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PS 2860-6-2025

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Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons using three capillary columns
Committee: Petroleum Products, Fuels, and Lubricants
Sector: Chemicals and Petroleum
Available Standards
Original Standard
إنجليزي (English) 29 Page 2025
Price: 76 NIS Available for Purchase
International Classification for Standards (ICS)
Code Classification
75.060 Natural gas
Adopted Standards
Standards / Amendment / Corrigendum
1 ISO 6974-6:2002
2 Cor 1:2003
Replacement Sequence
Replaces
PS 2862-2012
Scope
This part of ISO 6974 describes a gas chromatographic method for the quantitative determination of the content of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons in natural gas samples using three capillary columns. It is applicable to the analysis of gases containing constituents within the mole fraction ranges given in Table 1 and is commonly used for laboratory applications. 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 present at detectable levels, 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.
This method can also be applicable to the analysis of natural gas substitutes.

NOTE Additional information on the applicability of this method to the determination of natural gas substitutes is also given where relevant.

Table 1 — Application ranges
ComponentFormulaMole fraction
%

NOTE The analysis may be extended under specific conditions (e.g. greater sample volume) to hydrocarbons heavier than C8, if present in mole fractions > 1 µmol/mol.

a These components are generally not present in natural gas, but in natural gas substitute.
b The separation of propane from propene is critical. Depending on the column in use this separation may not be achieved.
c Components included: n-heptane, 2-methylhexane, 3-methylhexane, 3-ethylpentane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 2,2,3-trimethylbutane. Not all isomers can be separated from each other.
d Components included: n-octane, 2-methylheptane, 3-methylheptane, 4-methylheptane, dimethylcyclohexanes, 2,2-dimethylhexane, 2,3-dimethylhexane, 2,4-dimethylhexane, 2,5-dimethylhexane, 3,3-dimethylhexane, 3,4-dimethylhexane, 2,2,3-trimethylpentane, 2,2,4-trimethylpentane (i-octane), 2,3,3-trimethylpentane, 2,3,4-trimethylpentane, 2,2,3,3-tetramethylbutane. Not all isomers can be separated from each other.
e Components included: o-xylene, m-xylene, p-xylene. m- and p-xylene will not be separated from each other.
HeliumHe0,002to0,5
HydrogenH20,001to0,5
OxygenO20,007to5
NitrogenN20,007to40
MethaneCH440to100
Carbon monoxide aCO0,001to1
Carbon dioxideCO20,001to10
Ethyne (Acetylene) aC2H20,001to0,5
Ethene aC2H40,001to0,5
EthaneC2H60,002to15
Propene a bC3H60,001to0,5
Propane bC3H80,001to5
i-ButaneC4H100,000 1to1
n-ButaneC4H100,000 1to1
2,2-Dimethylpropane (Neopentane)C5H120,000 1to0,5
2-Methylbutane (i-Pentane)C5H120,000 1to0,5
n-PentaneC5H120,000 1to0,5
CyclopentaneC5H100,000 1to0,5
2,2-DimethylbutaneC6H140,000 1to0,5
2,3-DimethylbutaneC6H140,000 1to0,5
2-MethylpentaneC6H140,000 1to0,5
3-MethylpentaneC6H140,000 1to0,5
n-HexaneC6H140,000 1to0,5
BenzeneC6H60,000 1to0,5
CyclohexaneC6H120,000 1to0,5
HeptanescC7H160,000 1to0,5
MethylcyclohexaneC7H140,000 1to0,5
TolueneC7H80,000 1to0,5
OctanesdC8H180,000 1to0,5
XyleneseC8H100,000 1to0,5