ASTM D 4891:2013

1.1 This test method covers the determination of the heating value of natural gases and similar gaseous mixtures within the range of composition shown in Table 1 , and Table 2 that covers flare components but is not intended to limit the components to be measured in flare gases. TABLE 1 Natural Gas Components and Range of Composition Covered Compound Concentration Range, mole, % Helium 0.01 to 5 Nitrogen 0.01 to 20 Carbon dioxide 0.01 to 10 Methane 50 to 100 Ethane 0.01 to 20 Propane 0.01 to 20 n -butane 0.01 to 10 isobutane 0.01 to 10 n -pentane 0.01 to 2 Isopentane 0.01 to 2 Hexanes and heavier 0.01 to 2 TABLE 2 Natural Gas Components and Range of Composition Covered A Compound CAS Number Volatile Analytes Acetone 67-64-1 Acetonitrile 75-05-8 Acrolein 107-05-8 Acrylonitrile 107-13-1 Benzene 71-43-2 2 1,3-Butadiene 106-99-0 Carbon disulfide 75-15-0 Chlorobenzene 108-90-7 Cumene (isopropylbenzene) 98-82-8 1,2-Dibromoethane 106-93-4 Ethylbenzene 100-41-4 2,2,4 Hexane 110-54-3 Methanol 67-56-1 Methyl isobutyl ketone 108-10-1 Methyl t-butyl ether 1634-04-4 Methylene chloride 75-09-2 Nitrobenzene 98-95-3 Nitropropane 79-46-9 Pentane2 109-66-0 Styrene 100-42-5 Tetrachloroethene 127-18-4 Toluene 108-88-3 Trichloroethene 79-01-6 Trimethylpentane 2 540-84-1 Xylenes (mixed isomers) 1330-20-7 Trimethylpentane 2 540-84-1 Xylenes (mixed isomers) 1330-20-7 Semi-volatile Analytes Acenaphthene 83-32-9 Acenaphthylene 208-96-8 Aniline 62-53-3 Anthracene 120-12-7 Benzidine1 92-87-5 Benz[a]anthracene 56-55-3 Benzo[b]fluoranthene 205-99-2 Benzo[k]fluoranthene 207-08-9 Benzo[g,h,i]perylene 191-24-2 Benzo[a]pyrene ...

75.060, 75.160.30