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Engines fuelled by natural gas are also available for electric
transmission or direct mechanical drive. Anchor handling/towing
winches have been rationalised and a new winch based on 64 bar hydraulic
engines is coming into use. This is a flexible design in that the
width of the drums and spooling gear can be configured to suit the
beam of the vessel and the owner's requirements. Rolls-Royce has
been developing its own dynamic positioning and integrated bridge
systems. The first example is now in service in a Norwegian coast
guard ship, and IMO-class dynamic positioning (DP) systems will
be introduced later this year.
A major success story in supply boat propulsion is the Ulstein
Aquamaster Azipull thruster.This azimuthing thruster has a streamlined
underwater unit and a pulling propeller. The first pair for offshore
use were installed in the diesel electric UT 745 E platform supply
vessel (PSV) Havila Tampen (now Bourbon Tampen) and
fuel consumption in its normal North Sea supply duties has been
dramatically reduced by over 16%, not only saving money but reducing
emissions. At the same time crew comfort is enhanced by reduced
noise and vibration. Many offshore vessels now on order are specifying
Azipull propulsion.
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