ASTM D 7940 : 2014
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Standard Practice for Analysis of Liquefied Natural Gas (LNG) by Fiber-Coupled Raman Spectroscopy
Hardcopy , PDF
01-04-2022
English
07-16-2014
Important note : All end users must be registered with an Account prior to user licenses being assigned.CONTAINED IN VOL. 05.06, 2014 Defines both on-line and laboratory instrument-based determination of composition for liquefied natural gas (LNG) using Raman spectroscopy.
| Committee |
D 03
|
| DocumentType |
Standard Practice
|
| Pages |
9
|
| PublisherName |
American Society for Testing and Materials
|
| Status |
Superseded
|
| SupersededBy |
1.1This standard practice is for both on-line and laboratory instrument-based determination of composition for liquefied natural gas (LNG) using Raman spectroscopy. The basic methodology can also be applied to other light hydrocarbon mixtures in either liquid or gaseous states, if the needs of the application are met, although the rest of this practice refers specifically to liquids. 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, neo-C5H12, N2, O2. The applicable range of this standard is 200 ppmv to 100 mol %. 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, inerts can be calculated indirectly by subtracting the sum of the other species from 100 %.
1.2The 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 and health practices and determine the applicability of regulatory limitations prior to use.
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| ASTM E 691 : 2019 : EDT 1 | Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method |
| ASTM D 4150 : 2019 | Standard Terminology Relating to Gaseous Fuels |
| ASTM D 7833 : 2014 | Standard Test Method for Determination of Hydrocarbons and Non-Hydrocarbon Gases in Gaseous Mixtures by Gas Chromatography |
| ASTM E 691 : 2009 | Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method |
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| ASTM D 4150 : 2000 | Standard Terminology Relating to Gaseous Fuels |
| ASTM D 3588 : 1998 : R2003 | Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels |
| ASTM D 1946 : 1977 | Standard Method for Analysis Of Reformed Gas By Gas Chromatography |
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| ASTM D 3588 : 1998 : R2011 | Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels |
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| ASTM D 1945 : 2003 | Standard Test Method for Analysis of Natural Gas by Gas Chromatography |
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| ASTM D 4150 : 2003 | Standard Terminology Relating to Gaseous Fuels |
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| ASTM D 4150 : 2021 | Standard Terminology Relating to Gaseous Fuels |
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| ASTM D 1945 : 2014 | Standard Test Method for Analysis of Natural Gas by Gas Chromatography |
| ASTM D 4150 : 2021 : REV B | Standard Terminology Relating to Gaseous Fuels |
| ASTM D 7833 : 2020 | Standard Test Method for Determination of Hydrocarbons and Non-Hydrocarbon Gases in Gaseous Mixtures by Gas Chromatography |
| ISO 6974-5:2014 | Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons |
| ASTM D 1946 : 1990 : R2011 | Standard Practice for Analysis of Reformed Gas by Gas Chromatography |
| ASTM D 1945 : 2014 : REDLINE | Standard Test Method for Analysis of Natural Gas by Gas Chromatography |
| ASTM D 1945 : 1991 | Standard Test Method for Analysis of Natural Gas by Gas Chromatography |
| ASTM D 7833 : 2012 | Standard Test Method for Determination of Hydrocarbons and Non-Hydrocarbon Gases in Gaseous Mixtures by Gas Chromatography |
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