Power Boilers: A Guide to the Section I of the ASME Boiler and Pressure Vessel Code, Second Edition
15 Determination of Allowable Stresses
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Each section of the Code uses design criteria and design stresses appropriate for the components that it covers. The basis for establishing allowable stresses is related to the design philosophy, the type of construction permitted, the degree of analysis required, and the amount of nondestructive examination mandated. Sections I, IV, and VIII, Division 1, use a design approach sometimes called design-by-rule. Design-by-rule is not based on detailed stress analysis. Instead, the rules generally involve the calculation of average membrane stress across the thickness of the walls of the vessels. That is not to say that these sections of the Code...