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Title: Performance Evaluation Of Critical Flow Venturi Nozzle With Primary Standard Calibration Facilities At Fcri And Validation With ISO Standards
Author: Unnikrishnan.P.N(*), Sivaprakash.K.G(**),Cmde Rtd() S. Saseendran
Source: Flomeko 2010
Year Published: 2010
Abstract: A 2 NB Critical Flow Venturi Nozzle (CFVN) of Nominal Flow capacity 25m3/h was designed at Fluid Control Research Institute (FCRI), India as a transfer standard for undertaking calibration of smaller capacity flow meters. The Nozzle fabricated was of Toroidal throat design and was assembled as per the general guidelines of ISO 9300:2005 Measurement of gas flow by means of Critical flow Venturi nozzles. The Air Flow Measurement facilities at FCRI is equipped with Primary Standards Pressure-Volume-Temperature-time (PVTt) facility of 2m3 Nominal volume and 90 m/h maximum flow capacity and a Bell Prover of 500 ltr volume and with a maximum flow capacity of 40m/h.

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