dear jprashant31, you may refer to Chapter 8 " Bending, Forming, Drawing & forging dies 1n the 3rd Edition of " Fundamentals of Tool Design " published by David T.Reid, Society of Manufaturing Enginneers. Dearborn, MI 48121-0930. ISBN No. 13978-0-87263-412-1, Further ref. www.books-by-isbn.com. Rangasamy
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I can't tell if this is what you are actually looking for for your problem, but try Structural Analysis & Design of Process Equipment by Maan H. Jawad and James R. Farr, an excellent resource for anyone who works with pressure vessels and vessel design. Check Chapter 17.
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If you can't do it right the first time ... do it wrong, then let the professionals fix it.