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The sensitivity of orifice plate metering to poor conditioned flow and swirling flow are subjects of concerns to flow meter users and manufacturers. The distortions caused by pipefittings and pipe installations upstream of the orifice plate are major sources of poorly conditioned and swirling flow. These distortions will alter the accuracy of metering by an unacceptable degree up to 7% error in standard discharge coefficient. So the design of orifice plate meters that are independent of thedoi:10.1108/02602280510577861 fatcat:afczhsa7kvhi3ortw2f3wizx5i