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CO, SO, CE, Gen H2, OW, RD, CM > Generator Seal Oil > Flashcards

Generator Seal Oil Flashcards

0
Q

What is the purpose of MT LO in the generator seal oil system?

A

Cools and conditions the seal oil

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1
Q

What is the purpose of the generator seal oil system?

A

Controls leakage of hydrogen gas.

Maintains hydrogen purity by preventing atmospheric contamination

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2
Q

What is the power source for the gen seal oil pumps?

A

NH

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3
Q

What is the power source for the emergency seal oil pump?

A

NK

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4
Q

How does the main generator interface with the gen SO system?

A

Receives and circulates seal oil for rotor shaft sealing

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5
Q

What is the purpose of the seal oil vacuum tank?

A

Lube oil enters through spray nozzles and a float valve to remove gases from the oil.

Remaining gases are removed from the recirculating flow.

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6
Q

What helps to reduce foaming in the vacuum tank?

A

Recirculation of oil from the tank back through the spray nozzles.

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7
Q

What happens to the oil in the vacuum tank if normal LO supply is not available?

A

SO is automatically recirculated and returned to the vacuum tank via the seal drain.

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8
Q

Where is the vacuum tank located?

A

140’ turbine building. NE corner

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9
Q

What is the purpose of the SO vacuum pump?

A

Takes suction on the SO tank and recirculates it to remove entrained gasses.

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10
Q

What seals and lubricates the vacuum pump?

A

Oil is supplied from a separator tank mounted above the pump.

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11
Q

What is the power supple for the vacuum pump?

A

NH

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12
Q

What is the purpose of the main SO pump?

A

Takes suction from the vacuum tank and pumps oil to the shaft seals at approx. 83 psig

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13
Q

What happens to excess oil pumped by the main SO pump?

A

Returned to the tank through relief valve PSV-11

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14
Q

What is the power supply to the main SO pump

A

NH

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15
Q

Where is the main SO pump located?

A

The main seal oil skid on the 140’ of the turbine building.

16
Q

Where is the main SO pump controlled from?

A

Control room

17
Q

What is the purpose of the recirculating seal oil pump?

A

Suction from the vacuum tank.
Discharge to downward spray nozzles in the vacuum tank.
Separates gasses from oil.

18
Q

What is the power supply to the recirculating SO pump?

A

NH

19
Q

Where is the recirculating SO pump located and controlled from?

A

140’ turbine bldg

Control room

20
Q

What causes the emergency SO primo to auto start? Switch is in the auto position.

A

Failure of the main SO pump when low pressure signal is received at 110 psig at the main SO pump discharge.

21
Q

What happens to the vacuum tank when the emergency pump is in operation?

A

The vacuum tank becomes inoperative.

22
Q

Where is the emergency seal oil pump taking suction from?

A

Oil supply header

This allows the vacuum tank to fill with oil. (Causes LCV-25 to close so no oil enters the tank)

23
Q

What happens when the emergency seal oil switch is placed in the test position? Can be done locally or from the control room..

A

Testing the auto actuation of the emergency pump.

Opens valve HV-13 which simulates low discharge condition.

24
Q

What is the purpose of the seal oil filter?

A

Two in parallel, one in standby, three way valve to shift filters.
Paper filter to remove contaminants.

25
Q

What must be in operation before admitting hydrogen to the generator and until it is purged?

A

Generator seal oil.

26
Q

What happens if the main seal oil pump and the emergency seal oil pump is lost?

A

The main lube oil system will supply seal oil at a reduced pressure and hydrogen pressure will drop.

Generator load would need to be reduced.

27
Q

What happens if there is a loss of seal oil and a leak is detected?

A

Turbine trip and limits of ignition sources.

28
Q

What happens if the main lube oil supply to the seal oil system is lost?

A

It will become a closed loop system with drains from both detraining sections returning to the seal oil vacuum tank.

CO, SO, CE, Gen H2, OW, RD, CM (7 decks)

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