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Title: Uncertainty Issues Associated With A Very Large Capacity Flow Calibration Facility
Author: T. m. Kegel
Source: 2000 Measurement Science Conference
Year Published: 2000
Abstract: In the spring of 1999, CEESI began operation of a natural gas calibration facility located in Iowa with a maximum flow capability in excess of 2000 pounds per second. The flow standard is a parallel array of ten turbine meters. The traceability to NIST is achieved through the CEESI Colorado facility. This paper discusses aspects of the flow measurement traceability methodology and associated uncertainty analysis. The complete uncertainty analysis comprises many components. These include the measurements of pressure, temperature, and gas composition as well as flowrate. The data acquisition system and calculations of compressibility and flowrate also contribute uncertainty. This paper concerns only those components of uncertainty contributed by the flow measurement. The paper is divided into four sections. The first two sections briefly describe the flowmeter types and initial calibration process. The last two sections describe two measurement assurance programs that are underway.

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