Re: [MW:9999] Elongation Percentage for Dish End / Calculation

Vino,   Unless it is goverened by your specification, You can use the formula given in ASME Sec.VIII Div.I UCS-79 for Heads which is given below.   % Extreme fibre elongation = 75t\Rf(1 - Rf/Ro)   where   t - plate thickness Rf - Final centreline Radius Ro - original centreline radius)   If you form your Head in stages, then after each stage you need to calculate the Fibre leongation and ensure it is within 5% else if it is formed in one stroke then calculate fibre elongation using the above formula and ensure it is within 5 %, else you need to Heat Treat + your required testing. J.GERALD JAYAKUMAR 00919344954677   --- On Wed, 2/23/11, Vino Varghese <vinopvarghese@gmail.com> wrote: From: Vino Varghese <vinopvarghese@gmail.com> Subject: [MW:9982] Elongation Percentage for Dish End / Calculation To: materials-welding@googlegroups.com Date: Wednesday, February 23, 2011, 9:55 AM Dear Friends/Advisers,   Design: ASME Sec VIII, Div 1. Material & Thickness: SA 516 Gr.70 & 30 mm.   1. Please provide a method to calculate Elongation % after Forming(Hot/Cold) for Pressure Vessel Dish End.(Ellipsidol 2:1) 2. What should be the thickness selection to achieve 30 mm final thickness? 3. How to ensure that Materials Fibre Elongation is less that 5%? This is required to avoid SSC Test with regard to NACE requirement.   Hope to see as usual co-operation.   Regards Vino P Varghese Doha-Qatar -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.