fuel saving
New bulker design delivers fuel savings
BV certifies Stena’s energy management systems Bureau Veritas has completed the first certification audit of any shipping company to the new standard, ISO 50001-2011-Energy Management Systems. Stena’s ship management division, Northern Marine Management Ltd including Northern Marine Management (USA) LLC, has achieved certification to BS ISO 50001, which addresses: • systematic monitoring and control of energy usage • help in optimising efficiency and reducing fuel consumption • a reduction in the company’s environmental footprint • cost savings for shipowners. BS ISO 50001 Energy Management Systems is intended to assist organisations in making better use of their existing energy consuming assets, create transparency and facilitate communication in managing energy resources, and promote best practices in energy management.
Only four other organisations in the UK (including the Royal Mint) have earned BS ISO 50001 certification.
A Mewis duct contributes to the fuel efficiency of the BC57K bulk carrier
A 14 per cent reduction in fuel consumption is reported from the first example of a new bulk carrier design – the BC57K – recently delivered in China to Delphin. Aquila has headed a series of Supramax bulkers from the Jiangsu Hantong yard, the 57,000 dwt class based on a SDARI design with appraisal, building and sea trials supervised and performance verified by Lloyd’s Register. Efficiency improvements have resulted
from a number of straightforward but effective modifications, such as derating the main engine, optimising a new propeller design for the derated engine, and fitting a MEWIS duct. The engine’s output was reduced by almost 1,000kW to 8,500kW.
The daily main engine fuel consumption at a speed of 14 knots on ballast draught is around 26 tonnes (compared with around 29.4 tonnes for an unmodified ship design); and at a speed of 13.5 knots on the design draught the daily fuel consumption would have been around 29.8 tonnes but is now around 26.3 tonnes. “We will keep on strengthening the optimisations of our vessels and endeavour to build more eco-friendly and fuel efficient versions than previous deliveries,” says Meng Cheng Jun, president of the Jiangsu Hantong group, which completed design optimisation and tank testing independently. The design meets the requirements of EEDI-Phase 1.
Danes seek to cut ropax ferry emissions A new study initiated by Denmark’s Green Ship of the Future project will investigate possibilities for reducing emissions from a ropax ferry. The focus will be on the propulsion and related machinery but other areas affecting emissions are also expected to be assessed. An existing ropax ferry with a known operating profile will be studied, making it possible to benchmark the emissions reduction against existing data. Among the new project elements will be investigations of HVAC systems, insulation, windows and lighting. Another element could pursue how cargo
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deck design can decrease the loading time in port, and thereby help to reduce ship speed requirements and hence emissions. The participating partners in the ropax study are the Danish Shipowners’ Association, Desmi, Deif, DNV, Force Technology, Lloyd’s Register, Johnson Controls, Martec, Novenco, Rockwool, Scanel International, OSK-ShipTech, Saint Gobain Marine Applications, Vestergaard Marine Service and the Aarhus School of Marine and Technical Engineering. The study is led by Danish consulting naval architect and marine engineer OSK-ShipTech.
Northern Marine implemented its first Shipboard Energy Management Plans on board Stena AB tonnage during 2005, and last year introduced an environmental and energy efficiency rating scheme on five roro vessels. The monitoring and measurement processes were thus largely in place for the new fleet and company-wide standard.
These were codified and documented with clear statements of intent in the form of two new company policies: the Safety, Environmental Energy and Quality Policy; and the Energy Management and Efficiency Policy. “This is an important step for Northern Marine and for shipping as a whole,” says Claude Maillot, Bureau Veritas ships-in- service director.
GL approved to certify energy management Germanischer Lloyd is now accredited by DAkkS, Germany’s National accreditation body, to provide worldwide certification of energy management systems according to DIN EN ISO 50001 2011. A company’s energy efficiency and performance can be sustainably improved by implementing systems and processes that conform to the new standard.
“The continuing increase in global greenhouse gas emissions should prompt many companies to rethink the energy management systems they have in place,” says Bernhard Stander, GL’s global head of ISO Systems Certification. MP
Marine Propulsion I February/March 2012 I 127
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