Steering Methods and Components Overview
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Questions and Answers

What is the primary purpose of the Hydraulic Power Units (HPUs)?

  • To automate navigation tasks
  • To control the engines of the ship
  • To provide power to move the rudders (correct)
  • To monitor fuel levels
  • Where are the Local Control Units (LCUs) located?

  • Near the bridge of the ship
  • Against the forward bulkhead in Compt. 4-442-0-E (correct)
  • At the stern of the ship
  • Inside the engine room
  • What happens when the Emergency Manual mode is activated?

  • It overrides the automatic navigation system
  • It generates signals that allow for a control transfer (correct)
  • It sends all signals directly to the GEDMS
  • It immediately shuts down the steering systems
  • How many hydraulic Rams are utilized, and what is their purpose?

    <p>Two, to rotate the rudders through hydraulic fluid movement (C)</p> Signup and view all the answers

    What is the function of the Fill and Drain Electric Pump?

    <p>To transfer fluid for the steering gear machinery (D)</p> Signup and view all the answers

    In Computer Assisted Manual mode, how are helm orders managed?

    <p>All helm orders traverse through GEDMS to the LCU (B)</p> Signup and view all the answers

    What is the function of the Emergency Steering Hand Pumps?

    <p>To manually steer one rudder after a significant system failure (C)</p> Signup and view all the answers

    Which of the following statements is true regarding the Backup Manual steering control?

    <p>Sends helm signals directly to the LCU's bypassing GEDMS (B)</p> Signup and view all the answers

    What is the purpose of the chilled water system onboard the ship?

    <p>To supply 44° chilled water for cooling various onboard systems (C)</p> Signup and view all the answers

    Where are the 1.5 ton R-134a York rotary refrigeration units located?

    <p>On the reefer decks next to the chill and freeze box (C)</p> Signup and view all the answers

    What is the function of the pulper in the trash room?

    <p>To shred biodegradable material for overboard disposal (D)</p> Signup and view all the answers

    What type of distilling plant is used onboard the ship?

    <p>Reverse Osmosis Distilling Plant (B)</p> Signup and view all the answers

    What is the maximum daily distilling capacity of the Reverse Osmosis Distilling Plant?

    <p>12,000 gallons per day per unit, totaling 24,000 gallons (A)</p> Signup and view all the answers

    What is the main action performed by the CMU in the trash room?

    <p>Compresses and forms plastic into compact pucks (B)</p> Signup and view all the answers

    How does the chilled water system interface with the electronic cooling skids?

    <p>Acts as a cooling medium for the de-mineralized water (C)</p> Signup and view all the answers

    What is the primary purpose of the chilled water pumps onboard the ship?

    <p>To move chilled water throughout the ship (B)</p> Signup and view all the answers

    Flashcards

    Steering Methods

    Various methods to control a ship's steering include SCC, ASU, LCU's, FADPU, Emergency Hand Pump.

    Hydraulic Power Units (HPUs)

    Four HPUs provide power to move the rudders for steering.

    Local Control Unit (LCU)

    Four LCU's are found in the fwd bulkhead of Compt. 4-442-0-E for each HPU.

    Rams Function

    Two Rams move hydraulic fluid to rotate rudders through the Rapson slide linkage.

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    Emergency Steering Hand Pumps

    Located between 1A and 1B HPU, they allow manual steering with 30 turns = 1 degree.

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    Computer Assisted Auto

    An autopilot mode that allows entering heading orders for normal operation.

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    Backup Manual Control

    Manual control of rudders using the steering wheel assembly, bypassing GEDMS.

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    Emergency Electric Steering

    Uses FDPU's electric motor-driven pump for filling, flushing hydraulic oil for emergency steering.

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    Air Conditioning Plants

    5-200 ton R-134a York centrifugal A/C units are onboard the ship, located in various areas including Aux 1, Aux 2, and Shaft Alley.

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    Chilled Water Pumps

    Pumps located in Aux 1, Aux 2, and Shaft Alley, responsible for moving chilled water throughout the ship.

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    Expansion Tanks

    Three tanks located in Aux 1, Aux 2, and Shaft Alley, used to accommodate the expansion of chilled water in the system.

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    Chilled Water System

    The largest system on the ship, supplying 44° chilled water for various equipment and returning warmed water to AC plants for re-cooling.

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    Refrigeration Units

    Two 1.5 ton R-134a York rotary refrigeration units located on Reefer decks, used for cooling spaces and products.

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    Trash Room Equipment: Pulper

    Shreds biodegradable material from the trash room and disposes it overboard beyond 3 nautical miles.

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    Distilling Plant Type

    Reverse Osmosis distilling plant with a maximum capacity of 12,000 gallons per day per unit, totaling 24,000 gallons daily.

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    Operation of Distilling Plants

    Feedwater is drawn from the fire main system and processed through filters to the RO module for seawater distillation into potable water.

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    Study Notes

    Steering Methods

    • Steering methods include Computer Assisted Auto, Computer Assisted Manual, Backup Manual, and Emergency Manual.
    • Computer Assisted Auto functions like automatic pilot, allowing personnel to input heading orders, and is the normal configuration.
    • Computer Assisted Manual mode allows operators at the SCC or ASU to manually control the rudders via a manual steering wheel, with commands passed through GEDMS to the LCUs.
    • Backup Manual mode lets operators initiate rudder orders using the manual wheel at the SCC or ASU, depending on the controlling station, with helm signals going directly from the station to the LCUs, bypassing GEDMS.
    • Emergency Manual mode is discussed, but no details are provided.

    Steering Components

    • Four Hydraulic Power Units (HPUs) power the ship's rudders.
    • Four Local Control Units (LCUs) are situated against the forward bulkhead in compartment 4-442-0-E (aft steering).
    • Rams and Follow Up Assemblies position the rudders using hydraulic fluid.
    • Emergency steering hand pumps are located between HPU 1A and 1B, in aft steering. 30 turns of the pump equals 1 degree of rudder movement (per pump).
    • Fill and Drain Electric Pumps position fluid from storage to all HPU head tanks and provide emergency steering to a single rudder.

    Additional Information

    • The location of the different steering components and systems are detailed.
    • The functioning of the components for steering, along with the different ways of controlling the ship's steering are discussed.

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    Description

    This quiz covers the various steering methods used in marine navigation, including Computer Assisted Auto, Computer Assisted Manual, Backup Manual, and Emergency Manual modes. Additionally, it discusses the hydraulic components that enable the ship's rudders to function effectively, such as Hydraulic Power Units and Local Control Units.

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