1. Practical Energy Conservation Tips for Gas Turbine Propulsion Ships

2. iENCON Operational Tips A main engine with higher fuel rate may indicate a need for maintenance Use of the main engine with lower fuel rate until maintenance is performed on degraded engine Fuel savings up to 25% One main engine at higher power level Single Main Engine Operations

3. iENCON Operational Tips Main engines on same shaft line may have different fuel rates One main engine may be better for low speed and the other for higher speeds Selective Use of Main Engines

4. iENCON Operational Tips Efficiency increases as load is increased GTGs = 25-30% of total UW fuel consumption Do not continuously idle a generator GTG Operations

5. iENCON Maintenance Tips Conduct corrective maintenance Adherence to PMS schedules Maintenance Practices Keep fuel clean and water free Prevent seawater contamination Maintain proper fuel temperature to optimize filtration and purification Fuel Treatment Minimize unnecessary thermal cycling Prevent excessive engine vibration Perform borescope inspections to monitor condition of internal turbine components, which can reveal existing or incipient problems Miscellaneous Items

6. iENCON Maintenance Tips Salt air severely taxes air system Periodically clean moisture separators Dirty air can cause corrosion to occur in engine’s hot section Verify integrity of moisture separators and mesh screens to prevent damage to turbine and blading by FOD Avoid excessive pressure drops as Pressure drop of 1”Hg = fuel flow increase of 3.2% Caused by dirty demisters, clogged louvers Can cause blow in doors to open allowing FOD 10°F increase in ambient air temperature can trigger 2.5% increase in fuel consumption in order to hold power output constant Combustion Air & Intake System

7. iENCON Maintenance Tips Extracted from sixteenth stage of LM2500 gas turbine Up to 12% of engine air flow extracted as bleed air Increases fuel consumption by up to 16.5% Decreases maximum power output 25 GPH saved by securing bleed air Repair leaky bleed air system components Bleed Air

8. iENCON Maintenance Tips Removes deposits and impurities Turbine turned with starter motor Detergent sprayed into inlet of gas generator Reduces compressor fouling and corrosion Adhere to PMS for cleaning frequency Water Washing Engines

9. Questions