Subtech Group subcontracted for desalination plant at Monwabisi
As of the 18th of December, Cape Town’s dam storage levels were at 33%, with useable water at 23%. At the current rate of consumption (611 million litres of water per day), Day Zero has been moved forward to 18th May 2018 – a reality most Capetonians are aware of. Cape Town mayor Patricia de Lille has announced a three-phase disaster plan, while assuring residents that there is a strategy in place to ensure that the city never reaches phase two and three. Part of this strategy is to have two desalination plants, one at Monwabisi and the other at Strandfontein, come online in early 2018. To ensure that these plants are operational by February 2018 Proxa has subcontracted the Subtech Group for the design and installation of the intake structure, outfall and extraction pipelines for their desalination plant.
The Subtech Group is a proudly South African grown company with an operational base and executive presence in the Western Cape. Subtech’s management and operational teams are experienced in subsea construction and engineering and have completed various pipeline and cable installations along the West and East coasts of South Africa – some in the most challenging conditions! Proxa, established in 1986, is a specialised water solutions provider in the commercial, industrial and municipal sectors. They have a wide range of services that cover the entire water cycle and are known for their custom-tailored, cost-effective solutions.
Desalination Plant Marine Works
The design of the intake structure, outfall and extraction pipelines has been managed by Subtech’s experienced engineering department and have been designed to withstand a 20-year storm event. Before the construction and installation of the pipeline could begin, the Subtech Survey Division carried out extensive multi-beam bathymetric survey along the proposed site. The survey was interrogated to identify the optimum route for the pipeline to be laid and for the intakes to be positioned.
The fabrication of the pipeline is currently being carried out at Gordon’s Bay Harbour and, when completed, will be towed to Proxa’s desalination site at Monwabisi. Once the pipeline has been instated and the desalination plant is fully operational, it will be capable of producing seven million litres of fresh water per day!
We would like to thank Gordon’s Bay Harbour for their assistance and use of their facilities, as well as Proxa and the City of Cape Town for entrusting Subtech with this critical task.