Appendix 13 - stayed headers

[Shellandtubes]

Hi folks,

I am designing a rectangular header box for a fin-fan cooler to Appendix 13. All the usual calculations have been performed and the item is designed with a permanent stay bar to divide the unit into two tubeside passes.

I want to design the return header with a stay plate to reduce thickness of plug plate and tubeplate etc. If I cut flow holes in this plate (equivalent in area to the tube csa) can I simply perform a metal replacement calculation on the plate and increase it's thickness accordingly?

The item will be U Stamped but I cannot contact our authorized inspector at present and I was wondering if anyone could offer a view on our proposal.

Many thanks

 

[heatexguy]

When you are doing the calculations for the return header, you must determine the ligament efficiency of the stay plate with holes, such as you have done for the tubesheet.