UG46(j) why this 11/16" requirement
UG46(j) why this 11/16" requirement
(OP)
I was trying to find an elliptical manway (11 x 15)to put into a 12ga small shell. All seemed to have heavy walls. I happened across UG46(j) which requires 11/16" wide flat gaskets on internally energized manway. What is the reasoning or engineering behind this requirement?





RE: UG46(j) why this 11/16" requirement
What pressure will your thin-walledd vessel see?
Gasket width must be wider than the bolt holes that penetrate the (usual) gasket.
RE: UG46(j) why this 11/16" requirement
this is a cover that has yoke and pulls from outside
no bolt holes
RE: UG46(j) why this 11/16" requirement
I've done the calculations on this manway as a nozzle and it does not require a wall anywhere near 11/16". (I did say 11/16" gasket width, but UG46(j) actually says minimum gasket bearing width, not quite the same).
Commercially available code manways seem to have at least 3/4" wall, so manufacturers must know about this.
I would still like to know the logic, if any behind this requirement. The large weight of this type of manway will kill this project. Can I use thinner wall?
Any help from the code mavens would be appreciated.
RE: UG46(j) why this 11/16" requirement
by the time you got partial data on a smaller neck and a code stamp for different yoke design....
you will have wasted a lot of time, effort and money
They are cheeeeeep
just call up LA Boiler and order one and don't worry about it.
RE: UG46(j) why this 11/16" requirement
The cost of the manway was not an issue. This vessel has trunions on both ends (heads,horizontal vessel)and the eccentric weight of the manway required a much larger motor to turn the vessel, probably killing the project.
Thanks for your help.