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28 Cards in this Set
- Front
- Back
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Hydraulics Uses |
Uses -Steering/Control systems (rudder, planes) -Deck machinery (anchor windlass, capstans, winches) -Weapons Systems (loading & launching) -Elevators, presses -Masts & antennae on submarines |
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Hydraulic Theory |
-Covers physical behavior of liquids in motion -Pressurized oil used to gain mechanical advantage and perform work |
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Hydraulic Important Properties |
-Shapelessness -Incompressibility -Transmission of Force |
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Input & Output Force Calculation (Pressure) |
P1=(F1/A1) P2=(F2/A2) P1=P2 F2=(A2/A1)*F1 |
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Electrical Theory and Distribution (Generator action to induce a voltage) |
-Magnetic Field -Conductor -Relative Motion between B-Field & Conductor |
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Electrical Theory and Distribution (Motor action requires these to induce a torque) |
-Magnetic Field -Conductor -Current Flow |
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Electrical Theory and Distribution (Ship Service Motor Generators) |
-Convert AC to DC to charge the battery -Convert DC to AC to discharge the battery D--->A discharges battery* |
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Electrical Theory and Distribution (Navy Electrical Distribution system) |
*3 phase -Delivers more power than single phase -Can operate with only 2 phases- redundancy *60HZ *AC -More power than direct current for the same size machine 450 Volts: for consistency with commercial machines *Ungrounded -Reliability |
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Electrical Components Uses 1 |
Circuit Breaker -Used as switches to connect buswork -Trip open and break circuit if unsafe condition exists Fuse -Simplest protective device -Fusible strip of wire melts to provide protection -Replaced when blown
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Electrical Components Uses 2 |
Bus Transfers -Allow transfer of load from one bus to another -ABT: senses voltage quickly and auto transfers supply to alternate source to ensure continuity of power. -MBT: manual transfer, used for non-vital loads (fans, lighting) Disconnects -Used for infrequent connections |
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Compressed Air Systems: Type of Displacement |
Positive -Constant volume during a given cycle. discharged independent to discharge back pressure. -High Pressure Non Positive -Variable volume during a given cycle of operation is discharged dependent of the discharge back pressure -Low pressure applicaiton |
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Compressed Air System Uses |
High Pressure- Positive -Torpedo Ejection -Emergency Blow -Hydraulics -Remotely Operated Valves Low Pressure-Non Positive -Portable Water -Prairie Masker- reduces noise on surface warfare ships -Pneumatic Tools and valves |
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Refrigeration and Air Condition Systems Diagram |
*Counter Clock-wise motion A-Expansion Device -High pressure, sub-cooled liquid B-Evaporator -Low Pressure, Wet vapor C-Compressor -Low Pressure, Super-Heated Vapor D-Condenser & Reciever -High Pressure, Super-Heated Vaport |
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Refrigeration Components |
Evaporator/Chiller -absorbs heat from surroundings -slightly superheated Compressor -increases pressure to allow for condensation at warmer temp. Condenser -refrigerant rejects latent heat Receiver -Temp. storage space & surge volume for sub-cooled refrigerant -Serves as a vapor seal Thermostate Expansion Valve -Controls pressure reduction of refrigerant -Controls amount of refrigerant entering the evaporator -Senses temperature of the discharge end of an evaporator/ chiller |
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Types of AC systems |
Self-Contained System - Add-on to ships that originally did not have AC plants -Not located in ventilation system Refrigerant circulating System -Hot air passed over refrigerant cooling coils directly Chilled water circulating system -refrigerant cools chill water -hot air passes over chill water cooling coils
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Engineering Documentation |
Naval Ships' Technical Manual -provides general interest information to entire fleet Ship Information Book -Specific ship information generated by the shipyard who build the ship Equipment Technical Manuals -specific information and instructions for individual equipment Blueprints and Drawings -Microfiche & paper from Used for piping systems, wiring diagrams, & dry docking plans Engineering Operational Procedure -Instructions and guidelines for completing all casualty conditions Engineering Operational Casualty Control |
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Types of Logs |
-Engineers Bell Log -Engineering Logs -Fuel Oil Water Report -Engineering Officers Night Orders Book -Water Chemistry Records -Watch Station Operating Logs |
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Process for Commencing Maintenance |
-One person identifies scope and writes tags to isolate boundaries -Second Person independently verifies the scope of work and ensures the tags adequately isolate the work boundaries -Either of the two petty officers will prove the tags to a watch or duty officer. An officer verifies the tags are administratively correct, safely isolates the work site, and is adequate for the maintenance to be completed. |
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Process for Commencing Maintenance Part 2 |
-One qualified petty officer places valves, breakers, etc, in correct position. hangs tag and signs each tag. -a second qualified petty officer verifies that the tags are hung in correct places and that the valves, breakers, etc. are in correct position, then signs each tag -the officer receives the report that the tags are fully hung and completes the administrative process. Work can then be authorized. -Once work is complete and the system is restored, an officer authorizes the removal of the tags and a petty officer physically removes each tag. |
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Types of Tags |
Danger -used when safety would be jeopardized -prohibits operation to which tag is attached -used on mechanical or electrical systems Caution -Tag conveys amplifying information or special instructions to ensure safe operation. |
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Ship Design- Types of Forces |
Sagging -Condition where ship is supported more at its ends -compression of main deck Hogging -Ship supported in middle -Tension of main deck -compression of bottom/keel |
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Ship Design- Structural Elements |
Keel -Centerline backbone of ship -Runs length of ship Framing -Ribs of ship, provide structural strength Plating -Skin over framework, rectangular steel plates welded together Bulk head -Walls of ship -Horizontal partitions that form compartments -Can either be structural or non structural |
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Compartment Numbering |
4 main parts Deck - Upper levels 01 - Main Deck 1 - Lower levels 2,3,4 Frame -forward boundary of compartment is on or immediately aft of this frame. -Sequential number given to transverse frames fore to aft. Compartment -Indicates position of compartment relative to center line -Centerline compartments are "0" -Numbers follow in succession from centerline outboard -Even Numbers for Port side (2,4,6) -Odd Numbers for Starboard side (1,3,5) |
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Damage Control -Standard Damage Control Report
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MIC Assistance needed Injured Personnel Damage Personnel Damaged Equipment
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Types of Fire and preferred method of extinguishing agent/method |
Alpha- Paper/Wood... Ash... Water, any Bravo-Oil/fuel... Dark AFFF Charlie-Electrical Equipment De-energize then CO2/PKP Delta-Metal/ Jettison or flood |
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Damage Control Equipment |
Emergency Air Breathing -Breathing device that plugs into ship's air -Essentially unlimited air supply -must unplug/ replug each time you move SCBAs -Self-Contained breathing apparatus -30 to 45 minutes of air NFTI -Used by fire fighters -battery powered thermal imaging device -Provides sight in poor visibility -Provides indication of hot spots Fire Fighting Ensemble -Flame/ heat retardant -Full body suit to prevent skin exposure -Worn in conjunction with SCBA |
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Buoyancy & Stability |
FreeBoard- Vertical distance from waterline to main deck. Displacement- Total weight of ship= Total submerged volume of ship Draft- Vertical distance from waterline to keel at deepest point Reserve Buoyancy -Volume of watertight portion of ship above waterline (important factor in ship's ability to survive flooding) |
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Archimedes Principle |
Law: a body floating or submerged in a fluid is buoyed up by a force equal to the weight of the water in displaces Ws=mg ph2o*v=B (buoyancy) Ws=p*v20
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