Main Turbine Lube Oil (LO) Flashcards
What is the purpose of the LO system?
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
What is the heat sink for the Main Turbine LO coolers?
TC
What system powers the Emergency Lube Oil Pump?
NK (NKN-M46)
The Main Turbine LO system is a backup oil supply for what system?
Generator Seal Oil system when both the Main and Emergency Seal Oil pumps fail
What system purifies the Main Turbine LO System?
OS
What is the capacity of the LO Reservoir and what is the normal level?
Capacity of 11200 gallons
Normal level of 8550 gallons
Where is the LO reservoir located?
140’ Turbine Building in the Lube Oil Room
What provides the motive force for the Main Shaft Oil Pump and where is it located?
Gear driven from the HP turbine shaft and is located in the HP turbine housing on the 176’ Turbine Building
What is the Main Shaft Oil Pump rated for?
1500 gpm and 235 psig at 3600 RPM
What is the motive force used to drive the Booster Pump?
Oil Driven Turbine, where a portion of the Main Shaft Oil Pump discharge is routed to the inlet of the turbine
What pump is used if the Booster Pump output is insufficient to drive the oil-driven turbine?
Motor Suction Pump will be used to supply the Main Shaft Oil Pump suction
What is the Booster Oil Pump rated for?
1500 gpm at a discharge pressure of 62 psig
What is the purpose of the Motor Suction Pump?
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%
What is the purpose of the Turning Gear Oil Pump?
To provide bearing oil to the turbines bearings while the turbine is on the turning gear or when it is coming up to speed
What signals would cause an auto start of the Turning Gear Oil Pump?
Main shaft oil discharge pressure low @ 190 psig, or
Bearing Oil Pressure Low @ 15 psig
How often is the Auto start tested and where are the pushbuttons for the tests?
Performed weekly
Four pushbuttons, two in the control room and two at the Main Lube Oil reservoir
What is the purpose of the Emergency Bearing Oil Pump?
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
What would auto start the Emergency Bearing Oil Pump?
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
How often is the EBOP auto start tested and where are the pushbuttons?
Performed weekly
One in the Control Room and one at the
Lube Oil Reservoir
How is the “double handwheel” cooler inlet valve operated?
Lower Handwheel is used to lock the valve stem into position and the Upper Handwheel is used to select which cooler is in service
How can I tell the cooler is full?
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
What is the purpose of the Vapor Extractor?
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
How do we prevent oil vapor from leaking out past the bearing oil deflector?
Pressure on the pedestal side of the oil deflector is less than the outside
What is the Mist Eliminator comprised of?
Five fiberglass filters mounted in parallel inside a cylindrical cylinder supported by a frame
Where is the Vapor Extractor located?
176’ Outside the turbine building
Where do I operate the Vapor Extractor?
Handswitch located by the Vapor Extractor
What is the purpose of the Bearing Oil Lift Pumps?
To reduce the torque requirements of the Turning Gear Motor
Where are the Bearing Oil Lift Pumps located?
176’ Turbine Building
What would auto start a Bearing Lift Oil Pump?
Turning Gear Pump discharge pressure high signal is received
What would stop the Bearing Lift Oil pump?
Lift Pump suction pressure low or electrical protection signal
What is the interlock associated with bearings 7 and 10 and the Lift pumps? Purpose?
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
What portions of the header supply use pipe-within-pipe arrangement?
Piping in vicinity of hot turbine parts
What Main Shaft Oil Pump discharge pressure would trip the Main Turbine?
100 psig
What bearing header pressure would trip the Main Turbine?
Below 12 psig
