Exhaust Stack Design 1

[StructTaco]

I am designing an exhaust stack for a diesel engine/generator. The stack is 55' tall, and has exhaust temperatures around 650 degrees. I am doing the structural design, but I thought I should research the temperature implications. The SMACNA GSSC Design Guide limits the design to 300 degrees. Is 650 degrees a problem? How do I account for the temperature? Will the base plate move to the point that I shouldn't anchor it with any welded connections?

Just thinking out-loud...are there any other good design references for self-supporting/free-standing stack design?

Thanks,

StructTaco

 

[willard3]

You will do better if you contact the stack supplier. There are stacks rated for many different temperatures, but their designs are different.

 

[fegenbush]

ASME STS-1 has some design examples in Appendix E that may be helpful.

 

[KiwiMace]

The stacks are double-wall. The inner near the machine exhaust might be 650deg but the outer wall can be held to with 50-150degF above ambient with varying levels of double wall insulation.

However, for an engine exhaust you should be providing an expansion joint at the exhaust connection.

Try Selkirk IPS for example.

 

[chicopee]

It's too bad that you could not redirect the exhaust to a steam or hot water generator.

 

[StructTaco]

Chicopee: Unfortunately not that green/LEED certified. They generators will only be used temporarily while power lines are brought in, then they will become back-up only.

fegenbush: I downloaded the ASME document you mentioned, this has been very helpful, thanks. It addresses all the applicable design aspects that I need (structural, including temperature and linings/coatings and single vs. double wall), plus a lot more things for the plume/ventilation/exhaust/mechanical experts.