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Petroleum gases and other gaseous hydrocarbons. (HS code(s): 2711); Fuels (ICS code(s): 75.160), Gaseous Mixtures

DUS 2524:2022, Standard Test Method for Determination of Hydrocarbons and Non-Hydrocarbon Gases in Gaseous Mixtures by Gas Chromatography, First Edition

This Draft Uganda Standard is intended to quantitatively determine the non-condensed hydrocarbon gases with carbon numbers from C1 to C5+ and non-hydrocarbon gases, such as H2, CO2, O2, N2, and CO, in gaseous samples. This test method is a companion standard test method to Test Method ASTM D1945 and Practice ASTM D1946, differing in that it incorporates use of capillary columns instead of packed columns and allows other technological differences.

Hydrogen sulfide can be detected but may not be accurately determined by this procedure due to loss in sample containers or sample lines and possible reactions unless special precautions are taken.

Non-hydrocarbon gases have a lower detection limit in the concentration range of 0.03 to 100 mole percent using a thermal conductivity detector (TCD), and C1 to C6 hydrocarbons have a lower detection limit in the range of 0.005 to 100 mole percent using a flame ionization detector (FID); using a TCD may increase the lower detection limit to approximately 0.03 mole percent.

Hydrocarbon detection limits can be reduced with the use of pre-concentration techniques or cryogenic trapping, or both. 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. Water vapor may interfere with the C6+ analysis if a TCD detector is used. Helium and argon may interfere with the determination of hydrogen and oxygen respectively. Depending on the analyzer used, pentenes, if present, may either be separated or grouped with the C6+ components.

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