Hydraulic and Pneumatic in conjunction with Plant Performance Group used one of the world’s most advanced heavy lifting systems, the PLC controlled Enerpac Synchronised Lifting System, to enhance precision and safety while monitoring the 2200-ton load’s centre of gravity during the lift on Dredger 16 at Loy Yang Power.

Dredger 16 is longer than the MCG (200 metres), as high as a 16-storey building (55 metres) and has a slew ring bearing 15.2 metres in diameter containing 177 balls of 200mm diameter each weighing 32kg. It weighs a total of more than 5.000 tons and can remove 60.000 tons of overburden a day.

The task involved two-stage lifting and lowering over 250mm, with the Enerpac Synchronous system governing six 630 ton hydraulic cylinders used in pairs at three lift points.

In addition to being precise and providing the centre-of-gravity accuracy needed, the technology had to be able to function flawlessly in a harsh environment, with coal dust blowing around the power unit.

The lift proceeded smoothly, with the hoisting being undertaken on May 7 and lowering on May 13. The huge task was facilitated by the accuracy and fluency of the synchronous lift operation, and the real-time centre of gravity display.

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