The offloading of high density bulk goods at high throughputs is the classical economic domain of grab-type ship unloaders. The majority of applications call for gantry-type cranes. thyssenkrupp gantry grab unloaders are in operation worldwide with throughputs as much as 5,100 t/h in ore and 4,200 t/h in coal, with grab payloads of up to 85 tons.
Slewing and luffing cranes are frequently employed for smaller capacities. They are indispensable when material types and feed points vary greatly and a high level of flexibility is required.