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Title: Uncertainty Analysis Of The Low Flow Capability Of A Natural Gas Calibration Facility
Author: Thomas Kegel
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: The low flowrate capability of the CEESIowa Natural Gas Calibration facility is based on a series of flowmeter standards installed in a custom designed pipe system. The flow standards consist of three ultrasonic and one coriolis meter. The pipe and valve system design includes meter redundancy that facilitates monitoring the long term consistency of calibration services. The traceability of the flow standards is established using a three step process. It begins with the calibration of a set of four critical flow venturies (CFVs) in direct comparison with a primary flow standard. The four CFVs then serve as transfer standards to calibrate a second set of six CFVs. The six CFVs are then used as transfer standards to calibrate the ultrasonic meter flow standards. This paper details the uncertainty analyses of both the initial calibration and ongoing monitoring of the calibration process. Uncertainty components include calibration processes, gas properties, and the measurements of pressure and temperature. The analysis includes a unique application of statistical techniques to localize the sources of observed random effects

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