Technical basis for code cases on design of ellipsoidal and torispherical heads for ASME section VIII vessels

ASME Boiler and Pressure Vessel (B&PV) Code Committees have approved Code C ases 2260 and 2261 on the design of ellipsoidal and torispherical heads for Section VIII Division 1 and Division 2 vessels, respectively. Burst and lo w-cycle fatigue failure modes have been considered. A rationale is provided for including the foregoing referenced failure modes, and not including ot her failure modes such as dimensional changes, plastic collapse, knuckle yi elding, etc. The basis for the specified design formulas to satisfy the bur st and low-cycle fatigue criterion is discussed. The paper also discusses l imitations and other requirements that have been imposed in the Code Cases. [S0094-9930(00)01401-3].