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Code calculation

One important component of the standards for pressure vessels is the use of a safety factor. The measured physical properties of a material, including ultimatetensile strength, are divided by a defined safety factor to derive the maximumallowable stress. In this way, allowance is made for limitations in the testingtechnology, unusual stress concentrations, non-uniform materials, and materialflaws. Technological improvements, especially in materials testing, have allowed areduction in the safety factor to 3.5 in current editions of Section I; this is thesame factor used in Sections VIII-1 and VIII-2

Circumferential stress (longitudinal joints)l





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