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V-17 Temperature Correction of Provers

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Date: 1996-01-01
Bulletin: V-17-E
Category: Volume

1.    The purpose of this bulletin is to confirm that effective October 1, 1994, Measurement Canada will correct the volume of provers to the reference temperature of 15ºC when conducting meter inspections.

2.    It has long been the normal practice to compensate for the temperature of the prover when testing meters with a pipe prover. This is a sound metrological practice since the prover is calibrated in terms of 15ºC and its physical properties are known.

3.    The effect of temperature is significant when the prover is constructed of stainless steel, which has a cubical expansion of about one and a half times that of mild steel. In addition, the further the prover temperature is from 15ºC, the greater the correction required.

4.    The American Petroleum Institute (API), one of the leading international bodies in the meter proving field, deems temperature correction as essential. While it is a good idea to understand the process for determining the correction, it is not imperative. The attached table will provide the inspector or technician with all of the data required to perform the correction.

5.    In order to assist industry during the transition period, Measurement Canada inspectors will record on the calibration certificates, or any other relevant documentation, that the prover was corrected for temperature. The temperature at the time of the inspection will also be noted.

6.    For additional information, please contact:

Ted Kingsbury
Senior Program Officer, Volume Measurement
Measurement Canada