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STAYED JACKET

STAYED JACKET

STAYED JACKET

(OP)
I am designing a vessel to ASME SECT VIII DIV 1 with a toriconical head and a toriconical jacket on the outside.  Both cones are made of the same material.  The inner cone is 1 1/4" thick due to external (jacket) pressure.  The outer cone is 1/2" thick.  I am trying to reduce the thickness of the inner cone to 3/4" by using stay bars.  UG-47(c) reads, “If a stayed jacket extends completely covers a formed head, it shall meet the requirements given in UG-47(a), and shall also meet the applicable requirements for heads in UG-32”.  In order to meet UG-47(a), the thickness of the outer cone have to be increased from 1/2" to 3/4".  Have I interpreted the code correctly?  Does it make sense that I have to increase the thickness of the outer cone by adding stay bars?

RE: STAYED JACKET

UG-47(a)is about flat plates or pressure retaining parts which should be treated as flat plates. A jacket need not necessarily take the shape of a formed head, and in cases where it is either a flat plate or should be treated as a flat plate, it should be calculated as a stayed flat plate. But for a conical head (or for any other formed head like an ellipsoidal head), it need not be considered as a stayed flat plate, therefore, additional stiffening is not required.

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