The Code Case 2260 for ASME Section VIII Division 1 allows for alternative rules for design of ellipsoidal and torispherical formed heads subjected to internal pressure. Additional provisions are required in the Code Case for the alternative design rules. These provisions include restrictions on opening sizes in the knuckle region of the head, maximum metal temperature and others. There is one particularly significant provision in this Code Case in that the Case has been developed for a fatigue life of 400 full pressure range cycles with non-integral attachments and 1000 full pressure range cycles with integral attachments. Design of heads
exceeding this fatigue life would require Para. U-2(g) consideration
and analysis.
Cheers,
gr2vessels
