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

摘要

Code Cases on the design of ellipsoidal and torispherical heads for Section VIII Division 1 and Division 2 vessels have been developed and are proceeding under item BC 80-651 through the ASME B&PV Code Committees for approval. Burst and low cyclefatigue failure modes have been considered. A rationale is provided for including the above referenced failure modes and not including other failure modes such as dimensional changes, plastic collapse, knuckle yielding, etc. The basis for the specifieddesign formulas to satisfy the burst and low cycle fatigue criterion is discussed. The paper also discusses limitations and other requirements that have been imposed in the Code Cases.