4.4.1 Introduction 过程设备设计 Limitations of design-by-rule (3) Pressure vessel structures Codes Design-by-rule Design-by-analysis Structures Some structures Any structures Philosophy of design-by-analysis (1) Different types of stress have different degrees of importance to pressure vessels (2) If a proper stress analysis can be conducted, a better, less conservative design of pressure vessels can be made
6 3!Pressure vessel structures Structures Some structures Any structures Codes Design-by-rule Design-by-analysis Limitations of design-by-rule: Philosophy of design-by-analysis 2!If a proper stress analysis can be conducted, a better, less conservative design of pressure vessels can be made. 1!Different types of stress have different degrees of importance to pressure vessels; 4.4.1 Introduction
4. 4.2 Stress categories of Pressure vessels 过程设备设计 4.4.2 Stress Categories of Pressure Vessels 4.4.2.1 Stress Categories Basis for stress category: hazards to pressure vessels Determining factors (1)location and distribution (2) types of loading Major stress categories: primary, secondary, peak
7 4.4.2 Stress Categories of Pressure Vessels 4.4.2 Stress Categories of Pressure Vessels 4.4.2.1 Stress Categories Basis for stress category: hazards to pressure vessels Determining factors: (1) location and distribution; (2) types of loading Major stress categories: primary, secondary, peak
4. 4.2 Stress categories of Pressure vessels 过程设备设计 Primary stress(P: Definition: developed by the imposed loading; necessary to satisfy the laws of equilibrium between external and internal forces and moments Basic characteristic: not self-limiting Sub-categories: general primary membrane stress (Pm), local primary membrane stress(PL), primary bending stress(Pb)
8 4.4.2 Stress Categories of Pressure Vessels Definition: developed by the imposed loading; necessary to satisfy the laws of equilibrium between external and internal forces and moments Basic characteristic: not self-limiting Sub-categories: general primary membrane stress (Pm), local primary membrane stress (PL), primary bending stress (Pb) Primary stress (P):