180° Bend flat pattern
What it is
The 180 degree segmented bend — the full return. Same construction as the segmented bend with the angle locked: the tube leaves in the direction opposite to the one it entered, around the radius you give.
Where it is used
Returns in coils, plate-built heat exchangers, ducting that must double back within a short run.
Measurements the calculation needs
- H Height
- D Diameter
- ANG Angle
- S Sections
- DV Divisions
- THK Thickness
Worked example
The values the form comes pre-filled with, run through the tool itself:
| Height | 1200 mm |
|---|---|
| Diameter | 800 mm |
| Angle | 180 mm |
| Sections | 5 mm |
| Divisions | 16 mm |
| Thickness | 10 mm |
| The flat pattern fits a plate of | 2482 × 518 mm |
| Flat patterns produced | 2 |
Frequently asked questions
- How many gores does a 180 degree return need?
- Since the angle is twice that of a 90 degree bend, the gore count usually doubles to keep the same finish. Five to seven is the usual range.
- Where is the radius measured from?
- From the centre of the bend to the tube axis, as in the other segmented bends.
