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ASME Section I PG-29 Dished Heads

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M1Can

Mechanical
Feb 8, 2005
26
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



M1 Engineering
 
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