All,
I am designing a vertical vessel which has nozzles with inner diameters that are more than 25% of the vessel ID. Is there a way to build a vertical vessel with large openings (>25%) without using Part 5?
If you're designing to ASME VIII-2, Part 4, then there is no alternative analysis for openings > the 25% rule. IMO, this is based on the analysis method used for allowable longitudinal compression and combined loads, rather than being directly related to the nozzle opening method.
A lot of designers are using Code Case 2695 to use the Div 2 rules in Div 1, especially for large openings now that Appendices 1-9 and 1-10 have been removed from Div 1. But then their designs fall afoul of the 25% rule. A problem.