1.1 This test method is for both online and laboratory instrument based determination of liquefied natural gas (LNG), liquid petroleum gas and propane (LPG) and natural gas liquids (NGL) composition, energy content and indices using Raman spectroscopy. The components commonly determined according to this test method are CH4, C2H6, C3H8, i-C4H10, n-C4H10, iC5H12, n-C5H12, neo-C5H12, C6H12, C6H14, N2, O2, CO2, H2, and H2S. The applicable range of this standard is 200 ppmv to 100 percent hydrocarbons (C1-C6).
The molecular composition of liquefied natural gas (LNG) is important for custody transfer and production. It is used to calculate the heating value of LNG and it is important to ensure regulatory compliance.
Keywordscalorific heating value, Wobbe index, relative abundance, specific gravity
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as D7940-2014 and Pending Publication