ISO 23874:2006 pdf download – Natural gas — Gas chromatographic requirements for hydrocarbon dewpoint calculation. 8.2.3.1 Boiling-point comparison The n-alkanes are easily distinguished in the separation and their properties are well known. They are, therefore, used as the basis for checking boiling point data. From an existing and comprehensive analysis, calculate the C 7 to C 12 fraction quantities, where measurable, according to 9.3.1. Identify these fractions as the equivalent n-alkanes and calculate the dewpoint on this basis. Now rename the C 7 group as the fraction, FR7, rather than n-C 7 , and give it a boiling point and...