Regional pipelines
The regional pipelines consist of rising main component varying from 150mm to 800mm diameter rising mains that link the five pump stations, to the treatment, the biosolids pipeline, and the 1,200 diameter outfall pipeline and two diffuser pipelines.
| Main Type | Length - km | Base Service Life (years) | Residual Life (years) at 2017 |
|---|---|---|---|
| PE | 12.29 | 80 | 46 - 72 |
| Concrete | 2.55 | 80 | 46 |
| Steel | 1.97 | 80 | 46-59 |
| 16.81 | |||
