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Design & Analysis of ASME Boiler and Pressure Vessel Components in the Creep Range

Maan H. Jawad
Maan H. Jawad
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Robert I. Jetter
Robert I. Jetter
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ASME Press
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Many vessels and equipment components encounter elevated temperatures during their operation. Such exposure to elevated temperature could result in a slow continuous deformation, creep, of the equipment material under sustained loads. Examples of such equipment include hydrocrackers at refineries, power boiler components at electric generating plants, turbine blades in engines, and components in nuclear plants. The temperature at which creep becomes significant is a function of material composition and load magnitude and duration.

Components under loading are usually stressed in tension, compression, bending, torsion, or a combination of such modes. Most design codes provide allowable stress values at room temperature...

1.1 Introduction
1.2 Creep in Metals
1.2.1 Description and Measurement
1.2.2 Elevated Temperature Material Behavior
1.2.3 Creep Characteristics
1.3 Allowable Stress
1.3.1 ASME B&PV Code
1.3.2 European Standard EN 13445
1.4 Creep Properties
1.4.1 ASME Code Methodology
1.4.2 Larson-Miller Parameter
1.4.3 Omega Method
1.4.4 Negligible Creep Criteria
1.4.5 Environmental Effects
1.4.6 Monkman-Grant Strain
1.5 Required Pressure Retaining Wall Thickness
1.5.1 Design by Rule
1.5.2 Design by Analysis
1.5.3 Approximate Methods
1.6 Effects of Structural Discontinuities and Cyclic Loading
1.6.1 Elastic Follow-Up
1.6.2 Pressure-Induced Discontinuity Stresses
1.6.3 Shakedown and Ratcheting
1.6.4 Fatigue and Creep-Fatigue
1.7 Buckling and Instability
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