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Title: Measurement Of Natural Gas At Low Temperatures Using Displacement Type & Turbine Meters
Author: Michael A. Howard
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Meters are typically proof-tested by their manufacturers in climate controlled conditions where both the ambient and gas temperature approximate 21C (70F). In some parts of North America, ambient temperatures can be as low as -40C (-40F) and gas temperatures, if not heated, can be as low as -29 C (-20F). How does this affect gas measurement accuracy and how can meters be proved at these operating conditions? In the past. Northern Natural Gas Company had always heated our natural gas prior to measurement in an effort to maintain the gas temperature in a range of 0 to 5C. heaters useo tor this purpose consumed from .1 to .25% of the total gas sold through these meters. In an effort to reduce operating expenses, we began evaluating the impact of eliminating heater operation. This led to extensive field testing by our measurement technicians which produced an alarming indication that the meters were slowing down from 2-5% when operated at low gas temperatures.

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