In-depth | SHIP DESIGN
DNV expands its eco range of concept designs
Meeting the demands of stringent green regulations both now and in the future may seem daunting for some ship owners, but Norwegian class society DNV hopes that its recent additions to its environmentally friendly designs will be able to smooth the transition.
has introduced a further two vessel designs for an open hatch bulk carrier, which has been developed along with Oshima Shipbuilding Co., Ltd and an ore carrier developed on the same principles that will also have reduced fuel consumption and be more energy efficient. “Te concepts are not a tool to sell devices,
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but to help ship owners who need some guidance about making ships more efficient. We are helping to paint a more realistic picture for the ship owner”, commented Michael Aasland, business director – bulk carriers, DNV. DNV has highlighted that the concepts
that they are presenting to ship owners are a platform of innovative ideas. Mr Aasland notes that whilst developing these concepts DNV had interesting conversations with ship owners about what features they would need to look into and which features they should not. Te open hatch bulk carrier designed for
Oshima has been designed for trade between Brazil and China and it is expected that it will have a constant flow of cargo to carry, because of this it is expected that this type of vessel will seldom sail in pureballast claim DNV due to
TECHNICAL PARTICULARS Ecore
Length oa .............................................330m Length bp .............................................324m Breadth ...................................................70m Depth ......................................................28m Draught loaded .....................................18m Draught ballast ........................................7m Block coefficient loaded ...................... 0,68 Block coeffienct ballast ........................ 0,63 Deadweight ...............................250,000dwt Service speed loaded ................. 14,9knots
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NV launched its concept for an environmentally friendly container ship last year, now a year on DNV
DNV and Oshima Shipbuilding partner up to create the latest concept for a bulk carrier.
the type of route and cargo that this type of vessel will be transporting. “It is believed the vessel once dropping off its initial cargo will have a return cargo to transport”, highlights Mr Aasland. One particular point of interest with this
vessel is that it will have an air lubrication system installed. We have already seen Oshima incorporate an air lubrication system onboard Yamati, which was delivered last year (See Significant Ships 2010 – pg110). The system that will be installed on this latest concept is still under development by Oshima and DNV. DNV has said the unit has been supplied by Oshima and with input both from Oshima and DNV the system is being developed further. Mr Aasland has highlighted that this system is beneficial to the design of vessel as, “Te vessel is wider than a standard open hatch bulk carrier and is shallower, having a larger surface area for the air bubbles to press against.” The vessel has been designed to run
on Liquefied natural gas (LNG) with the propulsion machinery being designed by Rolls-Royce. The design also features Rolls-Royce Promas controllable pitch propellers and rudder. Te vessel features one auxiliary engine that can be used either as a generator or an additional propulsor. Along with this the vessel also has hydraulic gib cranes that have a larger capacity, meaning that there is less cranes onboard. Te hatch covers are also made from composite materials,
which DNV are working with Kockums to develop. Further, DNV has also introduced its latest
concept for a ore carrier Ecore, for trade along the China to Australia route that will have the same energy efficiency enhancements as the open hatch bulk carrier. Once again the design incorporates technology that aims to reduce fuel consumption, reduce ballast and to reduce steel cost. Te design features a V shaped hull with
a wider beam and transverse bulkhead, twin propulsion and one centre cargo hold that is fitted with a self loading system, designed by MacGregor. To make sure that the loading of the vessel is done safely a loading monitoring system has been added. Te vessel will be powered by LNG and to
save space the LNG tanks have been placed in the wing sections of the vessel, so not to disturb the cargo space. Te tanks would be IMO type C tanks and to further enhance and reduce delays DNV has foreseen that this type of vessel could also be refuelled by bunkering barges. DNV has highlighted that on the EEDI
scale this vessel would be 22% lower on the scale than a standard ore carrier. Te vessel would be powered by a 2 stroke engine and would be able to fulfil the International Maritime Organization (IMO) Tier II and Tier III requirements for NOx reduction. Te vessel will also be able to run on diesel, which would also prevent any methane slip. NA
The Naval Architect July/August 2011
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