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

By Materials & Welding
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
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