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Title: Liquid Flow Provers (CONVEfTIONAL)
Author: Carroll Teschendorf
Source: 1986 International School of Hydrocarbon Measurement
Year Published: 1986
Abstract: Liquid measurement devices such as turtoine and positive displacement meters have been Imown to be able to repeat outsut for given flow conditions very well. However, the linearity of these devices are subject to basic meter characteristics on any fluid, shifts in output due to changes in specific gravity, velocity profile (due to viscosity changes, wear of parts, accumulation of paraffin on internals that may change hydraulic area throu meter), terrperature cihanges (causing expansion or contraction of housing and/or internals) and various other effects. Therefore, if we can calibrate the meter at the condition it operates (flow rate and fluid condition) with a field standard, we can in essence elimnate most inaccuracies involved in measurement and resolve any doubts about the meter accuracy. This calibration is performed in most applications by conventional displacement provers placed in-line, since this prover is virtually unaffected by any of the above fluid characteristics having excellent repeatability, better than 0.02% (3 standard deviations) over a wide range of flow rates and fluid conditions.

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