Difference Between ASME Sec VIII, Div.1 & Div.2
Rinoj Rajan, L6σBB,MEngNZ,MIEAust,MIET, MIIRSM, MIMMM, PCQI, PMP?, RMP?
Mechanical Engineer ?? Strategic Quality & Project Leader ?? QHSE ? Inspection ? Expediting ? Project MGMT. ??? CSWIP 3.2 ??? BGAS Grade 2 ??? FROSIO Level III (Coating) ??? Lead Auditor - API & ISO (QMS ? EMS ? OHSMS)
1.??Pressure Limits
??ASME Div.1: Normally up to 3000 psig
??ASME Div.2: No limits, either way usually 6000+ psig
2.??Allowable Stress
S.allowable=min{(S.ultimate/Safety factor), (S.yield/1.5)}
The Value of “Safety factor”:
??ASME Div.1 (Sec. II, Part D, App. 1, Table: 1A or 1B): 3.5
??ASME Div.2-Class I (Sec. II, Part D, App. 2, Table: 2A or 2B): 3
??ASME Div.2-Class II (Sec. II, Part D, App. 10, Table: 5A or 5B): 2.4
??EN-13445: 2.4
??PD-5500: 2.35
3.??General, Design, Construction, Material
??ASME Div.1:
??Paragraph: U, UG, UW, UF, UB, UCS, UHA, UNF, UCI, UCL, UCD, UHT, ULT
??Design by rules “Max. Principle Stress”
??Generally elastic analysis
??Impact testing: Few restrictions on materials; impact required exempted; extensive exemptions under UG-20, UCS 66/67
??Welding and fabrication: Difference types with butt welds and other
??Design factor of Hydrostatic test: 1.3
??Very detailed design rules with quality (joint efficiency) factors. Little stress analysis required; pure membrane without consideration of discontinuities controlling stress concentration to a safety factor of 3.5
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??Experimental stress analysis: Normally not required
??ASME Div.2:
??Paragraph: AG, AM, AD, AF, AR, AI, AT, AS
??Class I (Part 4): Design by rules “Max. Shear Stress”. Part 5 shall not be used in lieu of Part 4.
??Class II (Part 4 and/or Part 5): Design by rules “Max. Shear Stress” and/or Design by analysis "Von-Mises Stress". Permitted to use Part 5 to overrule Part 4 in this class.
??Elastic/Plastic Analysis and more
??Impact testing: More restrictions on materials; impact required in general with similar rules as Div.1
??Extensive use/requirement of butt welds and full penetration welds including non-pressure attachment welds
??Design factor of Hydrostatic test: 1.25
??Fairly detailed design rules. In addition to the design rules, discontinuities, fatigue and other stress analysis consideration may be required unless exempted and guidance provided for in App. 4, 5 and 6
??Experimental stress analysis: Introduced and may be required
4.??PRE Certification of UDS (User’s Design Specification) and MDR (Manufacturer’s Design Report)
??ASME Div.1: Not Required
??ASME Div.2-Class I: When fatigue analysis shall be required, and when Part 5 is used, because Part 4 does not contain rules.
? ASME Div.2-Class II: Required
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Senior Machinery and Rotating package Equipment Engineer
4 个月Thanks for this and provide very insight