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)|
|Up to 457 OD||Displacement Y x 10|
|Over 457 to 610 OD||Displacement Y x 12|
|Over 610 to 762 OD||Displacement Y x 15|
|Over 762 to 1219 OD||Displacement Y x 20|
|Over 1219 to 1829 OD||Displacement Y x 30|
|Over 1829 OD||Displacement Y x 60|
Lateral displacement to be accommodated = 180mm
Minimum closing length = 180 x 15 = 2700mm
N.B. For KLAMFLEX Flange Adaptors these lengths must be doubled.