API MPMS 12.2:1981 pdf download

API MPMS 12.2:1981 pdf download.Manual of Petroleum Measurement Standards Chapter 12- Calculation of Petroleum Quantities Section 2- -Calculation of Liquid Petroleum Quantities Measured by Turbine or Displacement Meters.
12.2.6.3 RULE FOR ROUNDING—PROVERS
in calcnlating a prover volume, determine individual correction factors to six decimal places by using the appro. priate formuk interpobrion will be required for C. Record the combined correction factor (CCF) roun to six decimal places. Multiply the sum of the measired volumes, each of which has n individually adjusted to starting tjr afire, by the CCF, and repoit the base volume so determined to five significant digits. Round the corrected individuai withdrawal volumes to the same number of significant digits as the unconected volumes.
12.2.6.4 CALCULATION OF BASE VOLUMES
The procedure for calibrating p provers will be found in Chapter 4. Section 2. The following subsections, 12.2.6.4.1 through 12.2.6.4.4. specify the calcul2non of the base volume of a pipe prover calibrated by the water draw method.
12.2.6.4.1 Initial Step
During the calibration of a pipe prover, the temperature and pressure of the water in the prover at the srt of calibration e observed and recorded. Likewise, the tem perarures of the individual withdrawals into field uandmds are observed and recorded.
NOTE: At s point mit is din to a km etlishd practe de2*d in API Sd 1101. Pppbs 2123 to 2125. that coriection for need be applied
12.2.6.42 Corrections Applied to Measured
Volumes
In the water draw calibration procedure, the volume observed in the field standards must be subjected to certain corrections in order to determine the base volume of the prover (see Equation B I. Appendix B). The final subscripts mean “p” for prover and “M” for measure.
Thus, the following steps are performed:
1. The volume of water in a field standard must be corrected for the effect of temperature and pressure on the liquid to determine what volume the water occupied when it was in the prover this is done by niu1tiplyig d volume by C the value for which can be found in Chapter 11.4.2, and dividing by C. the value of which can be computed from Equation 10 using F for water.
2. The volume so det iizd must then be corrected for theral expansion of the field standard shell at d treasuring tetnperaiire by multiplying the certified volume by C (see Equation 3).
3. Finally, the measured volume of the prover so calculated must be corrected for both wmperatuie and pressure effects on the prover pipe in order to obtain the base volume, which is the equivalent volume at standard conditions. These cor ‘jojjs require dividing by C,1, and C1,, respectively. In calculating the values of C11 and C,, the physical characteristics of the prover metal must be known. Because an accuracy eater than 1 part in 10,000 is desirable in prover base volumes, determine all correction factor values to six decii!ial places. In practice, when several test sures are filled, the calculation is performed according to Equation B6 in Appendix B in d n2rnr specified in the following example (12.2.6.4.3).
12.2.6A.3 Example Calculation for a Pipe Prover.