Poly Pipe Size Calculator
South West Tech — friction loss & velocity for rural poly runs
— recommended
| Poly (PN12.5) | Velocity m/s | Friction m/100m | Loss over run | OK? |
|---|
Friction from Hazen-Williams (C=150 for PE). Add fittings allowance (~10%) and static lift to get total pump head. Green = passes both limits; purple = our pick.
Guide only — based on metric PE100 PN12.5 internal diameters; rural B-class poly differs slightly. For pump + pipe + storage design as a package, talk to South West Tech — 0488 224 284.