Page 12: of Maritime Reporter Magazine (April 1973)

Turbo Power And Marine

Receives Lockheed Contract

To Power New Icebreaker

Turbo Power and Marine Systems, Inc. of

Farmington, Conn., has been awarded a contract to supply a combined gas turbine and diesel pro- pulsion system for the second new United States

Coast Guard icebreaker. This contract, like the propulsion system contract for the first icebreaker, was awarded to TPM by Lockheed Shipbuilding and Construction Company of Seattle, Wash.

This new 400-foot 12,000-ton vessel will be the second in the class of the world's largest and most powerful icebreakers, and will be built by

Lockheed under a letter of contract modification with the U.S. Coast Guard. If will be delivered early in 1976, while the first vessel in the class, the Polar Star WAGB-10, will become operational in 1974.

Under the contract, Turbo Power and Marine

Systems, Inc. will furnish three Pratt & Whitney

Aircraft FT4 gas turbines for boost power. TPM will also furnish six diesel engines for cruise electric generators and motors, reduction gearing, and various engine room and bridge controls.

This new class of icebreakers will have one and one-half times the power of the Soviet Union's

Lenin, presently the most powerful icebreaker afloat. Each ship will carry 165 men, including 10 scientists. These 400-foot vessels will have a beam of 83 feet 6 inches, and a design icebreak- ing draft of 28 feet. The maximum cruising range at 13 knots will be 28,275 miles, and the sustained sea speed under diesel power will be 17 knots.

The ships will be able to break ice six feet thick at a continuous 3 knots, or ice up to 21 feet thick by ramming. Each Icebreaker will carry two

Sikorsky HH52A helicopters for scouting sur- veillance.

Under cruise conditions, each icebreaker will use six diesel engines to drive electric generators which, in turn, will power electric motors to drive three controllable pitch propellers. Die- sel power will also be used to break ice up to four feet thick. However, for thicker ice, the vessel will switch to gas turbine power. Each

Pratt & Whitney Aircraft gas turbine will produce 20,000 shaft horsepower, giving the ves- sel a total of 60,000 gas turbine horsepower, although each turbine is rated to produce up to 25,000 shaft horsepower.

Lockheed engineers said this class of Coast

Guard icebreakers will have a novel hull shape with a stronger structure, special steering innova- tions, an oceanographic system with a portable laboratory and data transmission systems, plus greatly improved living quarters for the crews.

This new ship will be the Coast Guard's 11th ice- breaker.

This new icebreaker will bring to 14 the num- ber of U.S. Coast Guard vessels to use Pratt &

Whitney Aircraft gas turbines. The Coast Guard has 12 high-endurance cutters in commission on the Ea,st and West Coasts. Turbo Power 'and

Marine Systems, Inc., a subsidiary of United

Aircraft Corporation, has, in the past decade, sold more than 900 P&WA gas turbines for use in electric power generation, natural gas transmis- sion, the petrochemical industry, and marine service.

Aluminum Plate Shipped 6,000 Miles To Norway

For LNG Supertanker

Aluminum! Company of America has received its third order for 7,000,000 pounds of alumi- num plate from Kvaerner Brag A/S, Oslo,

Norway, for use in construction of six spheri- cal tanks to be installed aJboard a 125,000- cubic-meter-capacity liquefied natural gas (LNG) supertanker.

The entire 21,000,000 pounds of plate will be produced on the world's largest rolling mill, a 220-inch giant at Alcoa's Davenport (Iowa)

Works.

The plate will be formed there into curved sections weighing up to 13,600 pounds each and Shipped more than 6,000 nautical miles to

Kvaerner's Moss-Rosenberg shipbuilding yard in Stavanger, Norway. Delivery will start this summer.

Commenting on Alcoa's growing role as a supplier to the LNG industry, George E. Herr- man, corporate manager-LNG, said : "The 220- inch mill's capabilities and capacity reinforce

Alcoa's position as the leading supplier of alu- minum to the burgeoning LNG industry. "Several LNG tank fabricators have already indicated that use of extra-wide and tapered plate produced by the 220-inch mill saves up to 20 percent of the welding required to fabri- cate spherical tanks."

Five of the 5083 alloy aluminum tanks to be installed in eadh ship will have an inside di- ameter of approximately 115 feet, while the sixth will measure nearly 99 feet. The plate shapes will be fabricated into seven ring sec- tions, to be joined with horizontal welds. Two aluminum "polar caps" complete the spheres.

Special machined aluminum plate, seven inches thick, will be used for the tanks' equator- ial sections. These sections are also part of the tank support system, unique to the Kvaerner spherical tank design.

Alcoa will also supply to Kvaerner all of the extruded aluminum stiffeners required for the tank skirt support ring. These shapes will be produced at Alcoa's Lafayette (Ind.) Works on a 14,000-ton-capacity extrusion press, one of few such facilities in the world.

Welding electrode to assemble the tanks will be supplied by Alcoa's Massena (N.Y.) Opera- tions.

The three LNG supertankers are being built for a shipping company owned by Gotaas Lar- sen Shipping, New York.

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