Flange Thickness

Are you doing this to a piping or vessel code - or just general mechanical design?

What is this for specifically? Does it need to contain a fluid pressure?

Just general mechanical design...

(Side cover for Power steering unit)

dear sir,

i required how to deside the flange when flange standard is not standard. if we using minimum thickness if you have formula for this please give me reply

Please refer to the following CR4 threads for design of blind flange under internal (or external) pressure as per ASME Code, Section VIII, Division 1:

• can you tell me thickness calcu........ &

• External Pressure Blind Flange

Side cover flange thickness for Power steering system....

Inside pressure may be 200bar

I would like to have formula with related to No. of bolt & Bolt position.....

It seems you actually have two questions/problems -

1. Design of bolts/gaskets
2. Design of cover plate

So I would suggest

1. Do a quick look into what size and number of bolts you will need for your pressure and size of opening.
   
2. Download a program such as this: https://www.klingeruk.co.uk/pages/klinger_expert
3. Figure out all the details on your bolting/gasketing/torquing
4. Post that information here
5. I can give a thickness of the cover plate based on this information and a material.
1. You could design the cover to ASME, however, I think that will be too conservative for you (particularly with the allowable stresses they use - but that could be adjusted, anyways ................)
2. I have a better solution/calculation for your cover plate, see: http://www.springerlink.com/content/p77mk14727066602/fulltext.pdf?page=1
3. Alternatively - design the cover plate with FEA.

That also depends on pipe diameter.

But this looks rather like a college question to me. If so, you should be consulting your textbooks and working things out for yourself; (in any case, asking help with coursework contravenes CR4 house rules)