Flat Top of Cyclone Filter

[MHS1988]

Hello everyone,
I am designing a cyclone filter with a flat top though which a large nozzle passes.
The cyclone is working in full vacuum condition with zero internal pressure at a design temperature of 200°C.
The calculated thickness for both drum and conical section is 8 mm. Material is SS316L and C.A. is 0.
The ID of the drum is 1650mm and the large nozzle on top has a diameter of 960mm. According to App. 14 the thickness of the flat head must be almost 50mm. This thickness doesn't sit right with me and I have seen drawings of cyclone filters with somewhat similar dimension and design conditions having way thinner heads (12~15mm). Am I doing something wrong in using App. 14? Is there another way to calculate this thickness?
I add the sketch of the cyclone filter for reference. The nozzle in question is N2 on top.

Thanks in advance for your kind inputs.

 

[pierreick]

Hi,
Consider this resource to support your design work, it may not answer your specific question.
If I remember well, you will find information in Perry's Chemical engineer's handbook
Pierre