ASME Section I PG-29 Dished Heads
ASME Section I PG-29 Dished Heads
(OP)
I am looking for some help interpreting the required thickness of a semielipsoidal head with a manway. In the past we sized the head thickness based on a blank unstayed head and provided reinforcement for the manway opening ( Re PG-29-4)
But we were recently reviewing a new customers calculations and they size the thickness of the head per PG-29.3 which results in a head thickness of almost double that required for a blank unstayed head ( although no reinforcement is required).
I think it comes down to what is considered "a flanged in manway" , is this an opening integral to the head ie pressed in. The frames for the manways we have experience with are bar rolled and welded into the head , which we check to ensure that they provide adequate reinforcement for the opening.
Any help on this will be greatly appreciated
But we were recently reviewing a new customers calculations and they size the thickness of the head per PG-29.3 which results in a head thickness of almost double that required for a blank unstayed head ( although no reinforcement is required).
I think it comes down to what is considered "a flanged in manway" , is this an opening integral to the head ie pressed in. The frames for the manways we have experience with are bar rolled and welded into the head , which we check to ensure that they provide adequate reinforcement for the opening.
Any help on this will be greatly appreciated
M1 Engineering
http://www.m1engineering.ca





RE: ASME Section I PG-29 Dished Heads
In my opinion your approach based onto PG-29.4 is the correct one.
prex
http://www.xcalcs.com
Online tools for structural design
RE: ASME Section I PG-29 Dished Heads
Are going to use the flanged-in manway or the welded ring?
why are you mixing the two;
if you customer calculated with a flanged-in and the construction is with a welded ring your customer calcs are wrong.
I think that only Cleaver-Brooks fabricate flanged-in manways these days.
RE: ASME Section I PG-29 Dished Heads
I also agree with GenB that the calculation needs to reflect a welded ring manway.
Thanks Again
M1 Engineering
http://www.m1engineering.ca