Shipyard De Hoop has recently conducted sea trails on the first hybrid propelled Fast Supply Intervention Vessel (FSIV).
The full-displacement De Hoop design maintains its speed whatever the draught or cargo weight. The fact that the vessel has two propellers, instead of three or four (smaller) propellers, also contributes to the vessel’s speed keeping and its efficiency due to the relatively large blade area in relation to resistance-increasing appendages under water.
Low Fuel Consumption
The FSIV2000 is developed for the combined transport of deck cargo and passengers to offshore oil fields. Optionally, the yard also offers a variety of below-decks tank configurations for the transport of liquid cargo. The 55 x 9 metre FSIV is constructed primarily for low fuel consumption has deadweight capacities from 200 up to 400 tons. The vessel is powered by a hybrid diesel-direct/diesel-electric system.
At low speed and during manoeuvring, only the portside diesel engine will be used to drive a generator. The generator, in turn, delivers power, via a DC-bus switchboard, to the two electric motors that drive the propeller shafts through the gearboxes. The maximum speed in diesel-electric mode is 13 knots. To obtain this speed, 410 kW of power is required, which is reflected in a fuel consumption of less than 150 liters/hour at 13 knots.
At higher speed, both Caterpillar 3516 diesel engines will engage with the gearboxes to provide up to 2350 kW at 1800 rpm each, directly to the two propellers. In diesel-direct mode, the two fixed pitch ducted propellers are capable of producing up to 3.7 mW with 200 metric tons payload in total, achieving a maximum speed of 21.3 knots with these particular propellers. De Hoop also offers a configuration with “fast” (high rpm) propellers, providing a maximum speed of over 25 knots. In this configuration, the gain in speed, however, will slightly decrease the “speed keeping”-aspect.
Cargo Deck
Even at a speed of 20 knots the accelerations remain well within the comfort levels, while the extended flaired upper bowlines reduce the amount of green water and make for a dryer ship. The 200 square metres cargo deck aft is well protected by the forward superstructure, high freeboard and side funnels, guaranteeing a safe passage for the 200 tons deck mounted cargo.
A second cargo deck of 40 square meters is located in front of the accommodation, which is protected to a certain extend by the high bulwarks/coaming construction and two strong longitudinal tubes between the structure and the bow. Fittings and lashing to sea fastening one 20 feet container are provided.
Hull Vane
Further fuel savings are achieved by applying a bulbous bow and the (optional) Hull Vane. The Hull Vane, developed by Van Oossanen Naval Architects, consists of a fixed foil positioned below the hull behind the rudder(s), fitted by means of struts. For this FSIV a further reduction in power consumption, ranging from 11% to 15% depending on the speed, can be achieved.
Basically having a DP1 notation, which can be upgraded to DP2. The lightweight steel construction is built according Germanischer Lloyd’s High Speed Craft (HSC) rules.
Principal Particulars
- Length, over all: 55.17 m
- Length, between perpendicular: 49.81 m
- Length, waterline (2.50m): 50.51 m
- Beam, moulded: 9.00 m
- Depth, moulded: 4.50 m
- Draught, design: 3.10 m
- Deadweight: 210 t
- Speed, trail: 21.3 kts
- Working deck space: 200 m2
- Complement: 100 passengers, 8 crew (in 4 double berth cabins)
- Fuel capacity: 40 cu.m, to be increase to 200 cu.m as an option
- Freshwater capacity: 5 cu.m
- Propulsion plant: Hybrid Diesel-Electric/Diesel-Direct Propulsion
- Main power generators: 2x Caterpillar 3516
- Classification: Built to Germanischer Lloyd’s rules for worldwide
