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Section 4: Maintenance Operating and maintenance instructions
January 2015 3-9008-701 Rev J
7. Test Measure Scale Reading: Actual measurement recorded from the calibrated section
of the test measure. This is a + or — reading from the zero mark.
4.3.2 Calculations
The following formula will be used in the process of calculating the Compact Prover base
volume at reference conditions:
1. Vtp: The corrected prover volume at reference conditions.
2. Vm: The stated volume of the test measure, plus or minus the scale reading recorded
on the data sheet from the water draw.
3. Tmp: Volumetric correction factor for differences between the prover and the test
measure temperatures as found in American Petroleum Institute (API) Chapter
11.2.3(m) Water Certification of Volumetric Provers.
4. Css: This is the correction factor for the temperature of the stainless steel test measure,
the carbon (or stainless steel) flow tube, and the Invar rods. The correction factor is
determined using the following formula:
Where:
Tm is the temperature of the test measure recorded from the water draw procedure using the
temperature thief.
Tb is the reference temperature.
Etm is the cubical coefficient of expansion of the stainless steel test measure depending on
temperature units being used: 0.0000265/ F or 0.0000477/ C.The manufacturer of the test
measure will also give this value that may be used if desired for improved accuracy.
Tp is the temperature of the prover. This is the average of T1 and T2.
Eft is the squared coefficient of expansion used for the flow tube. This number will vary
depending on the material of the flow tube.