Swaged Nozzle Design as per Section VIII Div. 1

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Mechie Active Contributor Join Date: Dec 2008 Posts: 24	Swaged Nozzle Design as per Section VIII Div. 1 04/12/2009 1:48 AM
	Dear All, I am designing a swaged type of nozzle (one end cirular and one end ellptical). Is there any specific method to design such type of nozzle as per code? Currently I am designing it Considering the walls of nozzle as welded flat plate and using formullie of UG-34. Thanking in Advance.
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XMech Power-User Join Date: Jan 2009 Location: Western Canada Posts: 295 Good Answers: 51	#1 Re: Swaged Nozzle Design as per Section VIII Div. 1 04/12/2009 2:38 AM
	Use this formula for the minimum thickness of elliptical nozzles: t = Pa²b²/[SE(a²sin²Φ + b²cos²Φ)^3/2] Where: a = major radius of the ellipse, in. b = minor radius of the ellipse, in. E = joint efficiency factor P = design pressure, psi S = allowable stress, psi t = thickness, in Φ = as defined in picture below. (Don't forget to add any corrosion allowance to that minimum thickness) Taken from the Guidebook for the Design of ASME Section VIII Pressure Vessels __________________ A little knowledge is a dangerous thing.
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Lawrence Commentator Join Date: Jun 2007 Posts: 70 Good Answers: 6	#2 In reply to #1 Re: Swaged Nozzle Design as per Section VIII Div. 1 04/13/2009 9:37 AM
	Can you cite a source or derivation for your minimum thickness of elliptical nozzles formula? For use in the Code, U-2(g), "good engineering practice", would need to be invoked and the geometry would have to be not covered by any of the Code rules. The Code, ASME Section VIII-1, Appendix 13 "Vessels of Non-circular Cross Section", does not directly deal with elliptical cross sections (it covers obround, stayed, and rectangular cross sections).
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XMech Power-User Join Date: Jan 2009 Location: Western Canada Posts: 295 Good Answers: 51	#4 In reply to #2 Re: Swaged Nozzle Design as per Section VIII Div. 1 04/13/2009 3:13 PM
	Yes, (the link was given) Guidebook for the Design of ASME Section VIII Pressure Vessels ISBN #: 9780791802397 Published: 2006 Publisher: ASME Press Which credits the theory of elliptical cylinders (Flugge, 1967): Flugge, W., 1967, Stresses in the Shells, New York, Springer-Verlag __________________ A little knowledge is a dangerous thing.
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Mechie Active Contributor Join Date: Dec 2008 Posts: 24	#3 Re: Swaged Nozzle Design as per Section VIII Div. 1 04/13/2009 11:06 AM
	Thanks a lot XMech !
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