© 2019 Department of Petroleum Resources. All rights reserved Department of Petroleum Resources (DPR) PROCEDURE GUIDE

Page 56 of 114

55 | P a g e

2.5.4 Presentation of Results
2.5.4.1 The result of the calibration shall be presented in a standard form and will contain
the following information:
a)
Prover serial number, type, dimensions and the proving location.
b)
Field Standard (test measure) – Nominal capacity identification and
certifications.
c)
Observed values – pressure, temperature, density and volumes.
d)
Corrections for temperature, pressures, Prover materials and proving liquid.
e)
Base Prover Volume calculation.

2.5.4.2 Results of calibration by master meter method shall be in the standard form giving
information on the Prover, master meter and how its meter factor was established
on site and the Base Prover volume calculation.
2.5.4.3 For Prover calibration using a Master meter, the master meter calibration flow rate
shall agree with the flow rate at which the Prover is to be calibrated.
2.5.4.4 The calibration result shall be endorsed by representative of Department of
Petroleum Resources and approved by the Director of Petroleum Resources if found
satisfactory and this shall constitute approval for the continued use of the Prover
concerned.
2.5.4.5 Input or change of Base Prover Volume and other parameters shall ONLY be in the
presence of an officer of the Department of Petroleum Resources.
2.5.4.6 For conduct of linearity test after a prover loop certification exercise, a newly
generated BPV shall be used and immediately replaced with the old approved BPV
pending the approval of the new BPV by the Department.

2.6 Meter Proving Operations
2.6.1 Definition
This is the procedure used to determine the relationship between the true volume of a liquid
measured by a meter and the volume indicated by the meter. This relationship is generally
called the meter factor which is expressed as the ratio of the actual volume of a liquid
passed through the meter to the volume registered by the meter.
2.6.2 General Consideration
2.6.2.1 Meters shall be proved as close to their normal operational conditions as possible.
2.6.2.2 Meters shall be proved with liquid to be metered, or if not practicable such as the
case of in-factory tests, with a liquid whose density and viscosity are very close to
those of the liquid to be measured.
2.6.2.3 Five consecutive proving runs must check to 0.020% repeatability, else the meter shall
be taken out for inspection and repair before being put back into service.