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Encyclopedia of Marine and Energy Technology

Self-unloading system of the HAI WANG XING


According to The Motor Ship September 1995

The self-unloading collier HAI WANG XING was built by Bremer Vulkan Verft, Germany, in 1995. Cargo is carried in five holds within a double-hull. The hold bottom is W-shaped, forming slopping hoppers above the two hold conveyors.

The cargo handling equipment consists of 6 conveyor belts. Unloading is accomplished via gravity through hydraulically-operated gates fitted to outlet hoppers in the bottom of each hold, releasing cargo onto two 169m long longitudinal conveyors. Each of them has a maximum capacity of 1750 tonnes/hr; the belt has a width of 2m and runs at a speed of 2.6 m/sec. These transport the cargo aft and incline up through the engine room area. There, it is transferred to two cross conveyors in the stern of the vessel. These have a belt width of 1.8m, a length of 6.6m and lift the cargo 1.4m at a speed of 2.1 m/ sec. The cargo is then transferred to a single 36.6m-long centre-line inclined conveyor. It takes the cargo 10.8m upwards through the accommodation block at a speed of 3.8 m/sec out to the weather deck. Cargo is finally discharged ashore via a boom-conveyor, able to be slewed and hoisted, at a rate of about 3500 tonnes/hr. The boom-conveyor is 76.2m long, with a belt width of 1.8m and speed of 4.1 m/sec.

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