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Title: Effect Of Low Flow And Extreme Ambient Conditions On Thermowell Performance
Author: Robert Mcbrien And John Geerligs
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: An investigation was done to determine if external heating of meter run piping, caused by surrounding ambient air temperatures well above pipeline gas temperature, might lead to measureable errors in temperature measurement (needed for mass flow calculations) using the current AGA Report No. 9 recommended thermowell insertion depths of 0.1 to 0.33 of the pipe internal diameter. It was determined that errors can occur, the magnitude of which will depend on the amount of pipe wall heating, gas flow rate and temperature, and the design of the thermocouples. Detailed description and discussion of the tests and results are presented in this paper

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