CG Main Propulsion

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Author:
Anonymous
ID:
256528
Filename:
CG Main Propulsion
Updated:
2014-01-14 19:57:16
Tags:
engineering
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Description:
F/O and L/O service systems, Shafting, Propulsion Control, LM2500
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  1. Fuel Oil Service System Drawing
  2. F/O Service Tanks Capacity
    20,000 Gallons
  3. F/O Service Tanks Locations
    • 5-162-1-F and 5-162-2-F Located in MER
    • 15-260-1-F and 5-260-2-F Located in AMR 2
  4. Fuel Oil Service Pump
              -Locations
    MER 1 & 2
  5. Fuel Oil Service Pump
              -Flow Rates
    • Slow speed: 35 GPM
    • Fast Speed: 85 GPM
  6. Fuel Oil Service Pump
              -Relief Valve Pressure
    150psi
  7. Fuel Oil Pump Logics
    • When fuel oil header pressure reaches 33 psig or less:
    •           After 2 seconds lead pump will shift to fast speed

    • If pressure remains below 33 psig
    •           For an additional 5 seconds with lead pump in fast speed, pump will shutdown
    •           Assumes that there is a system leaks
  8. Fuel Oil Pump Fault
    • When the fuel oil pressure is 35 psi of less
    •           -Automatic logic generates a pump fault alarm after 2.5 seconds
    •           -After 10 second delay, pump will stop
  9. Fuel Unloader Valve
    • Pneumatically controlled
    • Maintains system pressure 40-65 psi
    • Fails closed upon loss of LP air
  10. Fuel Oil Heater
             Design
             Temperature
             Relief Valve Pressure
    • Shell and "U" tube
    • Raises fuel temp to 135°F from 65°F
    • Relief valve set at 190psi
  11. Fuel Oil Pre-Filter
              Elements Per Housing
              Rated (GPM)
              Alarm
    • 8 Disposable Elements/Housing
    • 85 GPM & 150psi MAX
    • 25 PSID Pre-filter Delta P High Alarm
  12. Fuel Coaleser
              Filter Type
              Elements per Tower
              Removes what?
    • 10 Micron Filter
    • 10 Elements per Tower
    • Removes sediment and free water
  13. GTM Fuel Oil Emergency Trip
    • Isolates the fuel oil to the Gas Turbine Module
    • Can be activated from:
    •           PACC (SOSU)
    •           PLCC (RSOS)
    •           MER 1 and MER 2
  14. GTM/GTG Head Tanks
              Capacities
              Description
    • 620 GAL tank for MER 1 /  MER 2
    • 550 GAL for NR 3 GTG

    Perforated vertical divider separates fuel into two compartments for GTG’s or GTM’s during a casualty.
  15. Fuel Oil Service System Alarms and Indications (8)
    • Header Pressure Low (30 PSIG)
    • Heater Temperature High (130°F)
    • Pre-filter Delta P High (25 PSID)
    • Coalescer Filter Delta P High (30 PSID)
    • Coalescer Filter A/B Blocked (25 PSID)
    • Header Temp HI/LO (130/80)
    • Coalecser Filter Water High Level (Top Of Probe)
    • Pump Fault (35 PSIG FOR 2.5 SEC)
  16. Air Valve Alignment - Normal Start
    • MASKER XFER VLV         START
    • MASKER COOLER VLV    OPEN
    • HIGH TEMP B/A VLV      OPEN
    • MOTOR AIR REG VLV     OFF
    • MIXING BYPASS VLV     CLOSED
  17. Air Valve Alignment - Motoring
    • MASKER XFER VLV         START
    • MASKER COOLER VLV     OPEN
    • HIGH TEMP B/A VLV       CLOSED
    • MOTOR AIR REG VLV     ON
    • MIXING BYPASS VLV      OPEN
  18. Icing Conditions
    Ambient air <41°F and >70% humidity
  19. Bleed Air Regulating Valves
              GTM
              GTG
    • GTM 250/75 PSI
    • GTG 100/75 PSI
  20. Masker Air Belt Locations
    • 174
    • 220
    • 260
    • 300
  21. Path of Masker Air
    • Bleed Air Header (825°F)
    • Masker Air Cooler (190°F)
    • Moisture Separator
    • Masker Transfer Valve
    • Masker Air Pressure Regulating Valve (40-75psi-->28-32psi)
    • Masker Belts
  22. Path of Start/Motor Air
