Norm

NEN-EN-ISO 6974-2:2010 Ontw. en

Aardgas - Bepaling van de samenstelling en de daarmee samenhangende onzekerheid door gaschromatografie - Deel 2: Berekeningen van de onzekerheid

  • Deze norm is ingetrokken sinds 06-06-2012

31,83

Over deze norm

Status Ingetrokken
Aantal pagina's 32
Commissie Aardgas
Gepubliceerd op 01-05-2010
Taal Engels
This Part of this Standard gives describes the process required to determine the uncertainty associated with the mole fraction for each component from a natural gas analysis performed using Part 1 of this Standard. This approach is suitable for a range of end applications, for example calibration of gas mixtures or to provide natural gas composition and uncertainty data to be used in the calculation of calorific value and other additive physical properties of the gas. Details of these end applications are provided in Part 3 and subsequent Parts of ISO 6974. Compliance with this Standard for the purpose of reporting mole fractions and associated uncertainties requires the use of this Part with a Part 1 and a method of analysis that meets the requirements of, and is operated in accordance with this Part. This could be either one of Part 3 or subsequent Parts of this Standard, or another chromatographic method of choice. Any chromatographic method not forming Part of this Standard shall be documented in the same manner and to the same detail as used to specify the methods in Part 3 and subsequent Parts of this Standard. Section 5.5 of Part 1 of this Standard describes the ‘conventional normalisation’ approach for calculating processed mole fractions from raw (unprocessed) mole fractions. When conventional normalisation is used for multiple operation without bridging methods, the uncertainties in the calculated mole fractions will be conservative. If a more accurate assessment of uncertainty is required, an alternative approach for normalisation using generalised least squares may be used - this is described in Annex B.

Details

ICS-code 75.060
Nederlandse titel Aardgas - Bepaling van de samenstelling en de daarmee samenhangende onzekerheid door gaschromatografie - Deel 2: Berekeningen van de onzekerheid
Engelse titel Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations
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