5 foot manway on storage tank
5 foot manway on storage tank
(OP)
As the title says, we have a client who wants a 5' manway on the shell...
Now per 650, this wouldn't be a "manway" but would just be a 60" nozzle. Based on some catalog lookups, a flange/blind combo would be a minimum of ~3000 lb (for 75# flange and blind), at a minimum required offset distance from the shell of 16 inches, per 650. I know 650 gives reinforcement requirements based on area, but it doesn't explicitly address the weight on nozzles due to flanges (to my knowledge- please advise if otherwise). Do flanges and blind covers need to be analyzed under Annex P? Or are these considerations built into the 650 reinforcement requirements from 5.7?
Now per 650, this wouldn't be a "manway" but would just be a 60" nozzle. Based on some catalog lookups, a flange/blind combo would be a minimum of ~3000 lb (for 75# flange and blind), at a minimum required offset distance from the shell of 16 inches, per 650. I know 650 gives reinforcement requirements based on area, but it doesn't explicitly address the weight on nozzles due to flanges (to my knowledge- please advise if otherwise). Do flanges and blind covers need to be analyzed under Annex P? Or are these considerations built into the 650 reinforcement requirements from 5.7?





RE: 5 foot manway on storage tank
I would doubt that Annex P could be used on a 60" nozzle, for that matter, but haven't checked to see.
RE: 5 foot manway on storage tank
RE: 5 foot manway on storage tank
They go up to 1219 x 1219 opening. maybe not 60", but pretty close and a lot easier to actually get inside the tank
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: 5 foot manway on storage tank
I appreciate everyone's responses.
RE: 5 foot manway on storage tank
Has the maintenance department made comment yet.... Or have you only taken instruction from the MBA on the job ?
Will they ask next week for a giant davit and jacking device to get the damn thing off and on ?
Please share with us pictures/drawings of the final design
MJCronin
Sr. Process Engineer
RE: 5 foot manway on storage tank
There's always the exception, but normally little tanks have little nozzles and bigger nozzles are on bigger tanks. So there's probably a presumption that if you're using a 60" shell nozzle, you have some monster tank that it's attached to, and that 3,000 lb weight is not too significant. Now, if you're putting a 60" nozzle into a 40' tank with 3/16" shell, you may have a more questionable situation.
RE: 5 foot manway on storage tank
What's the engineering function to spend $ fro a 5' manway for the tank?
RE: 5 foot manway on storage tank
How many of these huge expensive manways does the client want on the shell ? Most clients that I have specified 650 tanks for want two shell manways
(Telling us that "that is what the client wants" is unacceptable
I have never seen a piece of tank equipment that requires a shell nmanway bigger than 40"
Furthermore, if there is something large that must go into and out ofthe tank, a large square access hatch on the roof will be much easier to use.
http://www.eng-tips.com/viewthread.cfm?qid=160574
MJCronin
Sr. Process Engineer
RE: 5 foot manway on storage tank
They plan on going in these tanks every year and replacing/repairing the internal components, one of which they say is 4'-9" wide. We suggested they cut a slit or doorsheet, but they do not want to cut/weld every year, and want a more permanent situation.
I think at this point we are going to refer them to a tank fabricator who could probably do this project turnkey, which is probably safer and more cost effective than us engineers designing our own davit, and having this project blow up in cost and be dragged out.
Thank you everyone for the input.
RE: 5 foot manway on storage tank
RE: 5 foot manway on storage tank