ProSoft Technology PTQ-AFC - Manual (Page 223)

PTQ-AFC ♦ Modicon Quantum Platform Reference
Liquid and Gas Flow Computer for Hydrocarbon Products User Manual
ProSoft Technology, Inc. Page 223 of 259
June 23, 2011
SI units:
D
 610 kg/m3 Table 54A (Crude&NGL) or 54B (Refined Products)
500
 D < 610 (LPG) ASTM-IP-API Petroleum Measurement Tables for Light
Hydrocarbon Liquids 500-653 kg/m3 1986 ISBN 0 471 90961 0
US units:
D
 0.610 RD60 Table 24A (Crude&NGL) or 24B (Refined Products),
0.350
 D < 0.610 (LPG) Table 24E - TP25
The low density range of 0.350 RD60 in US units is considerably lower than the
500 kg/m3 in SI units, because the E Tables are available only for US units.
Correction of density from flowing temperature to standard temperature is a
converging iteration which includes the calculation of the VCF (Volume
Correction Factor). Standards applied are those listed above except that Tables
n3x are used instead of Tables n4x.
An option is available to iteratively correct the density calculation for elevated
flowing pressure according to the condition given in bold type in MPMS Ch12.2
1995 Part 1 Appendix B Section B.1 (page 21).
Compressibility Factor F
(According to MPMS Ch 11.2 (US) or11.2M (SI) 1986)

Vapor pressure correlation according to GPA TP-15 June 1988.
 Pressure Correction Factor (CPL) is calculated from F and pressure above
equilibrium according to MPMS ch12.2 1995, where "atmospheric pressure"
is read as "base pressure" and "gage pressure" is read as "pressure above
base". The module considers:
Pressure process input + barometric pressure = absolute pressure