Duct metal thickness
Duct metal thickness
(OP)
I will be installing a large burner on an asphalt plant which requires a duct to be installed between fan outlet and burner. There will be two straight sections of duct in and out of an "Air distribution box" or plennum which will be situated below the burner. So the inlet horizontal duct will be about 1500mm long and 500 x 620 cross section. The outlet vertical duct from the "box" to the burner is about 700mm long and 720 x 720 cross section.Both ducts will be rigidly flanged to the box but connected by flexible expansion joints to both fan and burner.
What I would like to know is what would be the minimum thickness/ gauge of steel sheetmetal recommended to be rigid enough so as no "panting" or "oil canning" and associated noise will occur. The pressure in the duct will be say 4 kPa and the max air flowrate at 20,000 cubic metres/ hr. Minimum about 4,000.
Thanks in advance,
Rod.
What I would like to know is what would be the minimum thickness/ gauge of steel sheetmetal recommended to be rigid enough so as no "panting" or "oil canning" and associated noise will occur. The pressure in the duct will be say 4 kPa and the max air flowrate at 20,000 cubic metres/ hr. Minimum about 4,000.
Thanks in advance,
Rod.
Rod Nissen.
Combustion & Engineering Diagnostics





RE: Duct metal thickness
RE: Duct metal thickness
Inlet duct 60" long and 20" x 25"
Outlet duct 28" long and 28" x 28".
Air distribution box 45" x 45" x 28" high.
Pressure in duct 0.6 psi
Rate 11,770 cfm max minimum 2354 cfm.
Rod Nissen.
Combustion & Engineering Diagnostics
RE: Duct metal thickness
Table of contents:
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RE: Duct metal thickness
RE: Duct metal thickness
I do however think (respectfully)that 20gauge is a mite too small.
Rod Nissen.
Combustion & Engineering Diagnostics
RE: Duct metal thickness
However, like I said 18ga. cross-broken should be fine.
RE: Duct metal thickness
Rod Nissen.
Combustion & Engineering Diagnostics
RE: Duct metal thickness
jrr