Sewer relining has been used to transform 1.35 m diameter pipes running beneath the southern runway approach to Wellington Airport.
The large sewer pipes were seriously corroded and full replacement would have proven expensive and difficult, as the airport is in constant use. Engineers therefore chose the trenchless method of spiral wound lining, with narrow PVC wound into the pipe by an automated crawler.
The work, managed by the Council’s infrastructure services company Capacity, is estimated to have saved the city $NZ989,000 over alternative replacement options.