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  • ISO
    ISO 6974-4:2000 Natural gas -- Determination of composition with defined uncertainty by gas chromatography -- Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns
    Edition: 2000
    $192.38
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Content Description

This part of ISO 6974 describes a gas chromatographic method for the quantitative determination of natural gas constituents using a two-column system. This method is applicable to determinations made in on-line processes or in the laboratory. It is applicable to the analysis of gases containing constituents within the mole fraction ranges given in Table 1. These ranges do not represent the limits of detection, but the limits within which the stated precision of the method applies. Although one or more components in a sample may not be detected present, the method can still be applicable.

This part of ISO 6974 is only applicable if used in conjunction with parts 1 and 2 of ISO 6974.

Table 1 - Application ranges
ComponentMole fraction range %
Nitrogen0,001 to 15,0
Carbon dioxide0,001 to 10
Methane75 to 100
Ethane0,001 to 10,0
Propane0,001 to 3,0
iso-Butane (2-methylpropane)0,001 to 1,0
n-Butane0,001 to 1,0
neo-Pentane (2,2-dimethylpropane)0,001 to 0,5
iso-Pentane (2-methylbutane)0,001 to 0,5
n-Pentane0,001 to 0,5
Hexanes + sum of all C6 and higher hydrocarbons0,001 to 0,2


About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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