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Title: An Intercomparison Of Water Flow And Gas Flow Laboratories Using ISO 5167 DP Devices
Author: Jos Van Der Grinten Roy Van Hartingsveldt Stefan Knfel Eberhard Gralla Johann Kolar
Source: Flomeko 2016
Year Published: 2016
Abstract: This paper describes an intercomparison that has been organized b etween August 2013 and March 2014 , using a ISA 1932 nozzle, a long radius nozzle and a Ventu ri tube , which were made in stainless steel for the purpose of the project. The device s were calibrated on water, hot water and natural gas by 7 laboratories. The calibration results obtained with water, hot water and natural g a s connect well in the overlappin g range of Reynolds numbers. For the ISA 1932 nozzle and the long radius nozzle the results of all laboratories agree with at least 95% confidence. The results of the Venturi tube shows significant differences between laboratories at a number of calibratio n points. The discharge coefficients C d observed at the A and B tappings generally agree within 0.1%, with the least differences for the ISA nozzle and the hig h est for the Venturi tube. One of the remarkable outcomes was the low scatter of C d for water calibrations of the long radius nozzle and the close agreement to the literature value .

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