ASME_MFC-14M-2003.pdf

AN AMERICAN NATIONAL STANDARDASME MFC-14M2003(Revision of ASME MFC-14M2001)AN AMERICAN NATIONAL STANDARDASME MFC-14M2003(Revision of ASME MFC-14M2001)MEASUREMENT 0FFLUID FLOW USINGSMALL BOREPRECISIONORIFICE METERSMEASUREMENT 0FFLUID FLOW USINGSMALL BOREPRECISIONORIFICE METERSCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.ANAMERICANNATIONALSTANDARDMEASUREMENTOFFLUIDFLOWUSINGSMALLBOREPRECISIONORIFICEMETERSASMEMFC-14M2003(RevisionofASMEMFC-14M2001)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:April 17,2003This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda issued to this edition.ASME will issue written replies to inquiries concerning interpretations of technical aspects of thisStandard.Interpretations are published on the ASME Web site under the Committee Pages at http:/www.asme.org/codes/as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2003 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the MFC Committee.vi1Scope and Field of Application.12References and Related Documents.13Symbols and Definitions.14Principle of Measurement and Method of Computation.75General Measurement Requirements.96Installation Requirements.97Discharge Coefficient and Empirical Equations.148Uncertainties.169Pressure Loss,?(h).17Figures1Standard Orifice Plate.112Corner Tap Geometry.133Location for Orifice Flange Pressure Taps.144Honed Small Bore Orifice Flow Section With Corner Taps.15Tables1Symbols.22Minimum Recommended Upstream Straight Length Required to Achieve anUncertainty of 0.75%.10iiiCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDBefore the publication of this Standard,there was no standard covering the measurementsof fluid flows using small bore precision orifice meters(nominal line sizes of14in.through 112in.)using differential pressure devices.Most people have used ASME fluid meters for guidanceor obtained information from the manufacturers of proprietary devices.This Standard has been prepared by the ASME Committee on Measurement of Fluid Flows inClosed Conduit(MFC).Suggestions for improvement of this Standard should be sent to:Secretary,MFC,The AmericanSociety of Mechanical Engineers,Three Park Avenue,New York,NY 10016.This Standard was approved as an American National Standard on February 26,2003.ivCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further