Understand how the meter correction factor is calculated
- Last UpdatedApr 24, 2025
- 2 minute read
The API implementation of double-walled and small volume provers works for all proving method selections. In general, the selection of APIch21, Kenonic, or Original will determine the discrimination levels and the computation of combined correction factors.
|
Item |
API21 |
Kenonic |
|---|---|---|
|
Count repeatability |
Run counts must be within the minimum and maximum count % |
Run counts must be within the min & max count % |
|
Density readings |
Round to xxxx.x kg/m3 |
Un-rounded |
|
Temperature readings |
Round to xx.x5 C |
Un-rounded |
|
Pressure readings |
Round to xx.0 kPa |
Un-rounded |
|
Dimensions (pipe diameter, wall thickness, base prover volume) |
AB.XXXXX, A.XXXXX, 0.XXXXXX, 0.0XXXXXX |
Un-rounded |
|
Base density |
Round 1 decimal place |
Round to previous API implementation |
|
Run average temperature |
Round to xx.x5 C |
Un-rounded |
|
Run average pressure |
Round to xx.0 kPa |
Un-rounded |
|
CPLp, CPLm Correction Factor for Pressure On Liquid for Prover (CPLp) Correction Factor for Pressure on Liquid for Meter (CPLm) |
Compressibility (ºF) 9 places, CPL values to 5 places |
Round to previous API implementation (typically 4 decimals) |
|
CTLp, CTLm Correction Factor for Temperature on Liquid for Prover (CTLp) Correction Factor for Temperature on Liquid for Meter (CTLm) |
Round to 5 places |
Round to previous API implementation |
|
CPSp Correction factor for Pressure on Steel for Prover |
Round to 5 places |
Round to previous API implementation (typically 4 decimals) |
|
CTSp Correction factor for Temperature on Steel for Meter |
Round to 5 places |
Round to previous API implementation (typically 4 decimals) |
|
CCFM Combined Correction Factors for Meter |
CTLm * CPLm, round to 5 places |
ctlm [4 places] * cplm[4 places], round 4 places |
|
GSVp Gross Standard Volume for Prover. |
AB.XXXXX, A.XXXXX, 0.XXXXXX, 0.0XXXXXX |
Rounded to 5 places |
|
IVm Indicated Volume for Meter |
AB.XXXXX, A.XXXXX, 0.XXXXXX, 0.0XXXXXX |
Rounded to 5 places |
|
ISVm Indicated Standard Volume for Meter |
AB.XXXXX, A.XXXXX, 0.XXXXXX, 0.0XXXXXX |
Rounded to 5 places |
|
mcf |
Rounded to 4 places |
Rounded to 4 places |