume (the meter prover) a meter factor can be applied to the registered output of the meter to correct for this shift in accuracy.

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