1、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 Mechanica
2、l 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 Soc
3、iety 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
4、 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.A
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11、yright 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 miiiCONTENTSF
12、oreword .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 Dimensio
13、ns .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 N
14、atural 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 Pressur
15、e 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 Opera
16、tion .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
