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ASME PTC 19.3 Thermowells , 2010
- CONTENTS
- FOREWORD
- ACKNOWLEDGMENTS
- COMMITTEE ROSTER
- CORRESPONDENCE WITH THE PTC COMMITTEE
- Section 1 Object and Scope [Go to Page]
- 1- 1 OBJECT
- 1- 2 SCOPE
- Section 2 Nomenclature
- Section 3 Jurisdiction of Codes [Go to Page]
- 3- 1 REFERENCE STANDARDS AND GOVERNING CODES
- 3- 2 SPECIFICATION OF THERMOWELLS
- Section 4 Dimensions [Go to Page]
- 4- 1 CONFIGURATIONS
- 4- 2 DIMENSIONAL LIMITS
- Section 5 Materials [Go to Page]
- 5- 1 GENERAL CONSIDERATIONS
- Section 6 Stress Equations [Go to Page]
- 6- 1 GENERAL CONSIDERATIONS
- 6- 2 CORROSION AND EROSION
- 6- 3 FLOW- INDUCED THERMOWELL STRESSES
- 6- 4 STROUHAL NUMBER, DRAG COEFFICIENTS, AND LIFT COEFFICIENT
- 6- 5 NATURAL FREQUENCY OF THERMOWELLS
- Table 6- 5.3- 1 Parameters for Natural Frequency Calculation for Step- Shank Thermowells
- 6- 6 MOUNTING COMPLIANCE FACTOR
- 6- 7 UNSUPPORTED LENGTH, DIAMETER, AND FILLET RADIUS
- 6- 8 FREQUENCY LIMIT
- 6- 8.3 Frequency Limit for the General Case
- 6- 8.5 Passing Through the In- Line Critical
- 6- 9 MAGNIFICATION FACTOR
- 6- 10 BENDING STRESSES
- 6- 11 PRESSURE AND SHEAR STRESSES
- 6- 12 STEADY- STATE STATIC AND DYNAMIC STRESS LIMITS
- 6- 13 PRESSURE LIMIT
- Section 7 Overview of Calculations [Go to Page]
- 7- 1 QUANTITATIVE CRITERIA
- 7- 2 FLUID PROPERTIES
- 7- 3 FLUID VELOCITY
- 7- 4 MATERIAL PROPERTIES AND DIMENSIONS
- 7- 5 REYNOLDS AND STROUHAL NUMBERS
- 7- 6 NATURAL FREQUENCY AT OPERATION TEMPERATURE
- 7- 7 NATURAL FREQUENCY AT EXPECTED MODE OF OPERATION
- 7- 8 STEADY- STATE AND DYNAMIC STRESSES
- 7- 9 ALLOWABLE FATIGUE LIMITS
- 7- 10 PRESSURE RATING
- Section 8 Examples [Go to Page]
- 8- 1 TAPERED, WELDED THERMOWELL FOR A STEAM- HEADER APPLICATION ( U. S. CUSTOMARY UNITS)
- 8- 2 STEP- SHANK, THREADED THERMOWELL FOR A HOT WATER APPLICATION ( SI UNITS)
- Section 9 Statement of Compliance [Go to Page]
- 9- 1 SPECIFICATION OF A THERMOWELL
- 9- 2 VELOCITY AND PRESSURE RATINGS
- Section 10 References [Go to Page]
- 10- 1 REFERENCED DOCUMENTS
- 10- 2 REFERENCED ASME DOCUMENTS
- FIGURES [Go to Page]
- Fig. 4-1-1 Schematic Diagram of a Thermow
- Fig. 4-1-2 Examples of Straight-Shank Thermowells
- Fig. 4-1-3 Examples of Step-Shank Thermowells
- Fig. 4-1-4 Examples of Tapered Thermowells
- Fig. 6-3.1-1 Fluid-Induced Forces and Assignment of Axesfor Calculation of Thermowell Stresses
- Fig. 6-6-1 Unsupported Length of Thermowells
- Fig. 6-8.1-1 Schematic Indicating Excitation of Resonances When ExcitationFrequency Coincides With the Thermowell Natural Frequency
- Fig. 6-8.1-2 Schematic Showing the Amplitude Response of a Thermowell Subjected toFluid-Induced Forces as Solid Lines, for In-Line and Transverse Excitation Modes
- Fig. 6-10.1-1 Bending Moment, Stress at the Support Plane,and Locations of Maximum Steady-State or Oscillating In-Line Stress
- Fig. 6-10.7-1 Mounting of a Thermowell in an Elbow,With the Tip Facing Downstream
- Fig. 6-10.7-2 Geometry to Be Used in Calculation ofThermowell Ratings
- Fig. 6-10.7-3 Mounting of a Thermowell in an Elbow,With the Tip Facing Upstream
- TABLES [Go to Page]
- Table 4-1-1 Dimensional Limits for Straight and Tapered Thermowells Within the Scope of This Standard
- Table 4-2-1 Dimensional Limits for Step-Shank Thermowells Within the Scope of This Standard
- Table 6-5.3-1 Parameters for Natural FrequencyCalculation for Step-Shank Thermowells
- Table 6-12.3-1 Allowable Fatigue-Stress Amplitude Limits for Material Class A and Class B
- NONMANDATORY APPENDIX A CONVERSION FACTORS [Go to Page]