A vessel fitted with a MacGregor gravity self-unloading system has all the necessary equipment onboard to undertake a fast and efficient unloading operation. From the ship’s cargo holds, which in most cases are of a W-shape configuration, gravity discharge is provided through a number of hydraulically-operated gates located in the bottom of the holds. The gates feed material onto conveyor belts that run below the cargo holds for further transport to an elevating system that lifts the cargo to deck level. Deck conveyors deliver the material to a hoistable and slewable boom conveyor for discharge to receiving facilities ashore.
Animation: MacGregor C-conveyor elevating system
The conveyor system is operated either manually or fully automatically from a control room located on A-deck in the ship’s superstructure.
A MacGregor gravity self-unloading system ensures a dust-free vessel discharge process. The vessel can be unloaded with the hatch covers closed during the entire operation. The deck conveyors that feed material from the vessel to the shore can be equipped with conveyor covers, water spray nozzles and dust collectors at loading points.
In addition, the new enclosed boom reduces spillage and dust emissions to an absolute minimum. This ensures a dust-free operation for the crew onboard and the stevedores ashore, as well as having minimal environmental impact on the surrounding area.
The conveyor technology also ensures the lowest possible power consumption, saving money and reducing emissions due to a reduced need for power generation.