Machinery Control System and Gas Turbines Overview
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Questions and Answers

What is the purpose of the FOD screen in the intake system?

  • To regulate the flow of air into the engine.
  • To reduce noise from the engine.
  • To filter out large debris before it reaches the engine. (correct)
  • To cool the intake air before it reaches the engine.

    • In the fire detection and extinguishing system, what is the role of the temperature sensors?

  • To regulate the flow of cooling air to the engine.
  • To detect flames and activate the fire suppression system.
  • To activate the alarm when the engine temperature exceeds a certain threshold. (correct)
  • To monitor the temperature of the Halon bottles.

    • What is the primary function of the Engine Controller (EC)?

  • To regulate the air pressure in the intake system.
  • To control the flow of fuel to the engine.
  • To monitor the engine's performance and control its various systems. (correct)
  • To maintain the oil temperature in the LOSCA.

    • How many gallons of oil does the LOSCA typically contain?

    <p>19 gallons (D)</p> Signup and view all the answers

    What type of fuel is used in the propulsion turbines?

    <p>Navy Distillate MIL-F-16884 (NATO F-76) or JP-5 per MIL-T-5624 (NATO F-44) (D)</p> Signup and view all the answers

    What is the primary function of the Gas Generator in the LM2500 gas turbine engine?

    <p>To compress ambient air to a high pressure. (B)</p> Signup and view all the answers

    How many fuel service systems are there?

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

    What are the two types of fuel oil service tanks in each engine room?

    <p>Gravity feed tanks and service tanks (B)</p> Signup and view all the answers

    How many UCC workstations are there on USS Ralph Johnson, and where are they located?

    <p>4 UCCs: 2 in CCS, 1 in MER1, and 1 in MER2. (C)</p> Signup and view all the answers

    What is the purpose of the fuel pre-filters and fuel filter/separators?

    <p>To remove impurities and water from the fuel. (D)</p> Signup and view all the answers

    What is the purpose of the resilient mounting of the GTM modules on USS Ralph Johnson?

    <p>To reduce the impact of shipboard vibrations and noise on the modules. (B)</p> Signup and view all the answers

    What is the primary function of the Power Turbine in the LM 2500 gas turbine engine?

    <p>To extract thermal energy from expanding gases and convert it into mechanical energy to rotate the shaft. (C)</p> Signup and view all the answers

    What is the maximum horsepower output of a single LM 2500 gas turbine engine?

    <p>26,250 horsepower (D)</p> Signup and view all the answers

    What is the purpose of the intake system in the GTM?

    <p>To furnish ambient air and cooling air to the GTM. (B)</p> Signup and view all the answers

    What type of fire extinguishing system is used to protect the GTMs on USS Ralph Johnson?

    <p>Halon 1301 system (C)</p> Signup and view all the answers

    What network does MCS use for data transfer between Engineering Plant user controls?

    <p>GEDMS (D)</p> Signup and view all the answers

    Flashcards

    Intake System

    Consists of inlet ducts, filters, silencers, and a FOD screen for air intake and cooling.

    Fire Detection System

    Uses temperature sensors and flame detectors to monitor for fire and activate alarms.

    Automatic Fire Stop

    Triggered by fire detection systems to extinguish fire in the engine.

    Extinguishing System

    Comprises Halon discharge nozzles and bottles to suppress engine fires.

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    Engine Controller (EC)

    A computer-based controller managing inputs and outputs for the LM2500 engine.

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    Lubricating Oil Storage/Conditioning Assembly (LOSCA)

    Contains an oil tank and filtration system to provide clean oil for the engine.

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    Fuel Oil Service System

    Supplies clean, filtered, and water-free fuel to propulsion and generator turbines.

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    Fuel Transfer System

    Operational setup for managing and transferring fuel within the engines.

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    Machinery Control System (MCS)

    A system controlling plant automation using the Gigabit Ethernet Data Multiplex System for data transfer.

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    Universal Control Console (UCC)

    A workstation capable of performing multiple control roles in ship operations.

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    Gas Turbine Module (GTM)

    Enclosure that houses a gas turbine, providing support, cooling, and noise reduction.

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    LM2500 Gas Turbine Engine

    A gas turbine engine capable of producing 26,250 horsepower found in the GTM.

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    Gas Generator

    Part of the GTE that compresses ambient air to about 130-150 psi.

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    Combustor

    The part of the gas turbine where fuel and air mixture is ignited to create thermal energy.

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    Power Turbine

    Extracts thermal energy from hot gases to produce mechanical energy for ship propulsion.

