A bulk carrier fitted with a MacGregor cement handling system has all the necessary equipment onboard to undertake fast and efficient operations. Since cement is loaded at very high loading rates, up to 1600 t/h, strict demands are made on the ballast system to keep the ship in a level and stable condition. By using the MacGregor horizontal screw conveyor and a fully automatic regulated distribution arrangement to the holds, the cement is distributed to the holds evenly both FWD/FT and STB. This enables a safe and efficient loading operation of the ship and at the same time simplifies the ballasting.
Animation: Mechanical loading of cement carrier
Discharge is provided by reclaiming cement with the use of fluidised bottoms installed on the tanktop in each of the vessel’s cargo holds. The traditional way is to operate each panel manually. However, to ensure the highest possible through-ship-capacity with the shortest turnaround time for the ship in port, Cargotec has chosen an automatic unloading operation based on a PLC-program.
For elevating the cement above deck, the well-proven MacGregor vertical screw conveyor is used. This ensures a high-capacity discharge operation and reduces energy consumption considerably.
Pneumatic unloading to shore
The most common way of transporting cement from ship to silo is by pneumatic transport in pipelines. Pneumatic transportation requires minimal shore-side installations as all the transportation equipment is situated onboard the ship. The MacGregor blow pump solution is an efficient pneumatic transport system that can be optimised for various capacities and transport material over considerable distances with the lowest possible power consumption.
Animation: Pneumatic unloading
Mechanical unloading to shore
Some cement terminals are built only for mechanical transportation to silos, which is why some cement carriers, equipped by MacGregor, are also fitted with a MacGregor slewable and luffable screw-type discharge boom. The boom is linked to the shore facilities by flexible bellows and can reach a mechanical discharge rate of up to 1,300t/h. The boom can also be used for loading directly to road tankers.
Animation: Mechanical unloading
MacGregor offers combined mechanical and pneumatic discharge systems, which are beneficial as it makes the ship versatile. The mechanical element can be installed either during the building phase or later on.
MacGregor electrical control system
Cement carriers equipped with a MacGregor cement handling system incorporate a sophisticated electrical control system for the supervision and control of different loading and unloading operations. It is built for automatic operation by one man only. It can handle different grades of cement for loading and unloading the ship at high capacities in the most efficient way. In addition, the system is built for remote diagnostics via a modem to MacGregor engineers.