Middleback is a non-propelled self-unloading barge (SUB) that is paired with the floating-offshore transfer barge (FOTB) Spencer Gulf. The barge unloads through a single continuous hopper-shaped hold fitted with a longitudinal conveyor belt and unloading boom. This vessel currently operates on the Australian Coast.
SUB Middleback is wholly owned and operated by CSL.
Download specs| Technical specifications | |
| Classification | LR Barge. Self-unloading. Emergency anchor equipment. Maximum 2.2 m significant wave height service extended protected water service from Whyalla. |
| Year Built | 2006 |
| Deadweight | 12,877.24 tonnes |
| Length Overall | 118.00 metres |
| Breadth moulded | 27.00 metres |
| Depth Moulded | 7.50 metres |
| Draft | 5.61 metres |
| Length of Boom | 22.87 metres |
| Total Hold Capacity (including hatches) | 5,426 cubic metres |
| Discharge Rate (maximum) | 5,000 tonnes/hour |
