Engineering Flashcards
ENG
What type of fuel does the FCB use?
Diesel Fuel Marine (DFM) also known as F-76
What is the location of the Fuel Oil storage tanks?
8th deck frames 12 to 123
What type of boilers and where are they located?
2 600 PSI D-type located in the fire room
Superheater
Heats steam above saturation temperature (750-875 degrees)
Economizer
It is where feedwater enters the boiler.
Preheats the feedwater by 100-200 degrees.
One per boiler.
Steam Drum
Directs boiler water through the boiler.
Steam exits and goes to the superheater.
Water Drum
Receives water from the steam drum via downcomers.
Contains the de-superheater which produces auxillary steam.
What does the furnace do?
The furnace is where the fuel is burned to produce heat for generating steam.
Steam is generated in the rear wall, side wall and screen wall tubes.
Combustion gases are directed through backs of tubes including superheater, generating, and economizer tubes.
Soot Blowers
Uses steam to blow soot off boiler tubes.
7 soot blowers per boiler.
Turbine Forced Draft Blowers
There are 4 total
o 2 steam driven force draft blowers per Boiler.
o They provide combustion air for the boilers.
o They are steam driven and uses the 600 PSIG AUX STEAM
Light Off Blower
o There are 2 total
o 1 electric driven force draft blowers per Boiler.
o They provide combustion air for the boilers.
o Electric driven Force Draft Blower is for Startup of Boiler.
Boiler Safety Valve
o Protects the boiler from over-pressurization.
o Each boiler has three safety valves and one pilot valve.
o 2 steam drum boiler safety valves
o 1 superheater boiler safety valve.
Chelant Boiler Water Treatment System
o Continuously injects chemicals into the boiler to maintain boiler water chemistry through the DFT.
o It also has continuous blowdown to rid the boiler of contaminants.
o Aides in the de-aeration process of feedwater, coats the internal piping and boiler tubes minimizing the possibility of corrosion and rust build up.
o Poor boiler chemistry will cause failure of the boiler tubes.
DFT - De-aerating feed tank
o Stores Feed Water o Preheats condensate o De-aerates condensate o Maintained at 15 psi and 250 Degrees o Separates the condensation and feed phases.
Main Feed Pumps
o There are 2 turbine driven pumps
o Purpose is to increase pressure to 800 psi, (approximately 150-200 psi above boiler operating pressure).
Main Feed Booster Pump
o There are 3
o Gravity Fed from the DFT
o Maintains a positive static/suction head.
o Continuously pumps water to the Main Feed Pump.
Feedwater Control Valve
o Automatic Feed Water Control Valve works automatically with LP air. If LP air fails the valve will fail in the open position.
o Manual Feed Water Control Valve is used in the event of failure of the Automatic Feed Water Control Valve.
o They Regulates amount of feedwater going into the economizer.
What is the operating pressure of the boilers?
600 PSI
Fuel Oil Closing Valve
o A pneumatic valve that secures fuel flow to the boiler.
o Each boiler has its own FOQCV
o Black Smoke- There is too much fuel in the mixture and you have 2 minutes to shut off the boiler before it blows
o White Smoke- There is too much air and you have 1 minute to shut off the boiler before it blows
Combustion Control
o Regulated by LP air
o When a change in air flow is needed, the blowers will speed up or slow down as necessary.
Airlock
o A safety system that protects the automatic controls of the boiler in case of loss of air pressure
o It locks in the last signal to the forced draft blower, the feedwater control valve, and the fuel oil control valve
o This allows the watch team time to safely shift the boiler into manual control
Lube Oil Service Pumps
Pumps oil through the system.
Lube Oil Cooler
Maintains lube oil temperature between 120 and 130 degrees.
Lube Oil Strainer
Removes debris from the lube oil as it is pumped
Lube Oil Purifier
o Removes sediment and water from lube oil
o Duval type
Lube Oil Storage Tanks
o L/O storage is used to store clean lube oil for future use.
o Settling tanks separate water and sediment from lube oil by heating the oil and allowing contaminants to settle.
Location of L/O Storage Tanks
The lube oil storage tanks / Cooler are in the engine room.
