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systems test 1 > EDM > Flashcards

EDM Flashcards

emergency Diesel Mechanical

1
Q

STATE the number of cylinders, continuous load rating, and operating speed of Seabrook’s emergency diesel (DG) engines

A
  • 16 cylinders
  • 514 rpm
  • 6083 kW
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2
Q

EXPLAIN the operations which occur in a cylinder during the DG four stroke cycle

A
  • INTAKE (Induction)
  • COMPRESSION
  • POWER
  • EXHAUST
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3
Q

LIST the five major mechanical support systems associated with the DGs

A
  1. Starting and Control Air System
  2. Intake, Exhaust and Crankcase Vacuum Systems
  3. Fuel Oil System
  4. Lube Oil System
  5. Cooling Water System
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4
Q

STATE the purpose of the DG starting air system

A

To air start the EDG

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5
Q

DESCRIBE the operation of the DG starting and shutdown air system component Air Receivers

A
  • 2 parallel receivers sized to allow for 5 engine starts
  • If one should fail, the other can start the diesel twice.
  • Pressure is automatically maintained between 560 and 600 psig by the Main Air Compressor
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6
Q

DESCRIBE the operation of the DG starting and shutdown air system component Main Air Compressor (including auto ops)

A

• Maintains receiver pressure by cycling on and off to maintain 560-600 psig.

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7
Q

DESCRIBE the operation of the DG starting and shutdown air system component Air Start Solenoids

A

• Provide an actuating control air signal to the Main Air Start valves and the Rack Boost 3-way valves

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8
Q

DESCRIBE the operation of the DG starting and shutdown air system component Barring Device Interlock

A

• Physically prevents pilot control air from the Air Start Solenoids from reaching the Main Air Start valves

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9
Q

DESCRIBE the operation of the DG starting and shutdown air system component Main Air Start Valves

A

• When provided with actuating air from the Air Start Solenoids, these valves provide starting air to the Air Start Distributors

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10
Q

DESCRIBE the operation of the DG starting and shutdown air system component Rack Boost 3-Way Valves

A

• Ports control air to the starting side of the fuel rack boost cylinder, provided all required conditions are met

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11
Q

DESCRIBE the operation of the DG starting and shutdown air system component Air/Oil Foggers

A

• Prevents degradation of the Air Start Distributor by supplying a thin mist of lubrication when starting the diesel

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12
Q

DESCRIBE the operation of the DG starting and shutdown air system component Air Start Distributors

A

• The admission of starting air to a particular cylinder is controlled by an air start distributor for each bank and is driven by the engine camshaft

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13
Q

DESCRIBE the operation of the DG starting and shutdown air system component Air Start Check Valves

A

• The air start distributors, driven by the engine camshafts, send pilot air signals to the air start check valves in each cylinder head

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14
Q

DESCRIBE the operation of the DG starting and shutdown air system component Stopping Air Accumulator

A

• Ensures that an adequate volume of air is maintained to actuate the rack boost servo piston in the event that both air receivers are inoperable

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15
Q

DESCRIBE the operation of the DG starting and shutdown air system component Shutdown Solenoid

A

• The Shutdown Solenoid allows control air to be ported to the shutdown side of the shutdown/rack boost piston, forcing it and the connected engine fuel rack to the shutdown position

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16
Q

DESCRIBE the operation of the DG starting and shutdown air system component Rack Boost Piston

A

• Actuates to move fuel racks to required position to maintain desired engine speed, or to drive the fuel racks to the shutdown position when engine shutdown is called for.

17
Q

STATE the design basis for the volume of the starting air receivers

A

Combined can start the diesel 5 times or twice for a lone receiver

18
Q

DESCRIBE the purpose and basic operation of the DG engine turbocharger

A

• Increase density of air for combustion make engine more efficient

19
Q

DESCRIBE the FO flowpath from the oil truck connection to the DG cylinder

A
  • Truck
  • FOST
  • Duplex strainer
  • FO XFER Pumps
  • FO Day Tank
  • Duplex strainer
  • Fuel Pumps
  • Filters
  • Injector Pumps
  • Injectors
  • Casing
20
Q

STATE the design basis for the volume of the FO storage tank and FO day tank

A 
•	Fuel oil storage tank
–	75,000 gallon tank
–	Tech spec minimum is 62,000 gallons
–	Good for 7 days operation 
•	Day Tank
–	1500 gallon capacity
–	3 hours full load
21
Q

STATE the power sources for the FO transfer pumps and each of the DG FO pumps.

