Outer and Inner ring - calcs

[mech8790]

Hi Everyone!

Can somebody point me where I can find the way how to calculate minimum thickness and height for the outer ring with an o-ring groove and the inner ring which is a filter plate please?

Design code: ASME VIII Div 1
Lodad: Internal Pressure, filter and water mass above filter plate

Please find screenshots below:

Cheers!

 

[mk3223]

The inner filter supporting plate is a non-pressure part. The thickness can be calculated based on the the weight of the filter and the force of the fluid movement.

 

[mech8790]

Hi mk3223,

Thank you for your comment. Can you elaborate why this is not a non pressure part? Internal pressure is acting on the filter plater from the bottom and the top. Is it the reason why the filter plate is treated as a non pressure part?

Any thought about outer ring?

Cheers,
Michal

 

[mk3223]

the inner plate is a non-pressure part since the internal pressure on top and bottom of it were cancelled with each other. It's a non-pressure part welded on the pressure vessel internal wall.

I am not clear how the outer ring was attached to the vessel, so I don't have any comment about it.

 

[mech8790]

Hi mk3223,

thank you again for your comment. The outer ring is welded with two fillet weld in the corners (bottom and top).I reckon, this joint should be calculated as follows:

a) top flange thickness in accordance with figure UG-34 (k) and eq UG-34 (c)(2)(2)
b) outer ring in accordance with Mandatory Appendix 2, figure 2-4 (3a) with a flange shape modification and 2.7 calculations of flange stresses should be replaced with calculation of swing bolt bracket stresses.

What do you think about that?

Cheers,
Michael

 

[ROUNDENG]

Hello Michael Kolbuc,

I agree the outer ring shall be calculated per ASME VIII-1 Appendix 2 as you state.

Regards,

Scott