Changes in the Shipping Industry Through Improved Technology (continued)

This innovative material handling system was chosen after consideration of the abrasive nature of the fine grain alumina cargo, the economical use of space, low energy consumption, high discharge rate and low relative maintenance compared to alternative methods.

Particular requirements of Electrolytic Zinc Pty. Ltd., to carry zinc concentrate from Port Pirie in South Australia and Burnie in Northern Tasmania to their zinc refinery located at Risdon in Southern Tasmania, plus the transport of zinc ingots from Risdon to the mainland ports, presented a unique multi role shipping problem.

The vessel developed to undertake this task was Zincmaster which combined bulk carrying capacity for concentrate, together with roll on roll off facilities for zinc ingots using a low ramp. Due to the physical separation of the roll on roll off operation from the ore handling activity, unloading of concentrate by wharf cranes equipped with grabs, is undertaken simultaneously with loading of bundled ingots by heavy fork lifts.

This simultaneous discharge and loading capability significantly reduced port time compared to previous practice. A later requirement was that Zincmaster should have the capability of carrying 5000 tons of concentrated sulphuric acid, and so a 20 metre mid-body section containing the new acid tanks, pumprooms and auxiliaries were added. These modifications made this 15,000 ton dw vessel a very versatile, multi role carrier.

Australian Academy of Technological Sciences and Engineering