2024
Mangere, Auckland
Approximately 75% of Auckland’s wastewater flows to the Mangere Waste Water Treatment Plant, the largest facility in the country.
Construction of the original plant—then known as the Manukau Sewage Purification Works—started in 1956, with the plant opening in 1960. Since then, it has undergone a number of upgrades to modernize and increase capacity.
Project Requirements
A new protective coating was required in the vapour zone of the primary sedimentary tanks (PST) to protect the reinforced concrete against biogenic corrosion. In addition to the concrete protection, repairs first needed to be carried out in areas where concrete had spalled in the tanks.
Challenges
- The sedimentary tanks had to be shut down and emptied for work to be carried out.
- Access to tanks was challenging as the repair materialshad to be craned into the tanks.
- Strict site controls were in place due to working inconfined spaces and general on-site hazards.
Sika Solution
Sikagard®-62 protective epoxy coating was used to protect the vapour zone. It is highly chemical resistant and is ideal for linings in storage tanks and silos.
Sika Products
Project Participants
Product Specifier:
McConnell Dowell
Main Contractor:
McConnell Dowell
Specialist Contractor:
Maxbuild Limited