Practical Energy Conservation Tips for Gas Turbine Propulsion

Ships

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

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

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

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

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

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

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

Questions