| 摘要 |
A method and apparatus for determining a volume correction ratio for a gas (12) by measuring the temperature and pressure of sample gas (20) tapped from a pipeline (14) as it undergoes controlled expansion. Sample (20) gas flows through first chamber (22) and mechanical pressure regulator (24), where the pressure of the sample gas (20) is reduced. The pressure decay rate of sample gas (20) is measured in the second chamber (26) and compared to a reference gas (31) pressure decay rate. The volume correction ratio is determined from the rate of change of pressure in the first chamber (22), the absolute pressure of the pipeline gas (12), and the absolute temperature of the pipeline gas (12). The volume correction ratio is used to determine the flowing condition density Pf from a measured base condition density Pb.
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