CPP

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The flashcards below were created by user pascual on FreezingBlue Flashcards.


  1. How does water get into the L/O system? What about CPP specifically?
    • Since the purifiers use potable water, some water can leak into the system that way.
    • If propeller seals are worn sea water can get into the CPP system, especially in-port or when the shaft is locked.
  2. What to do when CPP/2190 oil sample is hazy?
    • Conduct hot bath
    • If it still fails, identify cause
  3. Prior to starting CPP, what should be the thrust mode and pitch?
    • “M DISENGA”
    • “0” pitch
  4. What is a HOPM?
    Hydraulic Oil Power Module
  5. Why should the servo supply bypass valves (1-PHS-V-28, 2-PHS-V-28) be opened prior to system startup?
    • Incase the setting of the HOPM relief valves have been altered
    • After system startup up and after ensuring proper relief valve setting, valves should be closed
  6. What is the HUB pressure?
    50-800 psig
  7. What is the AUX Servo pressure?
    325-350 psig
  8. What makes up the CPP Hydraulic System?
    HOPM, OD Box, Propeller Hub, CPP Head tank, Gear Driven hydraulic oil pump, an electric motor driven standby hydraulic oil pump
  9. What is the emergency pitch used for?
    To manually move the valve rod and propeller hub blades to a fixed position
  10. What are the 5 major valves in CPP?
    • 2 check valves
    • 1 pilot operated unloading valve
    • 1 main relief valve
    • 1 sequence valve
    • 1 aux servo
  11. Where are pressure reducing valve and aux servo relief valve located?
    On the HOPM.
  12. What is the by-pass valve for?
    The bypass valve must be open during system start-up or emergency operation. However, when the CP system is operating in remote or local manual operation mode, the bypass valve must be closed.
  13. What is the valve rod?
    The valve rod is a mechanical link between the aux servo piston and the regulating valve pin and liner in the hub. It also serves as a passage to transmit high-pressure hydraulic power oil to the hub piston. The valve rod moves axially fore and aft when control oil changes the position of the aux servo piston. The movement of the valve rod changes the position of the regulating valve pin in relationship to the liner, and hydraulic power oil is allowed to flow into the hub. The return oil from the hub flows back through the bore of the shaft around the outside of the valve rod. Guides inside the propeller shafting support the valve rod.
  14. What is the cross-head?
    The axial movement of the crosshead causes rotary movement of the crank pin rings. This rotary movement is transmitted to the propeller blades.The blade is bolted to the crank pin ring and turns with it. This configuration allows the axial movement of the crosshead to transfer rotary motion to the crank pin rings. The propeller blades are mounted over the crank pin rings and are directly affected by any rotary motion of the crank pin rings.
  15. What is the purpose of the head tank?
    Maintains pressure on the system in port to prevent seawater intrusion.
  16. What is CPP sump Capacity?
    500 gl
  17. What is CPP sump operating level?
    300-400 gl
  18. What is CPP sump Low and High Alarms?
    • Low - 225
    • High – 425
  19. Which systems have logics?
    • CPP
    • M/E L/O
    • MRG L/O
    • VCHT
  20. Why is CPP different?
    Because the 2190 is used as hydraulic oil vice lubricating oil.
  21. What happens if after 48 hours the results do not improve? (or even get worse)
    • perform a detailed inspection of the CPP system to determine the source of contamination.
    • Continue system purification for the maximum hours per day possible and monitor results until conditions improve.
    • A message report needs to be sent and outside tech assists may be requested.
  22. MPDE: What is the maximum/alarm CPP oil temperature?
    • Max - 130 F
    • Low – 68 F
    • Hi – 158 F
  23. MPDE: What is the CPP sump level?
    300-400 gl
  24. MPDE: What is the CPP sump level alarms?
    • Low – 225 gl
    • Hi – 425 gl
  25. MPDE: What is the HUB oil pressure?
    50-800 psi
  26. MPDE: What is the HUB oil pressure alarm?
    750 psi
  27. MPDE: What is the aux servo pressure?
    325-350 psi
  28. MPDE: What is the aux servo low pressure alarm?
    200 psi
  29. MPDE: What is the maximum pitch?
    120%

Card Set Information

Author:
pascual
ID:
323874
Filename:
CPP
Updated:
2016-09-29 19:01:41
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EOOW
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Description:
CPP
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