Inter-comparisons of water flow calibration facilities have been frequently performed to assess the performances of flow measurement laboratories. As required for Key Comparisons (KCs), quantification of flow measurement uncertainties of flow calibration facilities at the level of 0.1 percent or better, however, will undoubtedly require test procedures capable of generating measurement data having higher levels of metrological quality than achieved earlier. As well, these procedures will need to generate data sets that are statistically sufficient so that high confidence can be placed in the results from the data analyses. The aim of the KC is to determine the degree of equivalence of water flow standards by comparing them not only as realized, but also through the normal, routine calibration procedures used in the labs. To do this, a high precision transfer standard, a thorough test procedure for the selected test conditions, and a statistical data analysis method appropriate for the data sets are necessary. This paper presents a part of the initial efforts KRISS, as the Initiating Lab, has made to implement the KC for water flow, CCM.FF-K1, see: www.bipm.org. This KC is currently in progress. The test plan which generates statistically sufficient numbers of data points will be presented with pilot comparison results produced by the Initiating Lab and the two Assisting Laboratories.
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