A round gas duct tee is needed to connect a round pipe branch of a gas duct (or vent pipe) to the main round duct of the gas duct (or vent pipe).

    Tees must comply with standards and can be of two types:
  • 1) the diameter of the branch is less than the diameter of the header;
  • 2) the diameter of the branch is equal to the diameter of the header;

When designing non-standards large diameter tees, it is necessary to calculate the trajectory along which the junction between the duct branch and the duct header will pass. The developed lateral surface (trajectory) is cut out on a steel sheet, and then the sheet is rolled into a round pipe. The resulting duct branch is attached to the round duct and welded.

The program on this page of the site will computate the lateral surface of the branch of the straight equal round tee. The diameter of the branch (fitting) of the tee is less than the diameter of the main line (header) of the tee.

Unrolled lateral surface of branch of straight vent tee.
It is cut out on sheet metal with further circular rolling.

air duct tee
Inner diameter (d) of tee branch
mm
Outer diameter (D) of tee header
mm
Branch wall thickness (s)
mm
Number (n) of split points of surface
point
You can download a free program for working with files with the .dxf extension   here
You can download the DWGTrueView thumbnail viewer   here