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Title: Construction Of A Re-Circulation Type High-Pressure Air Flow Measurement Facility And Uncertainty Evaluation
Author: Jiunn-Haur Shaw, Fong-Ruey Yang, Yi-Lin Ho
Source: 2006 International Symposium on Fluid Flow Measurement
Year Published: 2006
Abstract: Increasing conscience on environmental protection has prompted the use of cleaner energy, such as natural gas in stead of fuel oil or coal, for electric power generation. Taiwan has over 15 years history in importing natural gas from Indonesia and distributing it for household gas burner as well as two major electrical power plants. The sizes of the gas flow measurement device range from small diaphragm gas meters to large capacity, 600-750mm orifices or ultrasound meters. To promote fair trade and safeguard Taiwans legal metrology infrastructure in gas flow measurement, the National Measurement Institute constructed a gravimetric type air-flow calibration system with sonic nozzle array as the working standard in mid-90s. The flow measurement capacity at 1 bar and 23 ? is from 15 m3/h to 20000 m3/h with operating pressure range from 1 bar to 60 bar. Apparently, the flow capacity does not meet the calibration need from large capacity flow meters. Due to such limitation at NMI, and to disseminate measurement traceability to Taiwan Power Company for custody transfer, a larger flow calibration station was constructed at Chinese Petroleum Corp in southern part of Taiwan. The pressure range is also from 1 bar to 60 bars with flow range from 20 m3/h to 4000 m3/h under actual pressure. Based on a re-circulating principle and flow driven by three sets of Howden high pressure blower, the facility set up the traceability with NMI through two sets of 100mm Instromet Rotary Piston Prover(IRPP). Various sets of turbine meters ranging from 100 mm to 200 mm are used in parallel as working standards and to cascade up the flow rate to 4000 m3/h. The largest meter size to be calibrated is 300 mm at present and 400 mm is expected. The calibration system consists of three flow loops with the expanded uncertainties at 95% confidence level at 0.24%, 0.34% and 0.42% respectively. This paper describes the design features, operation equipments, control logic and instrumentation, and uncertainty evaluation of this flow facility. An international proficiency testing with Korea Gas Company is planned for year 2006, and optical based flow measurement technology is under development with assistance from CMS.

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