4-100
Flow-X─ Function Reference
Flow-X General functions - fxAPI_MPMS_11_2_1
fxAPI_MPMS_11_2_1
The API MPMS 11.2.1 standard consists of a printed table that contains compressibility factors to
correct hydrocarbon volumes under pressure to the corresponding volumes at the equilibrium pressure
for the metered temperature.
The table contains compressibility factors related to meter temperature and API gravity at 60°F.
From the compressibility factor the volume correction for pressure is calculated according to API MPMS
12.2.
Compliance
API MPMS 11.2.1 - Compressibility Factors for Hydrocarbons: 0 - 90°API Gravity Range - First
Edition, August 1984
API MPMS 12.2 - Calculation of Liquid Petroleum Quantities Measured by Turbine or
Displacement Meters
Boundaries
API MPMS 11.2.1 defines the following limits on the input values:
0 to 90 °API
-20 to +200 °F
0 to 1500 psig.
API Rounding
The actual standard is the printed table. It also includes the 'Calculation Procedure' to obtain the table
values based on the rounding and truncating of all input, intermediate and output values.
The function provides the option to either output the table value (including the full API rounding and
truncating requirements) or to perform the calculation procedure without any rounding and truncating
being applied.
Name
Remark
EU
SW tag
Range
Default
Name
Optional tag name, tag description
and tag group
API60
API gravity at 60°F
°API
0..120
0
Observed
Temperature
°F
-50..400
60
Observed Pressure
psig
-10..2000
0
Equilibrium
Pressure
The equilibrium pressure is
considered to be 0 psig for liquids
which have an equilibrium
pressure less than atmospheric
pressure (in compliance with API
MPMS 12.2 par. 12.2.5.4)
psig
EQUIPRES
0..2000
0
API 11.2.1
rounding
0: Disabled
The calculation of the
compressibility factor F is
performed with full precision.
1: Enabled
API-MPMS 11.2.1 rounding
and truncating rules are
applied. The compressibility
factor F is rounded to 3
decimal places as specified in
the standard.
APIROUND
-
0
Содержание flow-x
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