Offshore Handling of Dry Bulk Cargo

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Bedeschi S.p.A.

FC Princesse Chloe Floating Transfer Unit

The Princess Chloe is a floating transfer unit – in operation in Indonesia since December 2010 – equipped with two heavy duty Liebherr offshore cranes of four rope type with 30 tonnes capacity each. They have been fitted with Peiner Smag grabs of 20.5 m³ capacity. The cranes are strategically placed in a way with respect to the hoppers so as to minimise the slewing movement, thereby increasing the cycle time and efficiency.

The cargo handling system supplied by Bedeschi consists of two hoppers and an array of conveyor systems leading to a telescopic/shuttle ship loader. The hoppers are of 50 m³ volume with a top opening sufficient to accommodate the footprint of the large grabs in use. The trunk-pyramidal shaped hoppers have asymmetrical walls to ensure smooth flow of coal through the hoppers into the transfer chute. The hoppers are fitted with vibrators to ensure free flow of sticky coal, in order to maintain the required flow rate. The top of the hoppers are fitted with mesh grill to eliminate any over size or undesirable material which may potentially damage or block the conveyor system. The water sprinkler system is installed on top of the hoppers to suppress the coal dust during grab delivery.

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Coal from each of the hoppers is extracted by means of individual variable speed belt feeders. These frequency controlled feeders extract coal from the hoppers and transfer it to the longitudinal conveyor. Another conveyor then transports the coal longitudinally through the length of the floating terminal through to a transfer point on to a transverse conveyor which will help in crossing over the entire beam of the terminal and be led to the final conveyor leading to the ship loader. The inclinations of all the conveyors have been designed in accordance to the grade of coal to be handled in order to achieve smooth flow of cargo and avoid back flow. Special care is taken in design of the transfer points to ensure no blockage occurs and the material flows smoothly. All the conveyors are enclosed to avoid air borne pollution.

The ship loader is of shuttle/telescopic boom type and has 19 m air draft which makes the Princess Chloe capable of loading large vessels up to cape size. The ship loader is capable of swiveling by means of geared slewing rings and luffing by means of hydraulic mechanism. The cargo handling equipment constructed and supplied by Bedeschi is manufactured with the highest classification for heavy duty work for open sea conditions.

The cargo transfer takes places when the floating terminal is safely moored alongside the ocean going vessel with barges, transporting the coal from the mine head, alongside. The cranes transfer the coal form the barges into the hoppers, which then gets transported though the conveyor system and the delivery ship-loader to the ocean going vessel’s holds at an average guaranteed daily rate of 40 000 tonnes. The swiveling capability of the ship-loader ensures serving multiple holds of the ocean going vessels without the need of shifting the Princess Chloe alongside. The luffing mechanism of the ship-loader is used to cater to the difference in the air draft of the ocean going vessel at ballast to fully laden condition.

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