Flow-X─ Function Reference
4-193
Flow-X General functions - fxGPA_TP15
fxGPA_TP15
Description
The GPA-TP15 standard defines a generalized correlation method to determine the vapor pressure (i.e.
the equilibrium pressure) for natural gas liquids (NGL).
The vapor pressure is required by the API 11.2.2 and API 11.1:2004 calculations of the CPL value for
light hydrocarbon liquids that have a vapor pressure above atmospheric pressure.
References
API MPMS 11.2.2 Addendum - Compressibility Factors for Hydrocarbons: Correlation Factors
of Vapor Pressure for Commercial Natural Gas Liquids - First Edition, December 1994
GPA Technical Publication TP-15 A Simplified Vapor Pressure Correlation for Commercial
NGLs - 1988
API MPMS 11.2.5 - A Simplified Vapor Pressure Correlation for Commercial NGLs -
September 2007
GPA Technical Publication TP-15 A Simplified Vapor Pressure Correlation for Commercial
NGLs - September 2007
ASTM Technical Publication [Stock No. PETROLTBL-TP15] - September, 2007
Note: the first two and the last three refer to one and the same standard. The
current standard GPA-TP15 (2007) / API MPMS 11.2.5 extends the applicable range
of the previous standard GPA TP-15 (1988) / API MPMS 11.2.2 Addendum 1994
while preserving the calculations and constants of the previous standard.
Boundaries
The GPA TP-15:1988 / API MPMS 11.2.2 Addendum:1994 correlation method is valid for the following
range.
0.490 to 0.676 (RD60)
-50 to 140 °F
The GPA TP-15:2007 / API MPMS 11.2.5:2007 correlation method has been extended for lower density
and is valid for the following ranges.
Lower range:
0.350 to 0.425 (RD60)
-50 to (695.51*RD60 - 155.51) °F
with RD60 being the relative density at 60°F
Higher range:
0.425 to 0.676 (relative density)
-50 to 140 °F
Summary of Contents for flow-x
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