LNG boxship design receives GL approval

07 Sep 2012
The IPP CV Stream (Technolog)

The IPP CV Stream (Technolog)

Germanischer Lloyd says that the Approval in Principle (AIP) certificate which it has granted to Technolog’s IPP-designed range of LNG-fuelled container ships demonstrates the increasing acceptance of gas as ship fuel.

According to GL, virtual elimination of sulphur and particulate emissions and significant reductions in NOx and CO2 mean that the LNG option should be considered by every ship owner and operator. Suitable designs are now ready for the market, of which the Technolog Stream range of 3,000TEU to 5,000TEU liner or feeder vessels designed for worldwide service is a good example.

"At GL we see the development of LNG as a fuel for shipping as a key part of the industry's drive to curb costs, reduce emissions, and remain the world's most efficient means of transporting goods," said Dr Pierre Sames, head of GL's research and rule development department. "The spread of LNG technology will not only allow the industry to improve its overall environmental footprint, but to remain competitive in an era of rising bunkering costs."

The entire vessel design concept is focused around saving energy. A single screw is directly driven by a dual-fuel, two-stroke, 22.9 MW engine developed specifically for LNG applications by MAN. The same dual-fuel system is used for the auxiliary power generators and boilers. Exhaust gas boilers and waste heat recovery equipment are also included in the design.

The LNG fuel systems were developed jointly with TGE Marine Gas Engineering and include a fixed bunker tank inside the vessel and a portable deck-mounted LNG tank system which can be used to provide extra capacity. For bunkering, the fuel containers will be connected to a docking station currently in development. Hull lines have been optimised by HSVA (Hamburgische Schiffbau-Versuchsanstalt) with input from GL's FutureShip unit to minimise fuel consumption as well as resistance in water and air while maximising cargo capacity and ensuring maximum stability. With FutureShip support, the designers were able to model a large number of variants, select the traits desired, and then modify the best variants to arrive at an optimal hull form. Improved hull lines allow installation of a highly efficient, relatively slow-running propeller from project partner MMG (Mecklenburger Metallguss). A Becker Marine rudder is fitted for manoeuvrability.

The Stream 4200 LNG's 32.25m beam allows passage through the existing Panama Canal locks. A draught of 10.50m to 12.00m means the vessel can operate worldwide, including the Kiel Canal (future dimensions) between the Baltic and North Sea. The vessel is subdivided into several double 40-foot holds. The forward hold is covered and designed to carry dangerous goods. The cargo holds behind this are of open-top design, including the hold behind the superstructure located semi-aft.

The forward mooring arrangement is fully sheltered by a large cover which forms an integrated part of the unique wave-breaking structure. The aft one is covered by the aft container stack. The layout can be configured to suit multiple shipping routes, with optimal flexibility as it is based on existing technology.

Hans-Jürgen Voigt, managing director of Technolog, spoke of the potential benefits of the new design at the presentation ceremony: "Looking ahead to 2020, our projections suggest that when we compare the operation of the Stream against a conventional vessel in an emissions control area (ECA), we arrive at a conservative estimate of fuel cost savings in the region of 30 per cent. With this design we show that it is no longer just a dream to build environmentally friendly vessels, which operate both economically and fulfil regulatory requirements."

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