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Title: Uncertainty Analysis Of A Large Scale Calibration Facility
Author: Thomas Kegel
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: In March of 1999 CEESI completed construction of a natural gas calibration facility located in Clear Lake, Iowa. The facility is designed for the calibration of large (up to 30?, 760 mm) high pressure (1200 psi, 830 bar) natural gas meters. The facility has three test sections, 20? (508 mm), 24? (610 mm), and 30? (760 mm) in diameter. The flow to a test section is measured with an array of ten 12? (472 mm) turbine meters. A broad range of flowrates can be achieved by flowing simultaneously through multiple meters. Efforts are underway to expand upon the uncertainty analysis performed when the facility was built, this paper discusses a number of issues associated with that effort. The discussion begins with a review of the initial calibration of the flow standards. The discussion continues with three programs designed to maintain traceability and reduce uncertainty. The first is statistical process control based on ultrasonic meter check standards. A new program, turbine swap testing, is described and preliminary results are presented. The third involves applying statistical process control techniques to pressure and temperature measurement. The discussion concludes by proposing a unique approach to propagating uncertainty components.

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