I am currently designing a pressure swing vessel. The pressure will swing from +85 psig to near full vacuum every 2 minutes, 24/7, for a 30 year lifespan. In the past, we have had these evaluated and stamped as U1 vessels. In speaking with my previous AI, the code may have changed for non standard vessels. Doing a keyword in Section VII, most hits for cyclic loading fall under bellows.
So my questions, can anyone give guidance on how I would design and qualify this loading condition as a U1? or should I pass this to a U2 shop and stop thinking about it.
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