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M-43 Diesel Generator Flashcards

TRA00105

1
Q

What is the normal alignment of M-43 DG?

A

Auto-start of EDG of M-6 is normally in standby and available as backup. 670-M-43 is normally available for manual start to back up 674-M-6.

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2
Q

What is the alternate alignment of M-43 DG?

A

670-E-3 diesel bus is powered by manual start of 1500 kW DG 670-M-43 or auto-start of 674-M-6.

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3
Q

Is M-43 safety-related?

A

No

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4
Q

Describe design characteristics of 670-M-43.

A

8 cylinder, 360 RPM 2118 hp turbocharged engine.
1500 kW and 260A design rating
4160V @ 550 kW normal load

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5
Q

Describe the operation of the 670-M-43 Woodward governor.

A

Mechanical governor connected to fuel rack.
Load limit set to 3 for startup and 10 prior to paralleling.
Speed droop set to 40 prior to generator paralleling and 0 while the engine is running loaded.
With speed droop in 40, parallel ops
With speed drop in 0, isochronous mode
Compensates for electrical load changes by maintaining engine speed constant.

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6
Q

Describe the operation of the Crankcase Exhaust Blower for 670-M-43 DG.

A

Takes suction from crankcase, discharge to turbo inlet.
Blower control switch in AUTO: start when L.O. pressure reaches 25 psig, can be started in Manual, runs for 5 minutes after SD.
Bypass for crankcase is used to adjust vacuum, directs flow around the blower.
Vacuum oil separator allows removal of entrained oil.

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7
Q

What is the purpose of cylinder compression cocks on the M-43 DG?

A

Used to vent cylinders prior to starting engine.

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8
Q

What is the purpose of the Pneumatic Barring Device?

A

Turns engine over prior to starting.

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9
Q

What is the actuating force for the M-43 pneumatic barring device?

A

Instrument air.

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10
Q

What is the purpose of 670-M-71 M-43 Drain Tank?

A

Receive normal fuel oil leakage from:
1. Injector Pumps
2. Engine-driven fuel oil pump
3. Receives fuel oil which may be drained from the supply piping and intake manifold

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11
Q

What is the capacity of 670-M-71 M-43 Drain Tank?

A

670-M-71 has a 10 gallon capacity

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12
Q

What is the capacity of M-43 sump tank 670-M-89?

A

670-M-89 has a 650 gallons capacity

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13
Q

What is the purpose of the M-43 rollback relief valve?

A

On shut down, the engine coasts to a stop then typically rolls back to its final resting position. This small amount of rollback provides several revolutions on the lube oil pump in the reverse direction. Since there is a foot valve in the sump, this section of pipe would be pressurized without this relief present.

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14
Q

What is the normal purpose of the M-43 auxiliary lube oil pump M-49?

A

Establishes lube oil flow and pressure prior to diesel engine startup. Removes residual heat after shutdown.

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15
Q

What is the AOP use of M-43 auxiliary lube oil pump M-49?

A

If M-43 pressure is below alarm setpoint of 40 psig or supercharger oil pressure is below alarm setpoint of 22 psig, with M-43 still running, AOP-12.2 directs operator to start aux lube oil pump in HAND

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16
Q

What is the power supply for the M-43 auxiliary lube oil pump M-49?

A

M-49 aux lube oil pump is powered from diesel/commercial MCC 670-E-15.

17
Q

Describe M-43 DG lube oil temperature control.

A

L.O. TCV-12-2B (3-way) controlled by TIC-12-2B. Controls oil flow around or through the L.O. heat exchanger.
Temp switch TIS-12-1B monitors temp and actuates at 190F.

18
Q

What is the purpose of M-43 L.O. Recirc Pump M-53?

A

Constant filtering of lube oil through the recirculation filter.

19
Q

What is the power supply for M-43 L.O. Recirc Pump M-53?

A

M-53 is powered by 670-E-11.

20
Q

Describe the operation of M-43 LO Recirc Pump M-53.

A

Starts after diesel is started when oil temp reaches 150F. Must be restarted manually on loss and subsequent restoration of diesel power. Normally operates as long as the diesel is running.

21
Q

Give the two automatic engine shutdowns for M-43 DG.

A
  1. Low LO Pressure (35 psig)
  2. Overspeed (396-424 RPM)
22
Q

Give the three M-43 DG Manual Shutdowns.

A
  1. Load Limit knob on governor (Closes fuel rack when rotated to 0)
  2. Manual shutdown lever
  3. Emergency shutdown lever (panel TR-12-2)
23
Q

Draw the M-43 DG Jacket Water system.

24
Q

What are the cooling and makeup water sources for the M-43 DG?

A

UCW supplied to the tube side of jacket water HX
LDW is the makeup source and is added via the expansion tank

25
What are the full load conditions for the M-43 jacket water system?
500 GPM flow 170F out, 150F in
26
What loads on the M-43 DG are supplied by UCW?
Combustion air cooler Lube oil HX Jacket water HX
27
Describe backup cooling for M-43 DG.
On UCW failure: Check valve opens to supply SCS On loss of both UCW and SCS (or UCW below 50 psig): PCV-4-7 opens at 50 psig UCW and admits firewater from reactor lower EFIS line
28
Describe operation of the auxiliary jacket water pump on M-43 DG.
Microswitch SS-12-2B starts aux jacket water pump (closes when fuel rack closes) Energizes a timer which starts the aux jacket pump if in auto Runs for 5 minutes then stops the pump
29
Describe the operation of the aux lube oil pump on M-43 DG.
Microswitch SS-12-3B starts aux lube oil pump (in auto) Energizes timer Runs for 5 minutes then stops the pump
30
Give the auto starts for Aux Jacket Water Pump M-61 for the M-43 DG.
1. Starts on loss and subsequent restoration of diesel-comm power 2. Starts on 195F TIS-12-15B temp switch
31
What is the power supply for the M-43 aux jacket water pump M-61?
Diesel/Commercial MCC 670-E-15
32
What is the capacity of the M-43 DG jacket water expansion tank M-62?
150 gallon capacity
33
What is the makeup source for jacket water on M-43?
LDW
34
How many starts does the starting air system for M-43 DG supply from 250 psig?
5-8 starts.
35
What is the backup method for air start of M-43 DG?
Plant air at 120 psig can technically start the M-43 DG.
36
Describe the air start system for the M-43 DG.
Two 14 cfm compressors and two receivers in the second basement, HDW room.
37
How does a loss of high pressure air impact the M-43 DG while running?
M-43 would continue to run but would lose its low lube oil pressure automatic shutdown.
38
What is the purpose of 670-E-77 Emergency Electrical DG Startup Panel (ESP)?
Located in diesel pit west end and south of M-43. In case of confinement evac, E-77 ESP provides a remote means of closing the M-43 gen and field breakers on E-3. Pistol grip switches inside E-77 ESP open or close the UCW pump breakers in E-3.
39
How do you start the M-43 DG if power is not available to the standby lube oil pump?
AMOT reset handle must be held in the reset position to allow start (can be released after lube oil pressure >40 psig)

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