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Ask The Experts"Ask The Experts" is moderated on ControlGlobal.com by noted process control authority and CONTROL Columnist Bela Liptak. Liptak either answers the questions himself, or brings in one or more experts from his cadre of co-authors that worked with him on the Instrument Engineers' Handbook, Fourth Edition. Save yourself the hefty consulting fees by getting the answers to your questions here.

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Orifice flowmeter rangeability

Today’s transmitters promise high turndowns, but other factors affect accuracy.

Mar 27, 2017

*Q*: I am measuring crude oil components (water, oil, gas) in a three-phase test separator of capacity 3,000 barrels per day (BBD). I designed the orifice plates for the oil and water to be of 1,500 BBD range. However, on actual testing, the oil per well was found to be a maximum of 500 BBD, leading to inaccurate flow measurement. One solution was to use multiple orifices to be swapped before testing each well, knowing approximately the capacity of the well in BBD and taking into consideration the orifice rangeability. Or to use multiple transmitters.

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