Torishima to supply pumps for Waterise’s subsea desalination systems

Torishima Pump Mfg Co Ltd has entered into a collaboration agreement with Norway’s Waterise to provide the main pumping equipment for its subsea desalination plants.

Waterise will design, install and operate subsea reverse osmosis (RO) desalination plants, which use hydrostatic pressure to push seawater through membranes creating permeate water. This will be pumped to the shore by the Torishima pumps from the Waterise subsea desalination module.

The Waterise system offers a 40% reduction on specific energy consumption (SEC) and requires 80% less land compared with conventional terrestrial RO plants. As the system is located at 500m sea depth the water entering the membranes is considerably cleaner and is a constant temperature, so it does not require the high levels of chemical treatment necessary on conventional plants.

“The key thing about the Waterise system is they are utilizing proven RO technology, there is nothing new about the process, it’s just installed subsea,” said Gerry Ashe, Torishima’s deputy CEO.

“I’m very pleased to announce Torishima as a supplier and pump expertise partner to Waterise. Torishima is one of the most renowned pump suppliers, and I believe the cultural fit and common views on collaboration paves the way for a strong long-term mutually beneficial relationship,” said Niels Petter Wright, CEO of Waterise.