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Feature 1 | Cruseship teChnology
New power for the Millennium
Celebrity Cruises’ Millennium class vessels have each had a diesel generator
plant fitted in a bid to reduce annual fuel consumption.
T
he four vessels in Celebrity Cruises’ modifications to the ships’ structures were speeds, they will operate in parallel with one
Millennium class are among the fully appraised and that any issues were of the existing gas turbines when cruising
most technologically advanced in resolved beforehand. speeds reach at least 7knots, and the turbines
the company’s fleet, with each having been The appraisal covered, for example, the will now only take over completely at high
delivered since 2000. They were the first necessary marine gas oil to heavy fuel oil speeds.
passenger ships to be powered solely by gas tank modifications, the electrical system The project required more than 4miles
turbines but rapid rises in the cost of the fuel integration, vibration simulation, sea and of additional piping and two new boilers,
in recent years took their toll on the ships’ fresh water cooling upgrades, steam power a new fuel treatment plant, fuel tank
profitability. plant calculations, and the ships’ revised safety conversions, and other modifications.
Therefore, in 2007, a project was initiated and fire-fighting control plans. Additional An integral part of the new installation
to install diesel-electric power to complement crew members also pried out and moved on each ship was a pre-fabricated
the gas turbines, intended to save an estimated equipment, laid piping, and carved out space 200tonne double bottom hull segment,
US$6 million annually in fuel per ship by for the new engines, in order to further which replaced the part of the hull that
using less expensive diesel fuel. With each decrease the time needed for the retrofit. was removed to make the modifications
ship weighing in at 91,000gt, and the space ‘There was close cooperation between all possible, and which formed the foundation
constraints that accompany attempting to three parties throughout, and this all proved for the diesel generator plant itself. Lloyd’s
cram an 11.3MW-producing diesel-electric worthwhile when the vessels departed Register integrated closely with the onsite
generator into an engineroom already drydock after 17 days with all engineering teams so that classification could proceed
filled with gas turbines, it was clear that the work complete and without unexpected quickly and without difficulty, minimising
installation would require a great deal of technical surprises,’ commented Richard disruption to the schedules of the
planning. Goodwin, manager, passenger ships, at Millennium class cruiseships.
The work was project managed by Lloyd’s Register. ‘Cruise line operators operate their
Aker Yards Lifecycle Services, under the The higher efficiency of the diesel vessels to unyielding time schedules,’
supervision of Celebrity Cruises and Lloyd’s generators should enable each ship to reduce says John Krousouloudis, senior vice
Register, and each vessel underwent or is due its overall fuel consumption by approximately president marine operations, Celebrity
to undergo a 17-day drydock programme 3600tonnes a year. The generators will Cruises. ‘When it is necessary for ships to
at Sobrena shiprepair yard in Brest, France. provide base load power, covering the hotel be removed temporarily from service, we
Collaboration between the three companies functions such as lighting, air, and galley expect a trouble-free project. With such a
started 12 months before work began, operations while the ships are in port, as well tight timeframe on this occasion, Lloyd’s
which helped to ensure that the proposed as propulsion at low speeds. At intermediate Register’s assistance has been invaluable.’
Celebrity Millennium had its refit in April
2007, followed by Celebrity Constellation in
May. Both ships are back in service, and the
generators are providing the fuel economy
benefits anticipated by Celebrity, as well as
demonstrating excellent noise and vibration
behaviour, says the company.
Similar installations are due during the
drydocking of six other ships, comprising
Celebrity Summit and Royal Caribbean
International’s four Radiance class ships,
then concluding with Celebrity Infinity in
November 2008. NA
A hydraulic lift boosts a prefabricated
diesel-electric engine block into place
on the starboard side aft of Celebrity
Millennium during an April drydock.
32 The Naval Architect February 2008
NA Feb 08 - p32.indd 32 05/02/2008 09:35:16
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