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Steve B June 8th, 2004 09:41 AM

Jet engines or decoration on Diamond/Sapphire Princess
Does anyone know what the gray/silver objects are near the top of the Diamond/Sapphire Princess ships? They appear to be two cylindrical...somethings. Everyone I show the picture to says, "those look like Jet Engines."


GummyBear June 8th, 2004 10:14 AM

Re: Jet engines or decoration on Diamond/Sapphire Princess
Just a guess....
Air intakes maybe?

Kuki June 8th, 2004 10:23 AM

Re: Jet engines or decoration on Diamond/Sapphire Princess
The jet engines are just decorative.

Shelly U. June 8th, 2004 10:30 AM

Re: Re: Jet engines or decoration on Diamond/Sapphire Prince
I heard they are water storage tanks. I ordered the video tape from the cruise line and am waiting for it to get shipped to me. I'm sure it'll be covered on there. Perhaps someone who has already watched it could enlighten us for sure???

Ahracer June 8th, 2004 11:01 AM

Re: Jet engines or decoration on Diamond/Sapphire Princess
The ship actually uses jet engines as generators to produce electricity but they are down below. The jet engines on top are are mostly to showcase the fact the ship has jet engines however they do act as an air intake for the jet engines.


runner15km June 8th, 2004 12:01 PM

Re: Jet engines or decoration on Diamond/Sapphire Princess
GE Marine Engines' LM2500+ Gas Turbines to be Used in CODAG Configuration On Four Princess Cruises' New Builds
November 11, 2000 -- EVENDALE, Ohio - GE Marine Engines announced that its LM2500+ aeroderivative gas turbines would be used in Combined Diesel And Gas (CODAG) turbine configurations on four Grand Princess-class cruise ships currently on order from Princess Cruises.
One LM2500+ gas turbine will be used on each vessel in conjunction with medium-speed diesel engine-driven alternators. Mitsubishi Heavy Industries Ltd. (MHI) will construct two 113,000-ton cruise ships at its Nagasaki, Japan shipyard. Each ship will use four diesel engine-drive alternators. Chantiers de l'Atlantique will build two 88,000-ton vessels at its facilities in Saint Nazaire, France, each of which will use two diesel engine-driven alternators.

The Mitsubishi-constructed vessels are the largest cruise ships ever ordered by Princess and the first to be commissioned from MHI. All four Grand Princess-class ships are part of a five-year expansion program that will see the Princess fleet grow to include 14 ships carrying more than 1.5 million passengers annually.

According to Princess Cruises, the diesel and gas turbine propulsion arrangement employs environmentally sound technology that supports their ongoing commitment to this important issue. At the same time, this design incorporates better space usage through installation of the gas turbine in the funnel area of the ships, thereby enabling an even wider range of public rooms and onboard facilities to be introduced.

The LM2500+

The LM2500+ is an uprated version of GE's highly-successful, well-proven LM2500 aeroderivative gas turbine, which in turn is directly derived from GE's CF6 family of commercial aircraft engines and GE's TF39 military engine. The CF6 family is used on DC-10, MD-11, A300, 747 and 767 aircraft, which have logged over 200 million flight hours. Currently over 1,000 LM2500 gas turbines have been delivered for service on a variety of cruisers, frigates, destroyers and patrol boats for more than 26 international navies (see Table 1 for other LM2500+ characteristics).

Table 1
LM2500+ Aeroderivative Gas Turbine
Performance Specifications*
Output (shp) (kW) 40,500/30,200
SFC (lb/shp-hr) (g/kW-hr) 0.354/216
Exhaust gas flow (lb/sec) (kg/sec) 189/86
Exhaust gas temperature (oF) (oC) 965/518
*Average performance, 60 HZ, 59oF, sea level, 60% relative humidity, no inlet/exhaust losses

GE Marine Engines will manufacture the LM2500+ gas turbines at its Evendale, Ohio facility. S&S Energy Products, a GE Power Systems business and GE Marine Engines Marine Systems Supplier, sold and will place the LM2500+s into propulsion packages at its Houston, Texas manufacturing facility. The four ships are due for delivery between the fall of 2002 and the spring of 2004.

Princess Cruises is the North American premium cruise division of P&O Princess Cruises, the third largest cruise company in the world. Coral Princess and Island Princess, the line's 88,000-ton French ships, will debut in October 2002 and June 2003, respectively. The 113,000-ton Diamond Princess and Sapphire Princess being built by MHI will launch in July 2003 and May 2004, respectively.

GE is no stranger to the cruise industry. The world's first gas turbine-powered cruise ship, the Millennium, was recently placed into commercial service by Celebrity Cruises. The ship features an LM2500+-based COmbined Gas turbine and steam turbine integrated Electric drive System (COGES) configuration. Three additional Millennium-class cruise ships being built for Celebrity Cruises as well as four Vantage-class ships being built for sister company, Royal Caribbean International, will use LM2500+ gas turbine-generator sets for main propulsion and on board power.

Rick McCusker June 11th, 2004 05:02 PM

Re: Jet engines or decoration on Diamond/Sapphire Princess

Those gray things LOOK like gas turbines, but they aren't. It would be one heck of a crive shaft to connect them from up there to the reduction gears in the engine rooms for propulsion.

FYI: Gas turbines make a heck of a difference. I was stationed on 2 different 378-foot Coast Guard cutters in the early-mid 1970's. Under normal conditions, they used two diesel-electric setups for propulsion and could do 22 knots. They also have two gas turbines installed for when the ship has to get somewhere in a hurry. With the turbines on the line, they could easily do 32 knots or more. However, the fuel consumption rate was drastically increased when running the turbines. On diesel, the ship's range was 12,500 miles. With the turbines on the line, the range was reduced to 2,500. Yep, the ships can really haul cheeks, but not economically.

Rick McCusker

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