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Title: Long-Term Variations In The Base Volume Of Pipe Provers
Author: A. T. J. Hayward, P. A. m. Jelffs
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Numerous pipe provers have been recalibrated by colleagues of the authors over the past twenty years, using the master meter/master prover method. Data are presented from groups of provers in three different countries, using different calibration equipment. The principal conclusions drawn are: (1) Control charts, showing how the base volume of a prover varies over a period of years, are valuable and should always be kept. (2) The claimed absolute accuracy of 0.05 per cent of the base volume is justified. (3) A major source of inaccuracy is the errors arising from variations in the calibrated volume of primary standard measures, which propagates downwards through the traceability chain. (4) Despite a widely-held belief to the contrary, the round-trip base volume of a bidirectional prover is almost as liable to change when detectors are replaced as the base volume of a unidirectional prover. (5) The initial calibration of a prover at the manufacturers plant is liable to change during transport and installation, and should therefore be repeated on site as early as possible.

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