Page 50: of Maritime Reporter Magazine (September 1973)

Rolls Royce Gas Turbine

Approved For Marine Use By

Lloyd's Register Of Shipping

Lloyd's Register of Shipping has recently ap- proved the design of the Rolls Royce Olympus

TM3B gas turbine for use as a main ship propul- sion unit and for other marine duties.

The TM3B engine is a fully marinized version developed from the Olympus series of aero gas turbines, of which the latest is installed in the

Concorde. In its marine form, the Olympus has been adopted for propulsion in many naval vessels and is already in service with several navies. A closely similar type is also in use for land-based power generation.

The marinization of a pure jet aero engine is achieved essentially by the addition of a power turbine to provide an output shaft drive, the basic engine being used as a gas generator unit. Further design changes affecting the engine structure and the control systems are necessitated by the require- ment to operate continuously at sea level. Special attention is also paid to the effects of operation in a corrosive marine environment, involving the selection of resistant materials for components most affected and the provision of air filtration to minimize salt ingestion.

The operation and control of the TM3B is fully automated for remote or unmanned running and a comprehensive range of protective and safety devices is incorporated. Fire risks are minimized by the installation of engines in sealed enclosures within the engine room, equipped with automatic fire extinguishing systems.

Approval of the TM3B design by Lloyd's Reg- ister is for a continuous service rating of 18,000 blip at 5,370 rpm (power turbine output) and a corresponding maximum rating of 21,000 blip at 5,660 rpm. This approval follows the examination of the engine design for compliance with the So- ciety's Rules for marine gas turbines, in respect of basic structural integrity and safety and reliability in service.

TM3B engines certified under this approval will be subject to the usual Lloyd's Register sur- vey requirements for marine engines relating to manufacture, testing, installation and maintenance.

Frigitemp Awarded $40-Million

Subcontract From Litton

Frigitemp Corporation, New York, N.Y., has been awarded a $40-million subcontract by

Ingalls Shipbuilding Division of Litton In- dustries to perform joiner installation work on a series of new 'Navy destroyers and am- phibious assault ships.

Gerald Lee, Frigitemp president, said the contract—one of the largest of its kind ever awarded in the marine field—would be carried out by Frigitemp's Marine Division. He said the company is required to secure necessary performance bonds under the contract.

The subcontract to Frigitemp involves work on five LHA amphibious assault ships and 16 DD-963-class destroyers, with an option for future contracts on 14 additional destroyers.

Under the subcontract, Frigitemp will per- form all joiner work on the vessels, including the assembly and installation of galley equip- ment, crew accommodations furnishings and other interior finishing work aboard the ships.

Mr. Lee said Frigitemp will coordinate the contracts from the company's new plant out- side Gulfport, Miss., located about 40 miles from Pascagoula, where the ships are in pro- duction.

MILLION POUND LIFT: When Ingalls Shipbuilding Divi- sion of Litton Industries in Pascagoula, Miss., moved the deckhouse for the first of a fleet of amphibious assault ships it is producing for the U.S. Navy, the first direction was straight up—100 feet. The all-aluminum deckhouse, five stories high and weighing more than a million pounds, was fabricated on the ground and then lifted aboard the ship in two sections by four 200-ton-capacity cranes. After reaching the height necessary to clear the top deck of the LHA (background), the two sections, each weighing in excess of 250 tons, were moved into place on the starboard side of the ship. The deckhouse, which will contain all the ship's electronics and com- mand and control functions, measures 42 feet by 180 feet by 50 feet high. The mast atop the structure adds an additional 54 feet to the total height, making the LHA tower some 200 feet above the ground. Designed by In- galls to transport and land a Marine battalion landing team and support equipment, the LHA is 820 feet long at the flight deck, as large as a World War II aircraft carrier.

The first ship, named Tarawa, will be launched this year.

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INC. 54 Maritime Reporter/Engineering News