Appendix A
Procedure for Calculating Volume Correction Factors (VCF)
1. Obtain a copy of the temperature versus density data for the desired product (API tables or
other source).
2. Determine the reference temperature (usually 60 degrees F for petroleum products).
3. Calculate the VCF values for the product at the desired operating temperatures using the fol-
lowing equation:
VCF = Density at given temp / Density at reference temp
4. Create a table of VCF values versus temperature covering the normal operating temperatures of
the desired product.
5. Program the VCF versus temperature data into the Level Plus monitor. Enter the values into the
table by increasing temperatures. For this example, the VCF table would start with 40°F and
VCF = 1.03099, and end with 80°F and VCF = 0.96718
Example:
TEMP (degrees F) Density (lb / cu ft) VCF
40 32.7340 1.03099
50 32.2491 1.01572
60 31.7500 1.00000
70 31.2351 0.98378
80 30.7080 0.96718
NOTE
The VCF table entries are limited to temperature val-
ues between 0 and 300 degrees Fahrenheit and VCF
values between 0.80000 and 1.20000.
89
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