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Title: Thermometry In Gas Measurement
Author: Stephen T. Stark
Source: 2009 International School of Hydrocarbon Measurement
Year Published: 2009
Abstract: The measurement of gas temperature is not easy. In fact, gas temperature is one of the more difficult variables to measure correctly. Temperature plays an important role in gas flow calculations where ultrasonic meters, orifice meters, turbine meters, diaphragm meters, displacement-type meters, and many other meter types are used.1,2,4 Measured several times between the wellhead and its final point of consumption, natural gas temperature is ever changing. When gas molecules are packed tightly together, such as when flowing through a gas compressor, they heat up. When gas expands after flowing through a regulator or other restriction, it cools down. Natural gas temperature is also affected by the temperature of the pipe through which it flows. The measurement of gas temperature contributes directly to overall measurement accuracy. The greater the temperature measurement error, the higher the overall measurement uncertainty becomes. Even relatively small temperature measurement errors can have a large impact on the bottom line.

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