Page 26: of Maritime Reporter Magazine (February 2003)

Cruise Industry Annual

Technically Speaking: "It (too) is Big"

The Navigator of the Seas has three azimuthing electric 14 MW Azipod units. The two units on the sides are fully azimuthing whereas the one at the centereline is a fixed Azipod unit. Azipod incorporates an electric AC motor, located inside the propeller pod, which directly drives a fixed-pitch propeller. It has been developed jointly by Kvaerner Masa-Yards and ABB. "We could not operate a ship this large using only two propellers," said Harri Kulovaara, senior vice president of fleet operations and new- building, Royal Caribbean Cruises Ltd. "The pods are essential ... without them, the maneuverability would not be there."

With Azipod propulsion no shaft lines, internal electric propulsion motors, rudders and rudder machinery, nor transversal stern thrusters are needed. By this weight is saved and space is available for other advantageous use, such as added passenger capac- ity. In addition, the Azipod propulsion system improves the ship's fuel efficiency. The Navigator of the Seas has been designed to manage 40 knots side winds — where ships normally can stay maneuverable in 25-30 knots winds. To handle this, there are four 3 MW tunnel thrusters in the bow in addition to the Azipod units in the stern. Sea trials shown that the ship can even move side- ways with a speed of 3 knots.

High Level of Redundancy

Navigator of the Seas has a very high level of plant redundancy, which has an impact on the safety of the ship. Navigator has a redundancy built into it in such a way that at least 50 percent of nominal capacities remains available after any single failure.

Some features include: • Divided machinery plant into two independent parts, including main machinery plant, fuel tanks, electric machinery, auxiliary systems, ventilation, piping, cabling and control and automation, basically from "fuel storage tanks to the propellers." • Divided redundant main electric distribution and monitoring between the wheelhouse and control room (on Deck 1), and between the two separated high voltage switchboards (on Deck 0) and the three separate cyclo-converter rooms (on Deck 0 and

Tween Deck). • Divided redundant telephone, public addressing, control and alarm systems.

The ship has Det Norske Veritas' RP — Redundant Propulsion classification. It is the highest level of redundancy classification.

Waste handling

On deck 1 are also the garbage handling equipment. This is one of the first installations onboard a cruise ship designed completely without damping/discharging to sea. The system includes a 1600 kW incinerator, o food waste system, a recycling and storage system for glass, metal, ash and paper - including a new automatic ash transport and packing process.

This statue stands guard outside of the Navigator's "19th Hole" on a cold day in

Finland just prior to the ship's delivery

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Maritime Reporter & Engineering News

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