Page 47: of Maritime Reporter Magazine (July 1993)

Hoists for all your requirements.

PROPULSION UPDATE

GE Introduces

Alternative Technology

For Naval Ship Propulsion

GE Marine & Industrial Engines (M&IE) in- troduces the LM2500R gas turbine, touted as an alternative technology for naval ship propulsion.

The proposed LM2500R design is a recuper- ated version of GE's widely used LM2500 gas turbine, which recently has been uprated to 29,500 bhp for U.S. Navy combatant ships and to 32,000 bhp for the U.S. Navy Sealift program.

Some benefits of the new design include: - significant improvement in the part power efficiency of the LM2500: more than 30 percent at lower power levels; - minimal changes to the current engine design to make retrofit to LM2500-powered ships practi- cal and installation in new surface combatants as simple as possible; - elimination of cost and time required to de- velop a new aeroderivative engine system aimed at comparable fuel savings: the LM2500R devel- opment is one-tenth the cost of the alternative technology currently being pursued and can be implemented in one-half to one-third of the time.

Some features of the new LM2500R include: - retention of the present 16-stage com- pressor, all high pres- sure and power tur- bine discs, most of the support structure, and all support bear- ings and shafting to provide a high degree of commonality with the current LM2500 engine; - a thermodynami- cally and aerody- namically direct re- placement to the present combustor with the shorter, cur- rent production CF6- 80C2/LM6000 com- bustor design; - the redesign of the high pressure tur- bine blades and vanes to open the nozzle area by 10 percent; - installation of variable area turbine nozzles in the power turbine to maintain high cycle temperature at partial power; - modification to the compressor rear frame and combustor casing to provide air to and from the recuperator.

Upgrade of an LM2500 gas turbine to the

LM2500R configuration can be done in lieu of an overhaul at little additional cost. Upgrad- ing one LM2500 gas turbine module per shaft on CG-47 and DDG-51 class ships to the

LM2500-recuperated configuration would pro- vide significant fuel savings, together with the operational benefits of increased range.

GE estimates that within three years, it could complete development of the LM2500R and begin retrofitting the Navy's fleet with

LM2500Rs.

The LM2500 marine propulsion gas turbine currently powers the U.S. Navy's entire fleet of surface combatants, which consist of more than 140 frigates and destroyers. The Navy has nearly 500 LM2500s for its existing and planned ships.

GE Marine & Industrial Engines is head- quartered in Evendale, Ohio.

For more information on GE Marine & In- dustrial Engines, and the company's entire range of propulsion solutions,

Circle 95 on Reader Service Card

LM2500 Fuel Conservation Program

LM2500R - Recuperated LM2500

No changes; LM2500R same as LM2500 (inlet, front frame, 16-stage compressor)

New outer compressor rear frame and

New forward power turbine casing; rebladed high pressure and power turbines; variable area turbine _ nozzles first two stages of power turbine; modified aft power turbine casing. No change to turbine mid frame, turbine disks, shafts, bearings, sumps and turbine rear frame

Lo-Rez Vibration-Control Systems On

New Shaver Tug "Vancouver"

The exceptionally-low level of engine-produced vibration and noise in the new Shaver Transpor- tation state-of-the-art 3,000-hp 76-foot tugboat

Vancouver is largely attributable to the Lo-Rez

Vibration-Control Systems.

This tug is an evolutionary step upwards from the well-known Robt. Allan/Cates tug design con- cept. Mike Boschero, vice president of engi- neering at Shaver, stated, "This is the smoothest and quietest work boat I've ever been on." Mr.

Boschero went on to say, "We will certainly put another Lo-Rez system in any new tugs we order."

The Lo-Rez system consists of 12 BR4-L5 steel- spring vibration isolators astride the Detroit 16V149TI DDEC 1,500 hp propulsion engines, two steel-spring F/HF torsionally-soft power trans- mission flexible couplings (with double-row pilot bearings) and two High Lateral Flexibility (HLF) double laminated-disc coupling assemblies be- tween the engines and the hard-mounted Niigata

ZP-2A Z-feller units. The overall mechanical isolation efficiency of the Lo-Rez system ap- proaches 97 percent at full power and speed.

Noise-level in the wheel house and deck house is 67dBA at 1,700 rated rpm. For more on Lo-

Rez Vibration-Control Systems,

Circle 58 on Reader Service Card

MarAd Challenged On Contract

The General Accounting Office claims the

Maritime Administration made an error in not awarding cargo vessel repair contracts to New

York shipyard Stevens Technical Services. New

York congressional and Senate representatives supported the challenge to MarAd's awards to large shipyards in Norfolk, Va. MarAd claims that Stevens does not meet its new standard, which includes the ability to overhaul and dry- dock naval warships. The GAO has told MarAd that the Small Business Administration (SBA) should be asked to determine Stevens' capabil- ity to perform the contracts. Should the SBA decide that Stevens meets the criteria, MarAd must terminate the contract awarded to Nor- folk Shipbuilding for repairs on one vessel and must give the contract to Stevens.

Modern cargo-handling gears:

KGW is your experienced partner. For more than 40 years we have provided cranes and winches for ships.

Our products always meet your technical requirement. We offer the most modern shipborne equipment.

Manufactured are:

Cranes

Mooring-winches

Anchor-winches

Capstans

Stearing Gears

Special winches/several types

Fishing-Technology:

Trawl warp winches

Seiner- and Net winches

Cable trawl drum winches

Cranes and all winches for fishing

For detailed information, please contact:

KEW

SCHWERiNER

MASCHiNENBAU GMBH Wismarsche Strasse 380 19055 Schwerin • Germany

Telephone 0385/57 21 -0

Telefax 0385/8120 38

Telex 39 11 89

Circle 236 on Reader Service Card

July, 1993 47