Cameron Scanner 3100 EFM - Table 1.5-Fluid Property and Energy Flow Calculations

Table 1.5—Fluid Property and Energy Flow Calculations
Standard Description Natural Gas Hydrocarbon Liquid Steam
AGA 5 (2009) AGA 5 provides the methods for computing the mass, molar, and volumetric heating
values of natural gas at reference temperature. AGA 5 is also used in calculating re-
lated properties, including Wobbe index, motor octane number, and net (inferior) vol-
ume heating value. AGA 5 supports an intermediate calculation and therefore is not a
standard uid property selection in the Scanner 3100 web interface.
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AGA 8, Part 1,
Detailed (2017)
The worldwide standard for calculating the physical properties of natural gas and
similar gases is the AGA 8 92DC equation originally described in AGA Report No. 8
(1992). The 2017 edition, Part 1, uses the same DETAIL equations of state as in the
1994 edition of AGA 8. However, the temperature, pressure, and gas composition
limits have been modied in this edition.
Use of this calculation requires a gas analysis, i.e. knowledge of the mole fractions of
21 gas components: the alkanes methane through decane, common diluents includ-
ing nitrogen, carbon dioxide, hydrogen sulde, and assorted trace components. In
ISO 12213-2 (1997), the AGA 8 92DC equation was adopted without modication.
The AGA 8 92DC equation is most accurate between temperatures of 17 degF and
143 degF (–8 degC to 62 degC) and at pressures up to 1,750 psia (12 MPa). If lesser
accuracy is acceptable, the range can be extended from –200 degF to 400 degF
(–130 degC to 200 degC) and pressures up to 20,000 psi (140 MPa). This uid calcu-
lation will provide the computed value for Speed of Sound.
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AGA 8, Part 1,
Gross (2017);
SGerg-88
(1988)
When the detailed composition of the gas is unknown, an alternative method of charac-
terizing the gas is available. It is based on the gross properties: real gas relative density
(gas gravity), and content of carbon dioxide and nitrogen. This method detailed in AGA
8 and ISO 12213-3 is based on the SGerg-88 equation. The Gross Characterization
method should only be used at temperatures between 17 degF and 143 degF (–8
degC to 62 degC) and at pressures below 1,750 psia (12 MPa). Gravity range is from
0.554 to 0.87; up to 28.94% carbon dioxide, and up to 53.6% nitrogen. This method
should not be used outside of these limits.
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AGA 8, Part 2,
Gross (2017);
Gerg-2008
(2012)
AGA 8, Part II uses temperature, pressure, and gas molar composition to compute
uid density at base and owing conditions. AGA 8, Part II is used with a ow calcula-
tion to determine uid ow rate.
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API MPMS
Chapter 11.1
(2004)
The temperature and pressure correction factors for hydrocarbon liquids including
crude oil, rened products (gasoline, jet fuel, fuel oils), lubricating oils, and special
products are calculated according to API MPMS Chapter 11.1 (2004). For crude oils,
the density range is 610.6 to 1,163.5 kg/m3, temperature range is from –58 degF to
302 degF (–50 degC to 150 degC), and pressure range is from 0 to 1,500 psig (0 to
10,340 kPa). For differential pressure meters, the viscosity at operating temperature
is a required input to the ow computer, and it must be determined as accurately as
possible.
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API MPMS
Chapter 20.1
(2011)
API MPMS Chapter 20.1, Section 1.9.5.4, provides procedure for computing net oil
volume in an oil/water mixture when watercut is higher than normal and a dynamic
sampling method, such as an online watercut analyzer, is used to measure watercut,
incorporating a shrinkage factor where applicable.
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Section 1 Scanner 3100 EFM