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The calculations have been carried out using the validated executable programme GERG FOR described in Annex B. Table C. Considerable care is needed to ensure that correctly referenced inputs are used for calorific value and relative density. Several countries normally use the above conditions, but olners use alternative conditions.
For those using non-metric units for calorific value 2. Btu , conversion both of units and of reference conditions is required. NOTE2 —11is the combustion reference temperature. NOTES isthe gos-metering reference tempereture.
A selection of appropriate conversion factors is given in Table 0. However, because the relevant reference conditions are elways thermodynamically close together, and because natural gases do not vary in their composition to any major extent, it is possible in practice to givo conversion factors which may be applied to any typical natural gas with essentially no loss of accuracy in the converted physical properties.
Table D. Column 2 of Table E. The range of natural gas mole fractions with values of compression factor supported by experiment is smaller than the range of pipeline quality natural gas, and also smaller than the wider ranges of application. Table E. For these natural gases, the maximum limit for the mole fraction of carbon dioxide is given as 0, This means, in effect, that the ratio of successive mole fractions in the alkane homologous series is typically This rule of thumb has been substantiated and consolidated "9] through a comparison with the GERG databank The dashed lines in Figures E.
The absolute tolerance limits selected here define the data situation much better than relative tolerance limits! For one such example a North Sea gas, designated , containing 0, 2 mole fraction ethane, 0, Measurements with a gas density measurement system!
The total measurement uncertainty is composed in equal parts of the uncertainty in the density measurement and the measurement uncertainty in the analysis of the natural-gas sample examined. Within these limits, the uncertainties aro as given in 4.
In Figures F. This is for informative purposes only and is not intended to imply a recommendation that the equation be used routinely or uncritically above the normal specified limits.
The uncertainty limits are dependent upon pressure, temperature and composition, and are also strongly affected by the proximity of the phase boundary. Dashed lines are used to separate two regions of estimated uncertainty when the experimental evidence is not sufficient to determine the position of the boundary.
The detailed composition of the gas will have a strong influence on the position of the phase boundary and the user should, therefore, make his own phase boundary calculation. Schouten August 16, Values for the gas constant, molar masses, calorific values and the density of air conform with ISO IF TC. GT, 0. I X3 LT.
The calculations have been carried out using the validated executable programme GERG FOR described in Annex B. Table C. Considerable care is needed to ensure that correctly referenced inputs are used for calorific value and relative density. Several countries normally use the above conditions, but olners use alternative conditions. For those using non-metric units for calorific value 2. Btu , conversion both of units and of reference conditions is required.
ISO 12213-3 PDF
Calculation of compression factor. Take the smart route to manage medical device compliance. Worldwide Standards We can source any standard from anywhere in the world. If you need help with the purchase or have any queries please email enquiries standards.
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