A
  • Fuel Oil Pumps Power supply: 1A is MCC-511 and 1B is MCC-611.
  • Fuel Oil Transfer Pumps Power supply: 1A is MCC-521 and 1B is MCC-621
22
Q

DESCRIBE the operation and purpose of the DG lube oil (LO) system

A

The Diesel engine lube oil system supplies a continuous flow of oil to all engine surfaces
requiring lubrication, and to the piston crowns for cooling

23
Q

DESCRIBE the operation and purpose of the Engine Driven LO Pump

A
  • The Engine Driven LO pump is a positive displacement, rotary screw type pump mounted below the engine governor drive.
  • Normal source of oil pressure for the engine
24
Q

DESCRIBE the operation and purpose of the Motor Driven LO Pump
(including auto ops)

A

• The Aux LO pump has the same capacity and suction point as engine pump and acts as a backup.The motor driven pump will automatically start if the outlet
pressure from the duplex fuel filter drops to the low pressure alarm setpoint (15 psig)

25
Q

DESCRIBE the operation and purpose of the Rocker Arm LO Pump

A

• provides oil for lubrication of the rocker arm assemblies in the cylinder heads

26
Q

DESCRIBE the operation and purpose of the LO Heat Exchanger

A

• Maintains oil at 125 - 142°F

27
Q

DESCRIBE the operation and purpose of the LO Temperature Control Valve temperature control scheme

A

• Controls flow of oil through the LO HX to maintain oil temperature to the main engine header between 125°F and 142°F

28
Q

DESCRIBE the operation and purpose of the LO Keep Warm Pump (Prelube & Filtering Pump) & its purpose

A
  • Draws from the engine LO sump through a pump suction strainer.
  • Discharges through the lube oil heater, a 5 micron lube oil filter, then through the LO strainer to the main LO header
29
Q

DESCRIBE the operation and purpose of the LO Keep Warm Heater (including auto ops) & its purpose

A
  • Lube oil temperature is maintained between 130°F - 135°F when the engine is shutdown by thermostatic control of the electric immersion heating elements in the LO heater.
  • During an LOP start of the engine, the heating elements in the LO heater are de-energized by EPS
30
Q

NAME the support components which maintain the DG temperature when it is in standby, and DISCUSS why this is necessary

A

• On LOP/SI 2 minutes up to full load with no warm up. To reduce wear, Oil Keep Warm system maintains oil between 130F and 135F when engine shutdown
Consists of:
Pump suction strainer
Motor Driven Pre-lube and Filter pump
Lube Oil Heater
Lube oil filter - 5 micron
Strainer to header (same strainer previously discussed).

31
Q

DESCRIBE the following component cooled by the DG component cooling system: Engine Driven Jacket Coolant Pump

A
  • The Jacket Cooling pump is driven from one end of a shaft geared to the engine accessory drive.
  • The Air Coolant pump is driven by the other end of this shaft.
  • The discharge pressure of each centrifugal pump is approximately 70 psig
32
Q

DESCRIBE the following component cooled by the DG component cooling system: Jacket Coolant Keep Warm Pump (Standby Circulating Pump) & its purpose

A

• Electric motor driven centrifugal pump that runs continuously whenever the engine is shutdown (<375 rpm) to circulate jacket coolant through an electric heater.

33
Q

DESCRIBE the following component cooled by the DG component cooling system: Jacket Cooling Keep Warm Heater (including auto ops) & its purpose

A

• The electric heater is under thermostat control to maintain jacket water temperature between 145 F and 150 F. A temperature switch located at the coolant outlet from the engine will provide alarm indication if jacket water return temperature drops below 92F.

34
Q

DESCRIBE the following component cooled by the DG component cooling system: Engine Driven Air Coolant Pump

A
  • The Air Coolant pump is driven from one end of a shaft geared to the engine accessory drive.
  • The Jacket Cooling pump is driven by the other end of this shaft.
  • The discharge pressure of each centrifugal pump is approximately 70 psig.
35
Q

DESCRIBE the operation of each of the DG local control switches

A
  • Engine Control Station Selector Switch
  • Engine Normal Start/Stop Switch
  • Emergency Start Pushbutton
  • Emergency Stop Pushbuttons
36
Q

LIST the control switch positions required for a normal start

A

• remote

37
Q

DESCRIBE the types of operating procedures available for DG operation

A
  • Safety procedure
  • Tech spec procedure
  • Emergency Contingency Action

systems test 1 (11 decks)

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