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ASME PTC 19.3 TW - 2016: Thermowells, 2016
- CONTENTS
- FOREWORD
- ASME PTC 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 [Go to Page]
- 6-1.1 Overview of Design Criteria
- 6-1.2 Optimization of Thermowell Design [Go to Page]
- 6-1.2.1 Factors Improving Mechanical Strength.
- 6-1.2.2 Factors Improving Thermal Performance.
- 6-2 CORROSION AND EROSION
- 6-3 FLOW-INDUCED THERMOWELL STRESSES [Go to Page]
- 6-3.3 Choice of Maximum Velocity Value
- 6-3.4 Flow-Induced Vibration of Thermowell Arrays
- 6-3.5 Turbulence-Induced Vibration of Thermowells
- 6-3.6 Low Fluid Velocities
- 6-3.7 Pulsed Flow
- 6-4 STROUHAL NUMBER, DRAG COEFFICIENTS, AND LIFT COEFFICIENT [Go to Page]
- 6-4.1 Strouhal Number [Go to Page]
- 6-4.1.1 Example.
- 6-4.2 Drag and Lift Coefficients
- 6-5 NATURAL FREQUENCY OF THERMOWELLS [Go to Page]
- 6-5.1 Transverse Vibrations
- 6-5.2 Finite Element Methods
- 6-5.3 Calculations and Correction Factors
- 6-6 MOUNTING COMPLIANCE FACTOR
- 6-7 UNSUPPORTED LENGTH, DIAMETER, AND FILLET RADIUS
- 6-8 FREQUENCY LIMIT [Go to Page]
- 6-8.3 Frequency Limit for the General Case
- 6-8.4 Frequency Limit When the In-Line Resonance Does Not Limit Operation
- 6-8.5 Passing Through In-Line Resonance Where the Design Does Not Meet the Cyclic Stress Requirements for Continuous Operation at Resonance
- 6-9 MAGNIFICATION FACTOR [Go to Page]
- 6-9.1 Magnification Factor Away From Resonance
- 6-9.2 Magnification Factor Near Resonance
- 6-10 BENDING STRESSES [Go to Page]
- 6-10.1 Point of Maximum Stress
- 6-10.2 Maximum Stress for Tapered or Straight Thermowells, No Shielding From Flow
- 6-10.3 Maximum Stress for Tapered or Straight Thermowells, Shielded From Flow
- 6-10.4 Maximum Stress for Step-Shank Thermowells, No Shielding From Flow
- 6-10.5 Maximum Stress for Step-Shank Thermowells, Shielded From Flow
- 6-12 STEADY-STATE STATIC AND DYNAMIC STRESS LIMITS [Go to Page]
- 6-12.1 Overview
- 6-12.2 Steady-State Stress Limits
- 6-12.3 Dynamic Stress Limits
- 6-12.4 Maximum-Stress Locations for Step-Shank Thermowells
- 6-12.5 Supercritical Operation
- 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 [Go to Page]
- 7-4.1 Necessary Dimensions
- 7-4.2 Material Properties
- 7-4.3 Temperature Dependence of Properties
- 7-4.4 Installation Details
- 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 [Go to Page]
- 8-1.1 Application, Properties, Dimensions, and Installation [Go to Page]
- 8-1.1.1 Steam Properties
- 8-1.1.2 Thermowell Dimensions.
- 8-1.1.3 Materials Properties.
- 8-1.1.4 Installation Details.
- 8-1.1.5 Reynolds and Strouhal Numbers.
- 8-1.2 Natural Frequency Calculation
- 8-1.3 Scruton Number Calculation
- 8-1.4 Frequency Limit Calculation
- 8-1.5 Cyclic Stress at the In-Line Resonance
- 8-1.6 Steady-State Stress at the Design Velocity
- 8-1.7 Dynamic Stress at the Design Velocity
- 8-1.8 Pressure Stress
- 8-2 STEP-SHANK, THREADED THERMOWELL FOR A HOT WATER APPLICATION SI UNITS [Go to Page]
- 8-2.1 Application, Properties, Dimensions, and Installation [Go to Page]
- 8-2.1.1 Fluid Properties
- 8-2.1.2 Thermowell Dimensions.
- 8-2.1.3 Materials Properties.
- 8-2.1.4 Installation Details.
- 8-2.2 Natural Frequency Calculation
- 8-2.3 Scruton Number Calculation
- 8-2.4 Frequency Limit Calculation
- 8-2.5 Cyclic Stress at the In-Line Resonance [Go to Page]
- 8-2.5.1 Evaluation at the Support Plane
- 8-2.5.2 Evaluation at the Base of the Reduced-Diameter Shank
- 8-2.6 Steady-State Stress at the Design Velocity [Go to Page]
- 8-2.6.1 Evaluation at the Support Plane
- 8-2.6.2 Evaluation at the Base of the Reduced-Diameter Step Shank
- 8-2.7 Dynamic Stress at the Design Velocity [Go to Page]
- 8-2.7.1 Evaluation at the Support Plane
- 8-2.7.2 Evaluation at the Base of the Reduced-Diameter Shank
- 8-2.8 Pressure Stress
- 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
- Tables [Go to Page]
- Table 6-5.3-1 Parameters for Natural Frequency Calculation 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]
- A-1 Conversion Factors Between SI and U.S. Customary Units
- A-2 Other Conversion Factors
- How can you reach us? ItŒs easier than ever! [Go to Page]
