REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
(OP)
Hello there, We have 36" id elliptical head and we need to put 24" manway on that. Manway is cutting through Knuckle of head. Per UG-36(b)(2)there is no limitation on size of the opening as long as you reinforce it.
But can nozzle cut the knuckle of head? does code have any limitation for this anywhere? Vendor says he can reinforce it with internal projection. Any reference or personal experience?
Thanks in advance for your help.
But can nozzle cut the knuckle of head? does code have any limitation for this anywhere? Vendor says he can reinforce it with internal projection. Any reference or personal experience?
Thanks in advance for your help.





RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
forget the head and the neck on that manway
make a cone for that top head directly to the manway flange
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
If the head is 2:1 ellipsoidal and the manway is located in the center of the head, the opening is NOT in the knuckle region.
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
with a cone shown just as a reference to show you how it works.
this does away with reinforcement problems
most folks don't think about
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
Why do not use a reducer 36"/24" by considering the materials and thicknesses of the shell and the reducer instead? It will engage additional 610 mm.
Or if the cylindrical shell/ pipe has larger thickness than the reducer you may not use it, however you may use a cone transition between two sizes unless you have a space problem to fit. Sometimes rolling the cone that has high thickness to small diameter can be a problem. The cone may be hot rolled but it may require a specialised manufacturer.
Therefore you will not have any reinforcement problem.
Hope this helps,
Ibrahim Demir
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
Another way is to use a forged reverse flange in accordance with ASME Sect VIII Div 1 Appx 2 instead of using a head with large opening.
Kind regards,
Ibrahim Demir
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
Possibly. See Appendix 1-7 & 1-8.
-Christine
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
1.8 does apply...of course.
but again, this solution is to do away with the problems of large diameter openings in small elliptical heads.
reinforcing cones is much easier tha reinforcing the original opening.
less material, less labor, less engineering, less problems.
makes for a much cleaner product
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
Joe Tank
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
Thank you again for replying.
Cheers
dygorane
RE: REINFORCEMENT OF OPENING IN ELLIPTICAL HEAD
It will seem a bit odd to post at this stage.
Another option would be to have body flanges. In other words the 2:1 SE head is welded to a body flange. We commonly opt for body flanges in vessels <= 36" instead of manways. Is the vessel under question have internal trays/ pakings? If yes, then its better to have a flanged column without manways.
This will eliminate the 24" NPS manway and at the same time permit access to the vessels inside.
You just need to check if there is room/ space to remove the head.
-jehan