We supported the Porirua Wastewater Treatment Tank project, supplying PE gravity wastewater pipe and manholes using our proprietary EF welded socket system.  The project required careful planning thanks to challenging ground conditions – hillside runoff to the east, coastal groundwater to the west, and a high water table throughout the site.

To ensure the pipeline and manholes remained secure, the design incorporated detailed flotation calculations, trench-strengthening improvements and approval of an SN16 pipe structure capable of meeting both HNHO72 load and seismic uplift requirements.

Supply included in-house training for the team ahead of installation, followed by trench-side support once pipe arrived on site. The project featured high-vis yellow internal spiral PKS pipe from DN800 to DN1500, including around 400m of DN1200, along with 24 PE manholes up to DN2500. Concrete ballast bases and on-site benching ensured stability across the network.

Welding support spanned more than 15 days, covering spool fabrication, flow meter brackets, flange transitions and multiple connection types into manholes, structures and weirs. Technical oversight included PS1 and CM checks, third-party engineering review, and peer review.