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FLUE GASES DUCTS: ROUND vs RECTANGULAR

FLUE GASES DUCTS: ROUND vs RECTANGULAR

FLUE GASES DUCTS: ROUND vs RECTANGULAR

(OP)
Hello,

Where can I find guidelines or can someone advise on the issue of the duct shape, in our case the cross section of the required duct is 3.25 sq.meter.

regards,
roker


RE: FLUE GASES DUCTS: ROUND vs RECTANGULAR

Square or rectangular duct uses more material per unit length.  By the time you're finished reinforcing it, a _lot_ more material.  

In a rectangular duct, it's slightly easier to fabricate a short radius bend ... not that a short radius is a good idea.

I wonder if anyone made flues rectangular before the appearance of baghouses, which tend to be rectangular for more defensible reasons.  

Transitions, e.g. from rectangular baghouse apertures to round ducts, are a little harder to manufacture than simple joints.  They're harder to draw, too, which may be the real reason rectangular flue ducts first appeared.

Mike Halloran
Pembroke Pines, FL, USA

RE: FLUE GASES DUCTS: ROUND vs RECTANGULAR

For design of a rectangular duct use ASME, Section 8,Div.1, Appendix 13. The rectangular duct will need reinforcing depending on the pressure.

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