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Gravity systems

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Gravity systems

 

Self-unloading gravity system for continuous and efficient discharge of coarse bulk materials

 
 

 A bulk carrier equipped with a MacGregor gravity self-unloading system offers fast, efficient and environmentally friendly discharge of coarse bulk materials. The system can operate 24-hours a day and seven days a week. Discharge capacities normally vary between 1,000 t/h and 6,000 t/h, and can be higher if required.

The gravity self-unloading system can be designed for full integration into newbuild vessels or for easy installation onto existing vessels. Each delivery is tailor-made to suit the customer’s specific requirements in terms of ship size and capacities for maximum performance and efficiency. To date, the system has been supplied to ships ranging in size from 3, 500 dwt to 135,000 dwt.

Key benefits

  • Well-proven technology
  • High discharge capacity
  • Applicable for newbuildings as well as conversions
  • Tailored to suit each vessel for maximum performance
  • Environmentally-friendly operation
  • Low power consumption
  • Low operating costs

MacGregor continues to refine and improve this concept and recent major advances are represented by a new full flow gate for greater cargo capacity, increased discharge rates while minimising material flow disruptions, and a new totally enclosed boom that provides truly dust-free operations.

Virtually any free-flowing dry bulk commodity can be handled, for example coal, iron ore, gypsum rock, aggregates and many others.

 

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.

Environmentally-friendly operation

 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. New boom EBC-110426-8_400x173px.jpg
The conveyor technology also ensures the lowest possible power consumption, saving money and reducing emissions due to a reduced need for power generation. 

 

 

Recent major advances are represented by a new full flow gate for greater cargo capacity, increased discharge rates while minimising material flow disruptions, and a new totally enclosed boom that provides truly dust-free operations.

New gate_FFG-110426-6_220x134px.jpg
 

 

 

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