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Inter-laboratory Comparison Publications
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North American Inter-Laboratory Flow Measurement Testing Program  Download PDF
Steve Caldwell, Jan Bosio, Edgar Bowles Jr, and Umesh Karnik,
10/28/1996, 14th Annual North Sea Flow Measurement Workshop
Abstract:
An inter-laboratory flow measurement testing program has been established for the purpose of benchmarking individual North American facilities relative to each other and to other flow facilities in Europe. The North American laboratories involved are Colorado Engineering Experiment Station, Inc. (CEESI) in Nunn, Colorado, USA; the Gas Research Institute (GRI) Metering Research Facility (MRF) at Southwest Research Institute (SwRI) in San Antonio, Texas, USA; and the NOVA Gas Dynamic Test Facility near Calgary, Alberta, Canada. Also, the Karsto Metering & Technology Laboratory (K-Lab) in Haugesund, Norway, is directly participating in some of the North American round robin testing.
The initial inter-laboratory comparison tests involve two critical flow venturi nozzles: a NOVA nozzle (with a throat diameter of 10 mm) and a K-Lab nozzle (with a throat diameter of 23.3 mm). Tests have been conducted for a variety of compressible fluids using primary and secondary methods of flow reference. Results from both nozzles indicate that, at a comparable Reynolds number, the facilities agree to within ±0.2%. Results also suggest that the uncertainty in C* may be negligible. Future North American inter-laboratory comparison plans include testing of the Groupe Europeen de Recherches Gazieres (GERG) G-650 tandem turbine meter transfer standard package and the EUROMET critical flow nozzle. The NOVA nozzle is also to be tested at Ruhrgas in Germany and at the Korean Research Institute of Standards and Science (KRISS) in Korea.
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