10 OTECO 9000 Type General Cargo Vessels for Briese – Heavy Lift News
26 Apr 2022

10 OTECO 9000 Type General Cargo Vessels for Briese

As part of the new building program for Briese Schiffahrts GmbH & Co. KG, based in Leer, Germany, 10 “OTECO 9000” type general cargo vessels are currently being built in China at the Dayang Offshore shipyard.


the OTECO 5000 vessel, “MV Monika”


OTECO stands for “Open-Top Eco Generation” and the current newbuildings are a further development of the OTECO 5000 vessels in their fleet, like “MV Monika” and her sisters.

The newbuilding project was developed by Briese newbuilding team. Usually, when a newbuilding contract has been signed between a shipowner and building yard, a total building price will be agreed and nearly all negotiations with the suppliers of machinery and equipment are being done by the shipyard.

For this project about one third of the total contract price comprises a package which includes the delivery of equipment to the yard. All technical and commercial matters have been agreed between Briese and the suppliers, also including preparation of approval drawings. By doing so the newbuilding team of Briese have full control about all details and can make flexible decisions, always having in mind to get the best possible vessel.

The OTECO 9000 is 132,8m long and 18,85m wide, with a smaller beam of only 17,6m at the waterline. The superstructure is arranged on the foreship, therefore the full open deck area of more than 2000m² can be used for stowage of deck cargo.

The very large cargo hold with a length of about 85m in the lower hold and 97,4m in the upper hold can be divided flexible in several compartments by using tween deck panels and/or grain bulkheads.


Model test calm water


The vessel can sail with open hatches and has been tested in a model test tank with a severe sea state at MARIN ship model test institute the Netherlands. Experience from the previous development of the OTECO 5000 have been taken into account to optimize some hull shape details, mainly at the aft- and midship, to decrease the amount of overcoming water in waves.


Model test in waves


The basic design and class approval documents have been made by Dutch engineering office Groot Ship Design (GSD). Both GSD and MARIN were also involved in the hull shape optimization for best vessel performance and lowest fuel consumption. A large number of hull form variants have been tested and compared by the use of Computational Fluid Dynamic (CFD) calculations. The propeller is arranged within a nozzle for further optimization of the free sailing thrust. For the connection of the nozzle to the hull several variants (small vs. large headbox) have been investigated by CFD calculation as well and the final hull form has also been tested in calm water in a ship model test basin of MARIN.

Even the rudder is not a standard shape but with slightly twisted shape for improved performance.

On the optimization design draught and with ECO speed of 11,5kn the vessel can carry a deadweight of about 5050t and will have a fuel consumption of about 6t/day. On maximum draught with 11,5kn the deadweight is about 9050t and fuel consumption only about 7.5t/day.

Source Briese Schiffahrts GmbH & Co. KG    


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