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Division 1 uses a safety factor of 3.5 on tensile strength. Division 2 uses a safety factor of 2.4 (for Class 1). This results in thinner, lighter vessels—saving material costs, especially in exotic alloys. asme bpvc section viii division 2 pdf
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Division 2 is about design philosophy, not pressure range. You can use it for 50 psi vessels if the design is fatigue-critical or weight-sensitive. Because ASME standards are copyrighted
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