Large Rectangle Openings in Vessel.
Large Rectangle Openings in Vessel.
(OP)
I am trying to verify the replacement area for a 17' 2" x 22' rectangle opening in a 40' diameter vessel with .635" wall thickness. Is ASME VIII Div 1 section 1-10 allowable to calculate the replacement area for this large of an opening?
Is replacement area the same regardless of shape? I could not find anything in Section VIII that specifically deals with this size of opening in a vessel. Did I overlook it?
Is replacement area the same regardless of shape? I could not find anything in Section VIII that specifically deals with this size of opening in a vessel. Did I overlook it?





RE: Large Rectangle Openings in Vessel.
Just a question.
Why would you replace such a large piece of the tank? Corrosion?
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: Large Rectangle Openings in Vessel.
RE: Large Rectangle Openings in Vessel.
The other restriction might be differantial deflections around the opening in case a flange connection involved.
Regards,
Ibrahim Demir
RE: Large Rectangle Openings in Vessel.
By the way, what is the design pressure?
RE: Large Rectangle Openings in Vessel.
RE: Large Rectangle Openings in Vessel.
RE: Large Rectangle Openings in Vessel.
I don't think the vessel is built, so no need for recertification. Section VIII has a number of exclusions to its scope and if this vessel fits into any of the relevant categories, the stamping would not be required. Maybe it's not in the US - I have seen vessels designed and built to ASME VIII, but subject to the European PED, so CE stamped in lieu of ASME U stamp. Just my 2 cents worth.
John
RE: Large Rectangle Openings in Vessel.
I am sorry guys for wasting your time
RE: Large Rectangle Openings in Vessel.
RE: Large Rectangle Openings in Vessel.
BUTCHCWIQAM I also thought it was an existing vessel
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: Large Rectangle Openings in Vessel.
RE: Large Rectangle Openings in Vessel.
Regards,
Ibrahim Demir
RE: Large Rectangle Openings in Vessel.
What it really seems like is that you're (unbolting and removing periodically) a section just about 1/4 of the around the tank wall.
Why not consider it like a pressure vessel of 20'-0" radious, then put a 2" thick x 3" wide reinforcement (for the (hundreds!) of tapped bolt holes around your 17 x 22 opening, then add the "cover plate" calculated as a tank wall of radius 20' 2"?
You won't want to use a "flat" cover plate.