TLO

Question 1

Explain how bearing oil header pressure is maintained

Answer 1

The booster pump turbine lowers pressure to 100#

a pressure regulating relief valve further lowers pressure to 25# at front standard

Question 2

State turbine trip due to Main Oil Pump (MOP)

Answer 2

• Discharge pressure <100# on 2/3 switches if >75% speed

- Bearing oil header pressure <12# on 2/3

Question 3

State auto start of Motor Suction Pump (MSP)

Answer 3

If Main Oil Pump (MOP) suction pressure <10#

this pump is back up to the booster

Question 4

State auto start of Turning Gear Oil pump (TGOP)

Answer 4

• Main oil pressure <190#

- Bearing oil pressure <15#

Question 5

State auto start of Emergency Bearing Oil pump (EBOP)

Answer 5

• MOP discharge <180# 1/2 AND
• TGOP discharge <17.5# 1/2
  OR
• TGOP power is lost

Question 6

State auto start of Bearing Lift pumps

Answer 6

• EPS @ LR1 with lift pump suction pressure >6#
  OR
• Armed and TGOP >/= 10#

Question 7

State purpose and precaution of the Vapor Extractor

Answer 7

• Removes H2 gases, moisture and air from the reservoir when online
• When off line it needs to be shut down to prevent dirt and air from being sucked through the turbine bearings