19-3_TW-2010.pdf

AN AMERICAN NATIO NAL STANDARDThermowellsASME PTC 19.3 TW-2010Performance Test CodesCopyright 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cINTENTIONALLY LEFT BLANKCopyright 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.c标准分享网 w w w.b z f x w.c o m 免费下载ASME PTC 19.3 TW-2010ThermowellsPerformance Test CodesA N A M E R I C A N N A T I O N A L S T A N D A R DThree Park Avenue New York,NY 10016 USACopyright 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cDate of Issuance:July 12,2010This Code will be revised when the Society approves the issuance of a new edition.There will be no addenda issued to PTC 19.3 TW-2010.ASME issues written replies to inquiries concerning interpretations of technical aspects of this document.Periodically certain actions of the ASME PTC Committee may be published as Code Cases.Code Cases and interpretations are published on the ASME Web site under the Committee Pages at http:/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 National Standards.The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input 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 any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent,nor assumes any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME 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 2010 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.c标准分享网 w w w.b z f x w.c o m 免费下载w w w.b z f x w.c o miiiCONTENTSForeword .vAcknowledgments.vCommittee Roster.viCorrespondence With the PTC Committee .viiSection 1 Object and Scope .11-1 Object .11-2 Scope .1Section 2 Nomenclature .2Section 3 Jurisdiction of Codes .43-1 Reference Standards and Governing Codes .43-2 Specification of Thermowells .4Section 4 Dimensions .54-1 Configurations .54-2 Dimensional Limits .5Section 5 Materials .105-1 General Considerations .10Section 6 Stress Equations .116-1 General Considerations .116-2 Corrosion and Erosion .116-3 Flow-Induced Thermowell Stresses .126-4 Strouhal Number,Drag Coefficients,and Lift Coefficient .136-5 Natural Frequency of Thermowells .146-6 Mounting Compliance Factor .156-7 Unsupported Length,Diameter,and Fillet Radius .166-8 Frequency Limit .186-9 Magnification Factor .216-10 Bending Stresses .216-11 Pressure and Shear Stresses .246-12 Steady-State Static and Dynamic Stress Limits .246-13 Pressure Limit .27Section 7 Overview of Calculations .287-1 Quantitative Criteria .287-2 Fluid Properties .287-3 Fluid Velocity .287-4 Material Properties and Dimensions .287-5 Reynolds and Strouhal Numbers .297-6 Natural Frequency at Operation Temperature .297-7 Natural Frequency at Expected Mode of Operation .297-8 Steady-State and Dynamic Stresses .297-9 Allowable Fatigue Limits .297-10 Pressure Rating .29Section 8 Examples .308-1 Tapered,Welded Thermowell for a Steam-Header Application(U.S.Customary Units).308-2 Step-Shank,Threaded Thermowell for a Hot Water Application(SI Units).33Copyright 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cw w w.b z f x w.c o mivSection 9 Statement of Compliance .399-1 Specifica