We receive error message /QTYW/BCG032 “Sum of mole fractions is not unity to the nearest 0.000 1, variance is 0.001”, why is that?
Issue:
You attempt to perform a quantity conversion for natural gas where the molar composition of the natural gas needs be entered. This composition needs to be complete and the sum of all mole fractions needs to be 1 +/- 0.000 1, as specified in the relevant natural gas measurement standards. This is not the case.
System Response:
The system stops processing.
QuantityWare BCG implementations for natural gas, LNG or NLG/LPG, where the chemical composition is entered for porperty calculations, require that the chemical composition data is normalized such that the sum of all fractions is within 1 +/- 0.000 1 mole.
- Chemical composition data must be provided normalized for the calculation of all relevant physical properties of your LNG, natural gas or NGL/LPG product within that range .
- Normalization is typically done in the laboratory, where the gas chromatographic analysis is made. Normalization is defined e.g. in ISO 6974, which allows – in the historic version from 1984 – non-normalized raw data in a range of 99 mole % to 101 mole % to be normalized to 100 mole %. The current version is defining different state-of-the-art data analysis and normalization procedures
- QuantityWare considers normalization to be a mandatory part of the laboratory result reports. Thus, BCG and BCP do not contain any ABAP MQCI functions that can be used to receive non-normalized laboratory data and perform quantity conversion and property calculations for a conversion group.
- If normalization is not part of the chemical analysis report from your laboratories, you may define, develop and deploy your own customer specific Z* ABAP MQCI normalization function at your own specification and risk, with support from a certified QuantityWare BCG consultant and plug that function into your MQCI ABAP function module sequence.
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