Main Turbine Lube Oil (LO)

Question 1

What is the purpose of the LO system?

Answer 1

Provides lubricating oil to the Main Turbine and Generator bearings

Provides lubricating oil to the Bearing Lift Oil Pumps

Supplies oil to the Generator Seal Oil System

Question 2

What is the heat sink for the Main Turbine LO coolers?

Answer 2

TC

Question 3

What system powers the Emergency Lube Oil Pump?

Answer 3

NK (NKN-M46)

Question 4

The Main Turbine LO system is a backup oil supply for what system?

Answer 4

Generator Seal Oil system when both the Main and Emergency Seal Oil pumps fail

Question 5

What system purifies the Main Turbine LO System?

Answer 5

OS

Question 6

What is the capacity of the LO Reservoir and what is the normal level?

Answer 6

Capacity of 11200 gallons

Normal level of 8550 gallons

Question 7

Where is the LO reservoir located?

Answer 7

140’ Turbine Building in the Lube Oil Room

Question 8

What provides the motive force for the Main Shaft Oil Pump and where is it located?

Answer 8

Gear driven from the HP turbine shaft and is located in the HP turbine housing on the 176’ Turbine Building

Question 9

What is the Main Shaft Oil Pump rated for?

Answer 9

1500 gpm and 235 psig at 3600 RPM

Question 10

What is the motive force used to drive the Booster Pump?

Answer 10

Oil Driven Turbine, where a portion of the Main Shaft Oil Pump discharge is routed to the inlet of the turbine

Question 11

What pump is used if the Booster Pump output is insufficient to drive the oil-driven turbine?

Answer 11

Motor Suction Pump will be used to supply the Main Shaft Oil Pump suction

Question 12

What is the Booster Oil Pump rated for?

Answer 12

1500 gpm at a discharge pressure of 62 psig

Question 13

What is the purpose of the Motor Suction Pump?

Answer 13

To provide the Main Shaft Driven Oil pump with a source of oil to its suction when the turbine speed is less than 90%

The Booster Pump will have sufficient capacity when turbine speed it greater than 90%

Question 14

What is the purpose of the Turning Gear Oil Pump?

Answer 14

To provide bearing oil to the turbines bearings while the turbine is on the turning gear or when it is coming up to speed

Question 15

What signals would cause an auto start of the Turning Gear Oil Pump?

Answer 15

Main shaft oil discharge pressure low @ 190 psig, or

Bearing Oil Pressure Low @ 15 psig

Question 16

How often is the Auto start tested and where are the pushbuttons for the tests?

Answer 16

Performed weekly

Four pushbuttons, two in the control room and two at the Main Lube Oil reservoir

Question 17

What is the purpose of the Emergency Bearing Oil Pump?

Answer 17

To supply oil for shutting down the turbine should there be a simultaneous low discharge pressure on the Main Shaft Oil Pump and the Turning Gear Oil Pump

Question 18

What would auto start the Emergency Bearing Oil Pump?

Answer 18

A low voltage on NGN-L14 (Power supply to the Turning Gear Oil Pump)

Main shaft oil discharge pressure low @ 180 psig, AND Turning Gear Oil Pump Discharge Pressure low @ 15 psig

Question 19

How often is the EBOP auto start tested and where are the pushbuttons?

Answer 19

Performed weekly
One in the Control Room and one at the

Lube Oil Reservoir

Question 20

How is the “double handwheel” cooler inlet valve operated?

Answer 20

Lower Handwheel is used to lock the valve stem into position and the Upper Handwheel is used to select which cooler is in service

Question 21

How can I tell the cooler is full?

Answer 21

By opening the bypass valve and observing oil flow from a constant vent on the cooler that can be seen by lifting a hatch on the reservoir

Question 22

What is the purpose of the Vapor Extractor?

Answer 22

Pulls air, oil vapor, hydrogen, and moisture from the Main Turbine Lube Oil Reservoir through the Lube Oil Mist Eliminator adjacent to the Vapor Extractor

Question 23

How do we prevent oil vapor from leaking out past the bearing oil deflector?

Answer 23

Pressure on the pedestal side of the oil deflector is less than the outside

Question 24

What is the Mist Eliminator comprised of?

Answer 24

Five fiberglass filters mounted in parallel inside a cylindrical cylinder supported by a frame

Question 25

Where is the Vapor Extractor located?

Answer 25

176’ Outside the turbine building

Question 26

Where do I operate the Vapor Extractor?

Answer 26

Handswitch located by the Vapor Extractor

Question 27

What is the purpose of the Bearing Oil Lift Pumps?

Answer 27

To reduce the torque requirements of the Turning Gear Motor

Question 28

Where are the Bearing Oil Lift Pumps located?

Answer 28

176’ Turbine Building

Question 29

What would auto start a Bearing Lift Oil Pump?

Answer 29

Turning Gear Pump discharge pressure high signal is received

Question 30

What would stop the Bearing Lift Oil pump?

Answer 30

Lift Pump suction pressure low or electrical protection signal

Question 31

What is the interlock associated with bearings 7 and 10 and the Lift pumps? Purpose?

Answer 31

When the following conditions are met, the lift pumps for these bearings will stop:
- Bearing oil lift pump hand switch in the
Control Room is in Auto
- Turning Gear Motor is running
- Turbine Rotor Speed is less than 2 rpm

Prevents the turbine gear from disengaging during turbine shaft pulses

Question 32

What portions of the header supply use pipe-within-pipe arrangement?

Answer 32

Piping in vicinity of hot turbine parts

Question 33

What Main Shaft Oil Pump discharge pressure would trip the Main Turbine?

Answer 33

100 psig

Question 34

What bearing header pressure would trip the Main Turbine?

Answer 34

Below 12 psig