ASME section VIII Div 1 - Code Case 2695

Case 2695Code Case to Allow Section VIII Division 2 Design Rules to be used for a Section VIII Division 1Pressure VesselInquiry: Under what conditions may the Design-By-Rule Requirements in Part 4 of Section VIII Division 2be used to design components for a Section VIII Division 1 Pressure Vessel?Reply: It is the opinion of the Committee that the Design-By-Rule Requirements in Part 4 of Section VIIIDivision 2 may be used to design components for a Section VIII Division 1 Pressure Vessel, providedthe following conditions are met.a) The allowable design tensile stress shall be in accordance with UG-23 of Section VIII Division 1.b) The weld joint efficiency shall be established in accordance with UW-11 and UW-12 of Section VIIIDivision 1.c) Material impact test exemptions shall be in accordance with the rules of Section VIII Division 1.d) If the thickness of a shell section or formed head is determined using Section VIII Division 2 designrules, then;1) For design of nozzles, any nozzle and its reinforcement attached to that shell section or formedhead shall be designed in accordance with Section VIII Division 2,2) For conical transitions, each of the shell elements comprising the junction and the junction itselfshall be designed in accordance with Section VIII Division 2,3) For material impact test exemptions, the required thickness used in the coincident ratio definedin Section VIII Division 1 shall be calculated in accordance with Section VIII Division 2.e) The fatigue analysis screening in accordance with Part 4, paragraph 4.1.1.4 of Section VIII Division 2,is not required. However, it may be used when required by UG-22 of Section VIII Division 1.f) The provisions shown in Part 4 of Section VIII Division 2, to establish the designthickness and/or configuration using the Design-by-Analysis procedures of Part 5 of Section VIIIDivision 2 is not permitted.g) The Design Loads and Load Case Combinations specified in Part 4, paragraph 4.1.5.3 of Section VIIIDivision 2 are not required.h) The primary stress check specified in Part 4, paragraph 4.1.6 of Section VIII Division 2, is not required.i) Weld Joint details shall be in accordance with Part 4, paragraph 4.2 of Section VIII Division 2, withthe exclusion of Category E welds.j) The fabrication tolerances specified in Part 4, paragraphs 4.3 and 4.4 of Section VIII Division 2 shallbe satisfied. The provision of evaluation of vessels outside of tolerance per Part 4, paragraph 4.14 ofSection VIII Division 2 is not permitted.k) The vessel and vessel components designed using these rules shall be noted on the Manufacturer'sData Report.l) All other requirements for construction shall comply with Section VIII Division 1.m) This Code Case Number shall be shown on the Manufacturer's Data Report.