Propeller
18’ with six blades
4 Parts of the Shaft
o Thrust Shaft
o Line Shaft
o Stern Shaft
o Tail Shaft
Main Thrust Bearing
Provides axial movement of the main shaft.
Line Shaft Bearing
o Holds and supports the weight of the entire shaft.
o Cools and lubricates with lube oil (2190)
Main Reduction Gear
Converts high speed low torque from the Turbine to low speed high torque to turn the Shaft and move the ship through the water.
Stern Tube Seal
o Seals off the Bulkhead (keeps water from coming in the back end of the ship)
o 2 types of stern tube seals (Rubber Lip and Mechanical Face)
Strut Bearing
o Holds and supports the weight of the Propeller
o Cools and lubricates with sea water
Jacking Gear
o Slowly turns over the turbines, reduction gear, shafting and screw.
o Used for warming and cooling of the main engine.
Main Condenser
o Condenses Steam into condensate using Seawater as cooling medium.
o single pass heat exchange
o Contains 2000-1000 tubes.
o Maintained under a vacuum of 28” HG
Main Air Ejector
o Removes air and non-condensable gases from the main condenser
o Sends that water to back to the DFT
o Also helps maintain the vacuum of the Main Condenser
Guarding Valve
o An isolation valve prior to the throttle valves.
o Provides double valve protection for the HP and LP turbines.
o Can be used in an emergency to control steam flow.
Ahead Throttle
Used to control the amount of steam going to the turbine while the ship is going in the forward direction.
Astern Throttle
Controls the amount of steam going to the throttle while the ship is going in the astern direction
Electro Hydraulic Steering Unit
o There are two Electro/Hydraulic Pumps
o One port and one Starboard
o One runs at a time for 24hrs
o The port runs on even days and the Starboard runs odd days
5 Ways to Steer the Ship
Helm Locally by the Trick Wheel Emergency Hand Pump Chain Fall Assembly Ratchet Ball Assembly
SSTG
o Provides Power for the ship
o There are 4 located in the engine room
Capacity of SSTG
o 1200 RPM o 4009Amps o 2500KWatts o 450Volts 3 Phase 60Hertz o Runs off Main Steam (600psig)
Shore Power
o 400 AMP (per cable)
o 450 Volt (per cable)
o Frank Cable requires 8 shore power cables for itself
EDG
o 1 Fairbanks Morris 38ND 8 cylinders 16 pistons opposed piston.
o Provides emergency power in the event of SSTG Failure or Loss of Steam.
Location of EDG
Located 2nd deck (2-59-2) aft of galley and forward of ships store.
Jacket Water
Used to cool the engine
Lube Oil
Lubricates and cools gears, pistons, bearings, shaft and crankshaft
Fuel Oil
Fuels combustion (DFM F-76)
Air Start/Assist
Used to turn over the engine during start up (HP air reduced to 200 PSI)
Saltwater
Used to cool the jacket water and lube oil
Capacity of EDG
o 1604 Amps
o 1000 Kilowatts
o 440 Volts 3 Phase 60Hertz
o Runs on DFM F-76 fuel oil.
Emergency Shutdown
o Trips the fuel rack cutting off fuel.
o The trip is located on the engine with a remote trip outside the entrance.
Over-speed Trip
Shuts down the engine in the event of an over-speed
Govenor
Maintains 900 RPMs on the engine during all load changes (constant speed, variable load)
A/C Units
o There are three 250 ton centrifugal type compressors
o Uses R-236FA refrigerant
o Provides Chill water to the overhead A/C Units (not the SCACs – Self Contained A/C)
o Located in the Engine Room
Refer Units
Refer Units
o There are three 8 ton reciprocating type compressors
o Uses R-134 refrigerant
o Located below the Galley
Ac&R Cycle
o Compression
o Condensation
o Expansion
o Evaporation
4 Modes of CHT
o Off
o In port mode
o Transit mode
o At sea mode
HPAC
o There are 3
o They maintain 3000 PSIG.
o Located in the Fireroom
o Provide HP air for ships whistle, EDG air flask and dive chamber
LPAC
o There are 3
o They maintain 115-125 psig.
o Provide air to the automatic boiler Controls (ABC), and pneumatic tools.
