ASTM D1945 Analysis of Natural Gas by Gas Chromatography

Scope: 

ASTM D1945 analysis provides a standardized method for analyzing the chemical composition of natural gas using gas chromatography. The test method provides information about the levels of individual hydrocarbons, such as methane, ethane, propane, butane, and pentane, as well as other components, such as carbon dioxide and nitrogen.

Test Procedure: 

The ASTM D1945 test method employs a gas chromatograph with a narrow tube called a column. The sample mixture, vaporized and mixed with an inert gas, flows continuously through the column. As the sample mixture components interact with the column lining or filling, also called the stationary phase, their passage rates through the column differ according to their chemical and physical properties. The column is typically enclosed in an oven that maintains a constant temperature. The exiting chemicals are electronically detected and identified.

Specimen Size: 

The standard does not specifically mention the specimen size used in ASTM D1945 to analyze natural gas by gas chromatography.

The amount of gas required for analysis will depend on the analytical instrument and specific testing requirements. The standard recommends that the gas volume used in the study be sufficient to achieve the required precision and accuracy of the test results.

Read more: ASTM D7213 Boiling Range Distribution of Petroleum Distillates by Gas Chromatography

Data: 

The chemical composition of natural gasses and other gaseous mixtures is reported. 

Conclusion:

The ASTM D1945 test method is an important tool for ensuring the quality and performance of natural gas. By using this test method, producers and distributors of natural gas can determine the gas’s composition and ensure that it meets the required specifications for its intended use. The test results can also be used to optimize the performance of natural gas equipment, such as burners and boilers, and to develop strategies for controlling emissions.