Rotork Australia will supply six subsea rack and pinion units for use in the patented CETO (Carnegie Wave Energy) technology.
A wave-energy technology that converts ocean swells into renewable power and desalinated fresh water, CETO sits fully submerged beneath the ocean surface and consists of a buoy, which moves with the ocean's waves. The up and down movement of the buoy drives a pump attached to the sea floor, delivering high pressure water through a pipe back ashore; once onshore the high pressure water is used to drive a hydroelectric turbine.
Rotork's subsea rack and pinion units are compact double-acting hydraulic actuators complete with a diver operated override gearbox on top of the actuator. The override can be operated in the event of an emergency as the depth is only 25 metres.
Built and supplied by Rotork's Gears division, the override gearbox has a ‘lost quadrant’ system in the gear pinion – a simple, but highly effective selection mechanism switching between hydraulic and manual operation. All the diver has to do is rotate the handwheel to the three positions: remote (hydraulic) or open/close the valve (manual), visible through the indicator on top of the gear.
Rotork Fluid Systems and Rotork Gears have collaborated to provide a rugged, compact and highly engineered solution in a cost effective package.