    • Bleed Air Header
    • High Temp Bleed Valve & Masker Cooler (400-450°F)
    • Mixing Bypass Valve Open (Motor) Closed (Start)(190°F)
    • Starter Air Filter
    • Motor Regulating valve Motor(22psig) Start (40psig)
    • GTM/GTG
  23. Prairie Air Path
    • Bleed Air Header
    • Shell and Tube Type Cooler (150°)
    • OD Box
    • Prairie Air Tube
    • Propeller Blades
  24. Uses of Bleed Air
    • Starting
    • Prairie Air
    • Anti-Icing
    • Masker Air
  25. Bleed Air System Alarms and Indications (6)
    • Prairie Air Temp High Alarm = 120°F
    • Start Air Overtemp Alarm= 450°F
    • High Press Air (HPA) Low Alarm = 1000 PSIG
    • Icing Condition Alarms = <41°F and >70% Humidity
    • Masker Air Over-temp Alarm = 200°F
    • Bleed Air Press Low Alarm = 40 PSIG
  26. Brayton Cycle
    • Intake
    • Compression
    • Combustion
    • Expansion or Power
    • Exhaust
  27. Major Engine Assemblies (1-8)
    • 1.) Inlet Plenum
    • 2.) Compressor Front Frame
    • 3.) Compressor
    • 4.) Combustor
    • 5.) HP Turbine
    • 5.4) Inlet to the PT Turbine
    • 6.) Power Turbine
    • 7.) Turbine Rear Frame
    • 8.) Exhaust
  28. GT Compressor
              Purpose
              Description
              Components
    • Compresses air for combustion
    • 16 stage, axial flow
    • Compressor front Frame
    • Rotor
    • Stator
    • Compressor Rear Frame
  29. GT Combustor
              Purpose
              Description
              Components
    • Mixes air with fuel and ignites the mixture, creating hot expanding gas.
    • Annular Type
    • 2 igniters
    • 30 nozzles
  30. GT Ignition System
              RPM turned on
              RPM turned off
              Voltage
    • On at 1200rpm
    • Off at 4500rpm
    • Convert 115VAC to 15000VDC
  31. GTE Mounted Components
    • Fuel Oil Pump
    • Lube Oil Supply and Scavenge Pump
    • Air/oil Separator
    • Pneumatic Starter
    • Speed Pick-up (NGG)
  32. GTE Power Turbine
    • Six stage axial flow
    • Engages SSS at 500rpm
  33. GTE Bleed Air
    • 8th stage: Lube oil sump pressurization and cooling
    • 9th stage: PT cooling, forward seal pressurization & balance chamber
    • 13th stage: 2nd stage hp turbine nozzle cooling
    • 16th stage: Engine use - hp turbine cooling
    •                  Customer bleed air
  34. GTE Fuel System Path
    • Fuel Pump
    •        -Boost element
    •        -HP element
    • Fuel Filter
    • Main Fuel Control
    • Fuel Shutdown Valves
    • Fuel Manifold
    • Fuel Nozzles
  35. Compressor Stall
               Types
    • When the aft stages of the compressor become overloaded with air, causing the airflow to stop and possibly reverse.
    • Steady State
    • Transient
  36. GT Lube Oil System
              Components
    • Lube Oil Storage and Conditioning Assembly (LOSCA)
    • Lube supply & scavenge pump
    •           1 supply element
    •           5 scavenge elements
    •                -6 scavenge elements if GTC 83 is incorporated
    • Sump pressurization and venting system
    •           8th Stage Bleed Air
    •           Air oil separator
  37. GTE Module Fire Protection
    • 3 EA - Ultra Violet Sensors (Fire Eyes)
    • 2 EA - Temperature sensors (400° F)
    • Fire Stop Push Button (manually activated at module access door)
    • After manual fire stop, 20 second delay before watchstander must manually dump C02
  38. LM2500 Start Sequence
    • Start Initiate Push Button Depressed
    • Align Start Air System [Normal (Bleed air) or Emergency (HP Air)]
    •           “START ALIGN COMPLETE” illuminated
    • PLA ordered to idle position
    •           “PLA AT IDLE” illuminated
    • Module cooling system aligned (Vent Damper opened, Cooling Fan turned on)
    •            “COOLING AIR SYSTEM READY” illuminated
    • Command Start Air Valve open.
