Flow Control, Flow Control April 2019
Quiz Corner What is the proper tap location for an orifi ce plate fl owmeter A 1 inch upstream and 1 inch downstream of the orifice plate B 0 diameters upstream and 0 diameters downstream of the orifice plate C 1 diameter upstream and 05 diameter downstream of the orifice plate D 8 diameters upstream and 25 diameters downstream of the orifice plate A ny of these tap locations could be correct depending upon the application and its design The mechanical location of flange taps Answer A and corner taps Answer B is typically maintained by purchasing special flanges that are predrilled to accurately locate these taps relative to the orifice plate Radius taps Answer C and full flow taps Answer D are typically located in the pipe itself Vena contracta taps not included as an answer are located 1 diameter upstream and at the vena contracta determined by orifice geometry downstream Additional complicating factors Selection between flange corner taps and pipe taps is typically related to cost and or the ability to accurately locate pipe taps in small lines Selection between flange taps and corner taps is largely determined by personal and or geographic preference FC www fl owcontrolnetwork com April 2019 9 xijian iStock
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