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    Study Notes

    Machinery Control System (MCS)

    • DDG-51 class uses aircraft derivative gas turbines for propulsion and electrical power generation
    • Plant automation controlled by MCS
    • MCS uses Gigabit Ethernet Data Multiplex System (GEDMS) for communication between Engineering Plant user controls (e.g., Bridge, CIC)
    • Universal Control Consoles (UCC) can function in various roles, including Central Control Single Watchstander (CCSW), Propulsion Auxiliary Control Console (PACC), Electrical Plant Control Console (EPCC), and Shaft Control Units (SCU1/2)
    • Four UCCs exist, two in Central Control Station (CCS), one in Machinery Error Room 1 (MER1), and one in MER2
    • All UCCs are interchangeable and perform the same functions

    Gas Turbine Module (GTM)

    • Four GTMs on USS Ralph Johnson, two per main engine room
    • GTM enclosures support, cool, reduce airborne noise, and provide fire protection for the turbines
    • GTMs are resiliently mounted to reduce structure-borne noise and vibration shock
    • Two GTMs in each Main Engine Room (MER) are protected by a primary and reserve Halon 1301 fire extinguishing system

    LM2500 Gas Turbine Engine (GTE)

    • General Electric LM 2500 produces 26,250 horsepower
    • GTE consists of a gas generator (compressor), combustor, and high-pressure and power turbines
    • Compressor increases ambient air pressure to approximately 130-150 psi
    • Combustor ignites fuel/air mixture to create thermal energy
    • High-pressure turbine extracts thermal energy, converting it into mechanical energy to rotate the compressor and accessories
    • Power turbine converts remaining energy into mechanical energy to rotate the main shaft

    Intake System

    • Furnishes ambient air from outside the ship to each GTM
    • Includes louvers, air filters, blow-in doors, silencers, and an inlet plenum with a foreign object debris (FOD) screen
    • Provides cooling air to the GTM
    • Cooling air is extracted through the intake system through a cooling fan

    Fire Detection and Extinguishing System

    • Temperature sensors and flame detectors
    • Temperature sensors trigger an alarm at 450+-10 degrees
    • Flame detectors detect UV light from a fire
    • System activates automatic fire stop for the engine.
    • Halon discharge nozzles and two Halon bottles for extinguishing fire
    • One is for primary and one for reserve

    Engine Controller (EC)

    • High-performance computer-based controller for the LM2500 engine
    • Controls all inputs and outputs from the engine
    • Each engine has its own EC essentially the brain of the engine

    Lubrication Oil Storage/Conditioning Assembly (LOSCA)

    • Consists of an oil tank with approximately 19 gallons of synthetic lubricant oil 23699
    • Has a duplex scavenge filter and heat exchanger which uses the ship's reduction gear lube oil as a cooling medium for the oil

    Fuel Oil Service System

    • Supplies clean, filtered, and water-free fuel to propulsion and generator turbines
    • Uses MIL-F-16884 (NATO F-76) or JP-5 (NATO F-44)
    • System includes:
      • 4 fuel oil service tanks
      • 2 gravity feed tanks
      • 1 fuel head tank for 3GTG
      • motor operator service and return valves
      • emergency quick closing fuel valves
      • various numbers of motor-operated fuel pumps, electric fuel heaters, pre-filters, and separators.
      • Fuel unloading valves

    Fuel Transfer System

    • Primary storage provided by 25 structural fuel tanks divided into six tank groups
    • Each group has receiving tanks, storage tanks, and expansion/overflow tanks.
    • Transfer systems consist of a pump, purifier, and heater
    • These fuel tanks are seawater compensated to maintain equilibrium of the ship

    JP-5 Transfer and Service System

    • Normal fuel source for ship's helicopters
    • Also used in emergencies for GTMs and GTGs
    • System consists of:
      • Aircraft refueling hose, transfer pump, service pump, transfer and service filters, stripping pump
      • storage and service tanks (including one with a service pump)
      • Additive di-ethylene-glycol-monomethyl-ether (DiEGME) for preventing freezing in extreme altitudes

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    Related Documents

    MCS, GS, FO Fundamentals, ESWS Guide PDF

    Description

    This quiz focuses on the Machinery Control System (MCS) and Gas Turbine Modules (GTM) used in the DDG-51 class ships. It explores the functionalities of Universal Control Consoles and the structure of GTMs, highlighting their roles in propulsion and power generation. Test your knowledge on the integration of automation and gas turbines in naval engineering.

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