General Design Criteria for Pressure Vessels

2 General Design Criteria for Pressure Vessels 4.2.1 Introduction 

ASME provides necessary formulae to compute vessel sizes and membrane stresses of the vessel due to internal and external pressures it leaves to the designer to carry out analytical procedures for computing stresses due to other loads including combinations of loads. 

However, it is a general practice to provide detailed stress analysis for the vessel components outside the Code approved details using either the maximum-stress or the maximum-shear theory of failure and to select allowable stresses for design conditions other than normal operations or for computed stresses other than direct membrane or direct membrane plus primary bending Code stresses. CEGB R6 method based on fracture mechanics is highly recommended. This method later on has been thoroughly discussed in this chapter. 

DESIGN CONDITION PRESSURE WEIGHT LOAD OVERLOAD LOAD LOAD STRESS NOTES  

Sa - basic code allowable stress value at design metal temperature 

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