ASTM D 7940 : 2021
Current
The latest, up-to-date edition.
Standard Practice for Analysis of Liquefied Natural Gas (LNG) by Fiber-Coupled Raman Spectroscopy
Hardcopy , PDF
English
25-11-2021
Committee |
D 03
|
DocumentType |
Standard Practice
|
Pages |
11
|
PublisherName |
American Society for Testing and Materials
|
Status |
Current
|
Supersedes |
1.1This practice is for both on-line and laboratory instrument-based determination of composition for liquefied natural gas (LNG) using Raman spectroscopy. Although the procedures in this practice refer specifically to liquids, the basic methodology can also be applied to other light hydrocarbon mixtures in either liquid or gaseous states, provided the data quality objectives and measurement needs are met. From the composition, gas properties such as heating value and the Wobbe index may be calculated. The components commonly determined according to this test method are CH4, C2H6, C3H8, i-C4H10, n-C4H10, iC5H12, n-C5H12. Components heavier than C5 are not measured as part of this practice.
Note 1:Raman spectroscopy does not directly quantify the component percentages of noble gases; however, inert substances can be calculated indirectly by subtracting the sum of the other species from 100 %.
1.2Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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ASTM D 1945 : 2014 : R2019 | Standard Test Method for Analysis of Natural Gas by Gas Chromatography |
ASTM D 1946 : 1990 : R2019 | Standard Practice for Analysis of Reformed Gas by Gas Chromatography |
ASTM D 3588 : 1998 : R2024 : EDT 1 | Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels |
ASTM D 4150 : 2021 : REV B | Standard Terminology Relating to Gaseous Fuels |
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