_PTC_25_Edtn_2008.pdf

Pressure Relief DevicesAN AMERICAN NATIO NAL STANDARDASME PTC 25-2008(Revision of ASME PTC 25-2001)Performance Test CodesCopyright 2008 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted 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.ASME PTC 25-2008(Revision of ASME PTC 25-2001)Pressure ReliefDevicesPerformance Test CodesAN AMERICAN NATIONAL STANDARDCopyright 2008 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted 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:January 13,2009This Code will be revised when the Society approves the issuance of a new edition.There will be noaddenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code.Periodically certain actions of the ASME PTC 25 Committee may be published as Cases.Cases andinterpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org 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 assumes 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 2009 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2008 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted 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.CONTENTSNotice.viForeword.viiCommittee Roster.viiiCorrespondence With the PTC 25 Committee.ixIntroduction.xPart IGeneral.1Section 1Object and Scope.11-1Object.11-2Scope.11-3Measurement Uncertainty.11-4General.1Section 2Definitions and Description of Terms.32-1Purpose.32-2General.32-3Types of Devices.32-4Parts of Pressure Relief Devices.42-5Dimensional Characteristics Pressure Relief Valves.52-6Dimensional Characteristics Nonreclosing Pressure Relief Devices.72-7Operational Characteristics of Pressure Relief Devices.72-8Description of Terms.8Part IIFlow Capacity Testing.11Section 3Guiding Principles.113-1Items on Which Agreement Shall Be Reached.113-2Qualification of Person Supervising the Test.113-3Responsibility of Person Supervising the Test.113-4Test Apparatus.113-5Preliminary Tests.113-6Spare Instruments.113-7Calibration of Instruments.113-8Metering Sections.123-9Flow Resistance Test Rigs.123-10Adjustments During Tests.143-11Records and Test Results.143-12Measurement Uncertainty.14Section 4Instruments and Methods of Measurements.154-1General.154-2Fluid Conditions,Test Conditions,and Instrumentation.154-3Testing With Steam,Pressure Relief Device Discharging to AtmosphericPressure.184-4Testing With Gas or Air,Pressure Relief Device Discharging to AtmosphericPressure.234-5Testing With Liquids,Pressure Relief Devices Dischargin