Mar-ha-ba Masoomeh,

A rotary kiln is a mechanical structure. It can be assessed using basic engineering principles.

1 - For preliminary design assume that the shell is a thick tube simply supported on two bearings [see www.cospire.com / Engineering Tips / Quick Structures].

2 - Once you have an approximate design, you can start detailing.

3 - What material will you use for the shell? What will be the strength of the steel at operating temperature? [Talk to your specialist Steel Supplier. They have Technical representatives who can advise you - but be sure to ask them what practical experience they have had with supply of kiln platework for maintenance of existing kilns. If they have no experience, go to another Supplier - it's not worth the risk].

4 - What derating is required for the multi-pass butt welds on the plates? What will be the fatique / stress range effects? [See ASME Boiler Code].

4a - Do a Failure Mode and Effects Analysis [FMEA] on the kiln design [see www.cospire.com / Engineering Tips / Hazard Analysis].

4b - To check the final design, do an Finite Analysis [FEM] on the shell. You don't have to do it all yourself. Talk to a Consulting Engineer experienced in using FEM.

5 - What lining material will you use? Talk to experienced Maintenance Engineers at other Plants.

6 - How will the lining be fixed to the shell? What details are required? Ask the Maintenance Engineers.

7 - How will you get the lining material into the shell? Ask the Maintenance Engineers.

8 - What are the Safety Issues involved? [see www.cospire.com / Engineering Tips / What If Risk Analysis].

Shuu-ra'-yak?

Ta-hiy-yaa-ti - John.Rz ■