1. Scope
1.1 The test method determines quantitatively the noncondensed hydrocarbon gases with carbon numbers ranging from C1-C5+ and nonhydrocarbon gases, such as H2, CO2, O2, N2, and CO, in gaseous samples. 1.2 Hydrogen sulfide can be detected but may not be accurately determined by this procedure because of loss in sample containers or sample lines and possible reactions unless special precautions are taken. 1.3 The nonhydrocarbon gases are determined in the concentration range of 0.03 to 100 volume percent using a TCD detector and the C1 to C6 hydrocarbons are determined in the range of 0.0050 to 100 volume percent if an FID detector is used; using a TCD detector may limit lower quantification to approximately 300-ppm range. 1.4 This test method does not fully determine individual hydrocarbons heavier than benzene, which are grouped together as C7+ When detailed analysis is not required, the compounds with carbon number greater than C5 may be grouped as either C6+, or C7+. Accurate analysis of C5+ components depends on proper vaporization of these compounds during sampling at process unit sources as well as in the sample introduction into the analyzer in the laboratory. 1.5 Water vapor may interfere with the C6+ analysis if a TCD detector is used. 1.6 Helium may interfere with the hydrogen determination and argon with oxygen. Depending on the analyzer used, pentenes, if present, may either be separated or grouped with the C6+ components. 1.7 The values stated in SI units are to be regarded as the standard. 1.8 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulator limitations prior to use.
Keywords
gas chromatography; gas sampling valve; hydrocarbons; nonhydrocarbon gases; gas analysis
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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