Marine Propulsion Systems Overview
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Questions and Answers

When is the electric/standby pump used in the CRP system?

  • When the system is first turned on and operating below 90 gpm (correct)
  • When the system is operating at an idle speed and the attached pump is not required
  • During emergency operations when the primary pump fails
  • When the MRG is in operation but the attached pump is not
  • What is the primary function of the OD Box in the CRP system?

  • To control the position of the propeller blades by regulating oil pressure (correct)
  • To control the direction of rotation of the propeller shaft
  • To distribute hydraulic oil to the head tank
  • To monitor the temperature of the hydraulic oil
  • What happens to the hydraulic oil in the HOPM?

  • It is mixed with seawater to create a cooling fluid
  • It is divided into control oil and power oil for different functions (correct)
  • It is used to lubricate the propeller shaft
  • It is compressed to provide power to the emergency hydraulic pump
  • What is the purpose of the head tank in the CRP system?

    <p>To provide static head pressure on the hub while the system is secured (A)</p> Signup and view all the answers

    Under which condition would the emergency hydraulic pump be used?

    <p>If the pitch cannot be set with the change-over valves in the manual or auto position (C)</p> Signup and view all the answers

    What is the main purpose of the Main Reduction Gear (MRG)?

    <p>To convert high speed, low torque input into low speed, high torque output (B)</p> Signup and view all the answers

    What type of gear system is used in the MRG?

    <p>Double input, double reduction, double helical gears (C)</p> Signup and view all the answers

    How many line shaft bearings are located on the starboard shaft?

    <p>Two (C)</p> Signup and view all the answers

    What is the purpose of the Power Turbine Brake (PT Brake)?

    <p>To hold the power turbine stationary until the engine is placed online (D)</p> Signup and view all the answers

    Where is the starboard Main Thrust Bearing located?

    <p>Aux2 (B)</p> Signup and view all the answers

    What are the two methods to inflate the inflatable shaft seal in case of seawater leakage?

    <p>LP Air and CO2 (D)</p> Signup and view all the answers

    What is the primary purpose of the Bulkhead Seals?

    <p>To prevent flooding from Aux and Main spaces (D)</p> Signup and view all the answers

    Under what conditions is the Brake Mode activated in the GTM?

    <p>Only in emergency conditions (A)</p> Signup and view all the answers

    Flashcards

    Controllable Reversible Pitch Propeller (CRP)

    A propulsion system that changes propeller blade pitch for thrust without altering shaft rotation direction.

    Hydraulic Oil Power Module (HOPM)

    A component that divides hydraulic oil into control and power oil for the CRP system.

    Oil Distribution (OD) Box

    Controls blade position by directing high-pressure hydraulic oil to the hub.

    Emergency Hydraulic Pump

    Activates when pitch can’t be controlled by normal means, setting it to a predetermined angle.

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    Electric/Standby Pump

    A backup pump that starts automatically at 90 gpm and stops at 120 gpm during operations.

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    Main Reduction Gear (MRG)

    Converts high speed, low torque input to low speed, high torque output for propellers.

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    Double Input

    MRG receives input from two engines simultaneously.

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    High Speed Flexible Coupling Shaft (HSFCS)

    Connects main engines to the MRG allowing flexibility and motion transfer.

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    Synchronizing Self-Shifting (SSS) Clutch

    Engages/disengages engines to the MRG for operation or stoppage.

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    Power Turbine Brake (PT Brake)

    Holds power turbine stationary until engine is activated.

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    Main Thrust Bearing

    Absorbs axial thrust and transmits it to the ship's hull.

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    Stern Tube Seal

    Prevents seawater from entering the ship and cools the shaft.

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    Bulkhead Seals

    Prevents flooding where shafts penetrate hull spaces; located at critical points.

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    Study Notes

    Main Reduction Gear (MRG) and Shaft-ing

    • Purpose: Converts high-speed, low-torque input from the GTMs to low-speed, high-torque output for the shaft and propeller.
    • Physical Description:
      • Double input (two engines).
      • Double reduction (speed reduced twice).
      • Double helical, V-shape gears (better thrust, reduce noise).
      • Single output (one shaft).
      • Articulated.
      • Locked train (all gears rotate together).

    High Speed Flexible Coupling Shaft (HSFCS)

    • Connects main engines to the MRG.

    Synchronizing Self-Shifting (SSS) Clutch

    • Located on the MRG (port and starboard sides).
    • Purpose: Engage and disengage main engines to the MRG.
    • Operation: Engages when engines are rotating at higher speeds, disengages at lower speeds.

    Power Turbine Brake (PT Brake)

    • Holds power turbine stationary until engine is online.
    • Purpose: Used in emergency conditions.
    • Operation: Decreases GTM speed to idle and engages at 2200 rpm.

    Main Thrust Bearing

    • Absorbs axial thrust from the shaft and transmits it to the ship's hull.
    • Each MRG has its own thrust bearing (starboard in Aux2, port in shaft alley).

    Line Shaft Bearing

    • Supports radial support of the shaft.
    • Starboard shaft has two bearings (1A in MER2, 1B in shaft alley).
    • Port shaft has one bearing (2A in shaft alley).

    Strut Bearing

    • Supports the weight of the shaft and provides radial support.
    • Located outside the ship's hull aft of the shaft alley. Each shaft has a strut bearing.

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    Description

    Explore the essential components of marine propulsion systems, focusing on the Main Reduction Gear (MRG), High Speed Flexible Coupling Shaft, Synchronizing Self-Shifting Clutch, and Power Turbine Brake. This quiz will help you understand the mechanics and functions behind these critical systems in marine engineering.

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