Lateral Displacement between two pipes to be joined cannot be accommodated by a single coupling. Two couplings must be used, and a small centre piece of pipe may be allowed to articulate the take up displacement.
Method of calculating length of the centre pipe.
| PIPE NOMINAL DIAMETER (mm) | MINIMUM LENGTH (mm) |
|---|---|
| ≤ 457mm OD | Displacement Y x 10 |
| > 457mm up to & including 610mm OD | Displacement Y x 12 |
| > 610mm up to & including 762mm OD | Displacement Y x 15 |
| > 762mm up to & including 1219mm OD | Displacement Y x 20 |
| > 1219mm up to & including 1829mm OD | Displacement Y x 30 |
| > 1829mm OD | Displacement Y x 60 |
EXAMPLE
Pipe OD = 762mm
Lateral displacement to be accommodated =
180mm
Minimum closing length = 180 x 15 =
2700mm
N.B. For KLAMFLEX Flange Adaptors, these lengths must be doubled.