    •           20 seconds to reach >1100 RPM (Ignition speed)
    •           90 seconds to reach idle speed 4900-5000 RPM
    •           -Timers start simultaneously
    • GG accelerates to 1100 rpm
    •           “GG AT IGNITION SPEED” illuminated
    •           Igniters turned on, Main Fuel Valves opened (FSDV)
    •                     40 seconds to reach >400° F
    •                     “IGNITION” illuminated
    • GG continues to accelerate to 4500 ± 200 RPM
    •           Self Sustaining Speed
    •                     Starter Cutout
    •                     Igniters Off
    • GG continues to accelerate to 4900-5000 RPM (idle speed)
    •           Start sequence is completed and “ONLINE” illuminates
    •           (Start Logics Reset after 5 seconds)
  39. GT Control Flow Path
    • Ship’s Control Panel (SCC)
    • Propulsion & Auxiliary Control Console (PACC)
    • Propulsion Local Control Console (PLCC)
    • Free standing electronics enclosure (FSEE)
    • Power lever actuator (PLA)
  40. Free Standing ElectronicsEnclosure (FSEE)
    • One FSEE per MER
    • Controls for both GTE’S
    • Interfaces between consoles and GTE
    • Provides PT over speed protection
    • Signal conditioner
    • Torque Computer
    • Provides over torque, over speed, and acceleration functions
  41. Power lever angle rotaryactuator (PLARA)
    One per enginePosition MFC in response to throttle movement
  42. LM2500 Start Sequence Timeline
    • 20 Seconds – GG Speed – 1100 RPM
    •      Igniters – Illuminated (on)
    •      Fuel valves – Illuminated (open)
    • 40 Seconds – PT T5.4 > 400°F
    • 45 Seconds – GTE lube oil pressure – > 6 psig
    • 90 Seconds – GG Speed – 4900 - 5000 RPM
    •      GTE Lube oil pressure - > 15 psig
    •      Fuel manifold pressure – 230 – 350 psig
    •      PT T5.4 < 1000 o F
  43. GTE Manual Stop
    • Operator monitored timer
    •      GTE at idle
    •      Operator must allow GTE to run at idle for 5 minutes
    •      Stop the GTE
    •           Closes FSDV’S
  44. GTE Manual Stop
    • Stop the GTE
    • GTE AT IDLE
    •      Starts a 5 minute timer
    •      After timer expires
    •           Closes FSDV’S
  45. GTE Emergency Stop
    • Depress Emergency Stop
    •      Closes FSDV
  46. GTM Fire Stop Sequence
    • “MODULE FIRE” at PACC and “FIRE GTE” at DCC illuminates
    • Command FSDV’s closed (shuts down GTE)
    • Command Emergency Fuel Trip Valve closed (outside of GTM, isolates engine room F/O system from GTM)
    • Command 16th Stage Bleed Air Valve closed
    • Command Cooling Fan off and Vent Damper close
    •      Flash Module Lights
    •      20 Second Timer
    • Primary CO2 released by the watchstander
  47. Unidentified GTE Stop
    • >17% PLA
    •         &
    • NPT < 100 RPM
  48. Battle Override Exceptions
    • PT Over speed - 3960 +/- 40 RPM
    • Flame out - <400ºF T5.4 < 50 psig FO
  49. Automatic GTE Shutdown
    • FSEE / ECU will automatically secure the FSDV
    • GG High Vibes – 7 mils
    • PT High Vibes – 10 mils
    • High T5.4 – 1625°F
    • Low LO Pressure - 6 psig
    • PT Over speed – 3960 +/- 40 RPM
    • Flame out
    •            <400ºF T5.4 and < 50 psig FO
    • PT Speed Signal Loss
    •            <100 RPM

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