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Feature 5 | PROPULSION SYSTEMS REPAIRS AND UPGRADES


Combined propeller and rudder refit optimises operation


Rolls-Royce’s Promas Lite system is expected to give the cruise ship Carnival Glory an 11% efficiency liſt.


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arnival Cruise Lines has selected the Rolls-Royce propulsion system Promas Lite, which combines both


the propeller and rudder in a single unit, for a refit to its cruise vessel Carnival Glory. Preliminary analysis of speed and power trial measurements are said to indicate an increase in propulsive efficiency of between 11 and 13%. Te selection of the Promas Lite system


followed close cooperation between Carnival Cruise Lines and Rolls-Royce Marine Services and came aſter extensive laboratory testing at the Rolls-Royce Hydrodynamic Research Centre in Sweden. Tis process produced an optimised Promas Lite design which has been tailor- made to fit the actual operational profile of the Carnival Glory, which uses lower speeds than the vessel was originally built for. Te new twin 5.8m Promas Lite propulsion


system was installed during the ship’s regular dry docking at Grand Bahama Shipyard in February this year. Te new propeller and rudder system replaced the old five-bladed mono-block propellers with modern four-bladed Rolls-Royce propellers featuring bolted blades, hub caps and rudder bulbs. As well as being designed to reflect the vessel’s actual operational profile, the new propeller design is further intended to achieve maximum fuel efficiency and emission reduction, Rolls-Royce says.


Rolls-Royce has fitted its Promas system to a cruise ship during a recent drydocking with reportedly very positive results.


Extensive full-scale testing on Carnival


Glory, as well as another cruise ship, Carnival Freedom, was performed before and after installation of the new Promas Lite propeller system. Tis data has supported the projected efficiency gains, the company claims. In a separate development, to support


its propulsion system repair and refit work Rolls-Royce has opened five new or enhanced service centres around the world in recent times. In the USA, centres have been opened in Galveston and Seattle, in Australia at Port Melbourne, in Brazil at Rio de Janeiro and also in the Indian port city of Mumbai. SRCT


Ice damage generates dive repair work


Companies specialising in underwater repairs have experienced increased workload caused by damage to propellers.


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he USA-based Subsea Solutions Alliance (SSA) reports that its underwater repair technicians


have repaired propellers in a variety of locations in Europe, North America and the Caribbean in recent weeks. According to the company: “With a significant number of propellers straightened


and repaired using our proprietary techniques, vessels remained in service without delay. When high vibrations and unusual loading occurs on the propulsion engines, immediate emergency repairs are necessary to avoid damage to stern tube components and restore vessel performance.”


While the vessels were conducting


cargo operations, the diver propeller specialists from member companies in The Netherlands, Miami, Halifax and Vancouver were busy below the surface restoring and repairing propellers with minimal or no hydrodynamic performance losses. SSA has said that using specialised


Shiprepair and Conversion Technology 2nd Quarter 2010


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