ASME MFC-18M pdf download MEASUREMENT OF FLUID FLOW USING VARIABLE AREA METERS 1 scOPE This Standard describes the common variable areaflowmeter. This Standard does not attempt to standardizedimensions because the commercial products differ toowidely. The variable area meter is manufactured in a varictyof designs.This Standard addresses only those metersbased on a vertical tapered tube of round or a modifiedround cross...