Boskalis jaarverslagen 2011

Environmentally friendly equipment

We take targeted measures to ensure we have equipment that enables us to operate with minimum environmental impact. In addition to our research and the measures we take to mitigate turbidity and carbon emissions, we and a number of our suppliers have cooperated to develop new systems and applications which have reduced the consumption of lubricants and lubricating oil on our dredgers and other ships. Bilge water separators and ballast water treatment systems are used to clean the bilge and ballast water on our dredging fleet. New tugboats are designed in such a way that they no longer require ballast water tanks.
Together with our foundries we have developed a scrap management program to recycle pump casings, impellers and cutter teeth. In 2011 a total of 265,770 kilos of waste material was recycled.
Because we strive for sustainability throughout the chain we attach great value to the safe and environmentally friendly dismantling of vessels that we take out of service. You can find more information about this on pages 62 and 63 of our 2009 Annual Report. In 2011 we sustainably dismantled four of our large ships: the Cornelia, the Cetus, the Alpha B and the Freeway, as well as some smaller equipment. The Cornelia and Freeway were broken up at a specialized yard in The Netherlands and Belgium respectively. The Alpha B and the Cetus were broken up at a yard in India, which we first visited and then approved following an audit. The shipyard is fully certified by Bureau Veritas and Germanischer Lloyd.

Limiting emissions

The Emissions Taskforce studies ways of reducing pollutant emissions. Led by a member of the Board of Management the Taskforce is composed of a broad range of specialists and professionals from across the organization. In 2011 an environmental officer for the fleet was brought in to serve on the Taskforce along with the environmental officer for the execution of the works who was appointed in 2010. The Taskforce met four times in 2011. Subjects on the agenda included the use of scrubbers, the use of cleaner fuels, research into hybrid engines and weather routing on our ships.

  • Cleaner and more efficient engines: we conduct research into cleaner and more efficient engines. These may be hybrid engines, such as the diesel-electric engines which power our new fallpipe vessel and our hybrid bulldozer.
  • Cleaner fuel: wherever possible our tugs use green shore-side power during their standby periods, whilst our dredgers use low-sulphur fuel in the so-called Sulphur Emission Control Areas. At present we are conducting a feasibility study in cooperation with Aalborg Industries into the use of a so-called scrubber which cleans exhaust fumes and is designed to prevent sulphur emissions. Initial results are positive but further research is still needed.
    We are also looking at the possibilities afforded by cleaner types of fuel such as LNG and biofuel. This is contingent upon local infrastructure being present to enable the bunkering of such fuels.
  • Development of new equipment and adaptation of existing equipment: our new equipment complies with the highest fuel consumption requirements. Where possible we enhance the sustainability of our existing equipment. Research by Dutch institute MARIN into adapting the trim on trailing suction hopper dredgers produced interesting results in 2011. The aim is to minimize resistance when sailing empty, which will have a positive impact on both fuel consumption and emissions. Follow-up research is to be undertaken.
    Lamnalco is involved in a study aimed at designing a hybrid tug using LNG als fuel.
    SMIT has been involved in various research projects to improve the environmental performance of its vessels. The various projects mainly focused on the propulsions system and considered both alternative fuels and system layouts. Through the development of models for environmental impact and life cycle cost assessments, SMIT is now able to provide clients tugs with ‘fit for purpose’ propulsion configurations, incorporating (local) environmental and operational requirements and future emission regulations. The well-known E3 principle serves as a guideline in the design of such new concepts, i.e. designing with an optimum balance between Environmental performance, Efficiency of operations and Economic viability.
  • Ship Energy Efficiency Management Plan (SEEMP): the main purpose of a SEEMP is to raise crew awareness of on-board energy consumption. Together with our fellow dredgers in the industry association European Dredging Association (EuDA) we are working on formulating clear definitions and measures for a SEEMP for individual ships. Boskalis wants to start introducing SEEMPs on our ships in 2012, which will include a weather routing program. This will enable our ships to determine the best possible sailing route at all times as the program will make recommendations for avoiding certain weather conditions or heavy seas. As well as optimizing safety, this can reduce both voyage times and carbon emissions. After testing various weather routing programs Boskalis signed a contract with Meteo-consult in 2011. The weather routing program has already been introduced on more than 20 of our larger dredging vessels.

Added to My report add to My report Source: CSR Report 2011, Our environmental performance, page 50