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ASME Standards Section VIII, Division 1 For tensile strength, the code requires a safety factor of 3.5 for non-bolting and 4 or 5 for bolting. In addition, if the product form is welded tube or pipe, a joint efficiency factor of 0.85 is typically applied. This can be seen by several of the notes in the stress tables.

ASME Section VIII, Division 2 is intended for purpose-specific vessels with a defined fixed location. Another major difference between the Division 1 and Division 2 lies in failure theory. While Division 1 is based on normal stress theory, Division 2 is based on maximum distortion energy (Von Mises).

ASME Section VIII is the section of the ASME Boiler & Pressure Vessel Code (BPVC) that covers pressure vessels. It specifically refers to the pressure vessels that operate at pressures, either internal or external, that exceed 15 psig. ASME Section I covers steam applications on fired vessels (boilers).

ASME Section VIII in itself consists of three divisions, where Division 1 is concentrated on a design-by-rule approach and Division 2 on the design-by-analysis approach. Division 3 is supposed for designing pressure vessels that need internal or external operating at a pressure above 10,000 PSI.

One of the main differences between Divisions 1 and 2 is that Division 2 uses lower design margins often resulting in higher material allowable stresses. Design margins are reduction factors applied to the material's ultimate tensile strength (UTS) for the purpose of setting material allowable stresses in ASME II-D.

ASME Section VIII, Division 2 is intended for purpose-specific vessels with a defined fixed location. Another major difference between the Division 1 and Division 2 lies in failure theory. While Division 1 is based on normal stress theory, Division 2 is based on maximum distortion energy (Von Mises).

What Is ASME Section VIII? ASME Section VIII is dedicated to giving detailed requirements for the design, fabrication, inspection, certification, and testing of both unfired and fired pressure vessels, especially those that operate at pressures exceeding 15 psi.