Maximum Size of Skirt Openings
Maximum Size of Skirt Openings
(OP)
I have a number of references regarding column skirt designs but none of them address skirt openings very well. Are there any guidelines regarding the maximum size of skirt openings? Personally, I've limited them to about .3D.
I have a small column that the client want a very large opening in (.75D). I cannot do this, I've told them I can't do this, but it would be nice if I had a chapter and verse or some expert commentary to support my position.
Best Regards,
MIchigander
I have a small column that the client want a very large opening in (.75D). I cannot do this, I've told them I can't do this, but it would be nice if I had a chapter and verse or some expert commentary to support my position.
Best Regards,
MIchigander





RE: Maximum Size of Skirt Openings
Brian
RE: Maximum Size of Skirt Openings
RE: Maximum Size of Skirt Openings
So… I'd recommend that you calculate the moment of inertia of the skirt without an opening, then calculate the moment of inertia with an unreinforced opening, then calculate how much reinforcement you'd need to maintain the original moment of inertia. If you do, let us know what you come up with!
jt
RE: Maximum Size of Skirt Openings
I looked in Bednad and blew right by it.
Best Regards,
Michigander.
RE: Maximum Size of Skirt Openings
http://www.coade.com/company_newsletter.asp
RE: Maximum Size of Skirt Openings
I recently did a relatively small vessel (4 m dia x 55 m OAH) with a 2:1 SE bottom head where a skirt extended down to approximately the bottom bottom nozzle in the head. From that point down the skirt was supported on four legs.
Their issue was access and removing a large piece of equipment that bolted into the bottom flange every 18-24 months.
The legs were cross braced but designed to not need the bracing with vessel empty + design wind. Placards were attached to the vessel legs that stated bracing had to be installed except for removing the outlet device and the vessel being empty. This was also in the O&M manual. This has successfully been done on vessels that have been in service for nearly 50 years.
Not the most economical option but it provided access.
Just another way of looking at it.
dig1
RE: Maximum Size of Skirt Openings