Box Header Design
Box Header Design
(OP)
We don't normally do traditional air coolers, but we've got a couple of replacement designs on our plate now. Not that it matters much to the following, these are design to Code, no stamp, no API 661, no specs, etc. We do not have commercial air cooler design software, nor API 661.
I am curious how box headers are traditionally designed. A little googling makes me beleive Appendix 13 is used for the header itself, yes? Is a ligament efficiency used in the plug & tubesheets? If so, UG-53?
How are the nozzle openings handled? If imposing limits of reinforcement I cannot believe a UG-37 calculation will make. One of these designs has transition nozzles or swages, just makes it that much worse. Is the header considered to be self-reinforcing? How is this demonstrated?
Did a site search, found this: thread794-76357: Non-circular pressure vessels, and a few references to Nozzle-Pro. What did we do before Nozzle Pro?
Thanks in advance for any insight.
Mike
I am curious how box headers are traditionally designed. A little googling makes me beleive Appendix 13 is used for the header itself, yes? Is a ligament efficiency used in the plug & tubesheets? If so, UG-53?
How are the nozzle openings handled? If imposing limits of reinforcement I cannot believe a UG-37 calculation will make. One of these designs has transition nozzles or swages, just makes it that much worse. Is the header considered to be self-reinforcing? How is this demonstrated?
Did a site search, found this: thread794-76357: Non-circular pressure vessels, and a few references to Nozzle-Pro. What did we do before Nozzle Pro?
Thanks in advance for any insight.
Mike





RE: Box Header Design
MikeG7
RE: Box Header Design
Regards,
Mike
RE: Box Header Design
The rest of the header is to Appendix 13 as you noted. Appendix 28 also covers alternative corner joint details.