Radiant Section

Cylindrical Radiant Section

Cylindrical Radiant Section


The radiant section in a vertical tube, cylindrical fired heater contains tubes in a vertical position. The tubes may be along the refractory wall, as in a circular pattern, or they may be exposed to the radiating flame from both sides, as in a cross or octagonal pattern.

Circular Tube Pattern: Cross Tube Pattern: Octagonal Tube Pattern:
Circular Pattern Cross Pattern Octagonal Pattern

Vertical Tube Box Radiant Section

Vertical Tube, Box Radiant Section

Single And Multiple Cell Radiant Section

The radiant section in a vertical tube, box type fired heater contains tubes in a vertical position. The tubes may be along the refractory wall, or they may be located along the centerline of the box receiving radiant heat on both sides, or they may be located in both positions.

Single Sided Firing Only: Double Sided Firing only: Mixed Firing:
Wall Pattern Center Pattern Mixed Pattern

Other Tube Coil Designs

Hoop Coil Radiant Section

Hoop(or Hairpin) Coil Radiant Section


The radiant section has vertical tube coils in a hoop or hairpin design. The tubes may be as shown with the headers at the bottom, or they may be reversed with the headers at the top. The more common design is as shown with the burners down the centerline of the box, firing vertically. This design is used where the pressure drop must be very low since the path through each tube provides a design with many passes.