IS 1448 : Part 197 : 2025 Petroleum and Its Products - Methods of Test - Part 197 Determination of Hydrocarbons and Non-Hydrocarbon Gases in Refinery Gas Streams by Gas Chromatography
1 SCOPE
1.1 This standard prescribes the method of test for determination of quantitative composition of refinery gas streams containing non-condensed hydrocarbon gases with carbon numbers from C1 to C5+ and non-hydrocarbon gases such as H2, CO2, O2, N2 and CO using a preconfigured multicolumn gas chromatograph. Vaporized liquefied petroleum gas (LPG) is determined for its composition, C6+ hydrocarbons are reported as a composite.
1.2 Hydrogen sulphide can be detected with less accuracy due to the loss in sample containers and sample injection tubing, Sulphur inert sample containers and sample injection system is required to estimate hydrogen sulphide accurately.
1.3 Non-hydrocarbon gases are estimated in the range 0.03 mole percent to 100 mole percent using thermal conductivity detector (TCD) and hydrocarbon gases are estimated in the range 0.005 mole percent to 100 mole percent using flame ionization detector (FID).
1.4 This test method is not used to determine individual hydrocarbons greater than C5, heavier hydrocarbons are reported as C6+.
1.5 Helium and Argon in the mixture will interfere with the estimation of hydrogen and oxygen respectively.
1.6 Water vapour will interfere with C6+ analysis when thermal conductivity detector (TCD) is used.