Cameron Scanner 3100 EFM - Table 1.6-Flow Correction Factors

Table 1.5—Fluid Property and Energy Flow Calculations
Standard Description Natural Gas Hydrocarbon Liquid Steam
GPA 2145
(2008)
GPA 2145 is a compilation of numerical values for the parafn hydrocarbons and
other compounds occurring in natural gas and natural gas liquids as well as for a few
other compounds of interest to the industry. GPA 2145 supports an intermediate cal-
culation and therefore is not a standard uid property selection in the Scanner 3100
web interface.
♦
ISO 6976
(1995)
ISO 6976 species methods for the calculation of the superior caloric value and the
inferior caloric value, density, relative density and Wobbe index of dry natural gas
and other combustible gaseous fuels, when the composition of the gas by mole frac-
tion is known. A simplied version of the AGA 5 calculation, ISO 6976 supports an
intermediate calculation and therefore is not a standard uid property selection in the
Scanner 3100 web interface.
♦
IAPWS-IF97,
Saturated
Steam
IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and
Steam. This calculation should be used when the steam is assumed to be at the
saturation temperature at a given owing pressure. Only a pressure input is required.
Providing a steam quality measurement will yield an estimated liquid owrate and
produce accumulations for vapor and liquid water.
♦
IAPWS-IF97,
All Regions
IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and
Steam. This calculation should be used when measuring in regions off the saturation
line operating conditions and when the water is liquid or super-heated. A pressure
input and a temperature input are required. From the owing condition inputs, the
operating region of the water is detected: liquid water (Region 1), dry steam (Region
2), critical range (Region 3), and saturated steam (Region 4). All regions except liquid
water are accumulated as vapor.
♦
Flow Correction Factors
The Scanner 3100 measures compensated petroleum liquid ow using an orice or cone ow meter. For accuracy, these
measurements often include a correction factor to compensate for the effect of gas or water on volume, or changes in
calibration. Table 1.6 describes the correction factors congurable in the Scanner 3100 web interface.
Table 1.6—Flow Correction Factors
Flow Correction Factor Description
Multipoint Meter Factor
Correction (for Gas and
Liquid)
The multipoint meter factor calibration method allows users to compensate for
variations between calibrations without changing the meter K-factor from the value
stamped on the meter at the factory. Meter factors are typically determined through
calibrations performed by third-party test laboratories. You can enter the appropriate
factor during calibration to account for any variation in the calibration curve over
Reynolds numbers.
Chisholm-Steven Orice
Meter Multiphase
Correction (for Steam)
The Chisholm-Steven correction method is used for over-reading prediction in wet
vapor ow conditions (multiphase) for water at the owing conditions along the
saturation line. When provided with a quality measurement, the vapor ow is corrected
and the estimated liquid ow is accumulated.
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Scanner 3100 EFM Section 1