MTLO

Question 1

Turbine Lube Oil
Purpose

Answer 1

Provides clean and tempered oil for bearing lubrication and cooling during normal and
emergency conditions for the Main Turbine, Generator, and Exciter

Question 2

Unless permission has been obtained from operations director what should you NOT do with coolers?

Answer 2

Do not swap coolers at POWER

Question 3

Main Turbine Oil conditioner
(LO-L-1 or bowser)

Answer 3

Purify main turbine lube oil continuously by removing water and
particulate materials. Design standard requires 10% of oil system purified per
hour (10 hours to purify entire LO volume), which the Bowser exceeds.

Question 4

Main bowser exhauster
(LO-E-1)
Location, Power supply

Answer 4

Location: 305’ TB on top of bowser
Power supply: 1C TP MCC

Question 5

LO-T-3 Exhauster (LO-E-3)
Location, Power supply

Answer 5

Location: 305’ TB west side of main bowser
Power supply: 1C TP MCC

Question 6

Motor Drive Suction Pump (LO-P-4)
Location, power supply

Answer 6

Location: 322’ TB inside oil reservoir
Power supply: 1A TP MCC

Question 7

motor Drive Suction Pump (LO-P-4)
Auto start/purpose

Answer 7

Auto start: when LO-P-10 suction pressure ≤10#
Purpose: Provides suction pressure of 30 psig for LO-P-10 during start up when main turbine speed <95% rated speed

Question 8

Turning Gear Oil Pump
(LO-P-5)
Location, power supply

Answer 8

Location: inside the oil reservoir
Power supply: 1A ES MCC

Question 9

Turning Gear Oil Pump
(LO-P-5)
Auto Start/Trip

Answer 9

Auto Start:** Auto starts ≤15# @ Bearings or <190 # @ LO-P-10 discharge**
Trips: 27/86 Lockout of AUTO Start on ES + UV (can be manually started)

Question 10

Emergency Bearing Oil Pump
(LO-P-6)
Location/power supply

Answer 10

Location: 322’ TB inside oil reservoir
Power supply: 1C DC

Question 11

Emergency Bearing Oil Pump
(LO-P-6)
Auto Start

Answer 11

Auto starts on <170# @ LO-P-10 discharge if LO-P-5 doesn’t have
discharge pressure OR LO-P-5 loses power (breaker OPENS, bus de-energized,
thermal overload).** LO-P-6 will continue to run until manually shut down.**

Question 12

Main Shaft Driven Oil Pump (LO-P-10 or MSOP)
Purpose

Answer 12

Driven at 3600 rpm from the main shaft to supply oil to discharge
header at 200-225 psig to provide bearing lube oil and drive booster pump LO-P-11 when Main Turbine >95% speed. LO-P-10 requires 15-20# suction pressure

Question 13

Turbine Driven Booster Pump (LO-P-11)
purpose

Answer 13

An oil turbine driven pump that supplies oil at a pressure of
approximately 35# to suction of LO-P-10 when turbine shaft speed > 95%

Question 14

Turbine Driven Booster Pump (LO-P-11)
Inlet baffler valve purpose

Answer 14

Throttles inlet to LO-P-11 to regulates booster pump
discharge at 35# @ rated speed

Question 15

Turbine Driven Booster Pump (LO-P-11)
bypass baffler valve purpose

Answer 15

Throttles excess flow to LO-P-11 turbine into a bypass line,
supplying bearing header oil @ 35 psig at bearings and 50# at pump discharge.

Question 16

Lube oil transfer pump (LO-P-1)
Location, power supply

Answer 16

Location: 305’ TB between east stairwell and Condensate chem add tanks
Power supply: 1A TP MCC

Question 17

Main Turbine Oil Filter Pump (LO-P-2)
Location, power supply

Answer 17

Location: 305’ TB West side of main bowser
Power supply: 1C TP MCC

Question 18

High Pressure Lift Oil Pump (LO-P-7A/B/C/D/E/F/G/H/I/J)
Location/power supply

Answer 18

Location: 355’ TB West of Main Turbine (A – F in NW Corner, G-J in SW Corner)
Power Supply: 7A through 7F →1A ES MCC, 7G through 7J → 1B ES MCC

Question 19

High Pressure Lift Oil Pump (LO-P-7A/B/C/D/E/F/G/H/I/J)
Interlocks
Start permissive
trips

Answer 19

Interlocks: ALL pumps must be running OR bypassed to place TB on turning gear
Start Permissive: >5# Suction Pressure
Trips: Pump trips on <5# Suction Pressure, 27/86 Lockout on ES and UV

Question 20

Explain what happens based on Bearing header pressure
Normal to low (3 things)

Answer 20

25-35# = normal bearing header pressure
≤15# Bearing Header LO-P-10 Discharge = LO-P-5 auto starts
≤12# bearing/24# at sensor location = the turbine will trip

Question 21

Explain what happens with MSOP suction/discharge pressures from normal to low (3 things)

Answer 21

200-225# = normal bearing/LO-P-10 discharge pressure
<190# LO-P-10 Discharge= LO-P-5 Auto starts
<170# LO-P-10 Discharge = LO-P-6 Auto starts if LO-P-5 is not running

Question 22

L&P
When do you change filter bag on bowser to avoid filter bag overflow?

Answer 22

When oil head above filter element has risen to 6 inches as indicated by filter compartment gauge glass

Question 23

What lube oil cooler outlet temperature do you maintain and with what valve when turbine is at rated speed?

Answer 23

110-120F via SC-V-5A/B

Question 24

What lube oil cooler outlet temperature do you maintain and with what valve when turbine is on turning gear?

Answer 24

80-90F via SC-V-5A/B

Question 25

Lube Oil Fire Hazard Reduction (3 things)

Answer 25

* Pressurized piping near hot components have guard pipe (pipe in a pipe), which returns any leakage back to reservoir * Tanks have covers that rapidly relieve oil vapor/H2 explosion * Minimize leakage by only placing threaded connections inside guard pipes and minimal use of pipe joints

Question 26

Lube Oil Coolers (LO-C-2A/B) Location, power supply

Answer 26

Location: 322 TB inside Main Lube Oil Reservoir LO-T-3 Power supply: SCCW cools oil before entering bearing header, and only one cooler in service at a time. DO NOT SWAP COOLERS AT POWER unless permission has been obtained from Operations Director

Question 27

SC-V-5A/B throttled manually to maintain what?

Answer 27

To maintain normal operating temperature between 110-120F and 80-90F during startup and shut down

Question 28

Oil too cold causes what?

Answer 28

Oil whip, vibration and possible shaft/bearing damage

Question 29

Oil too hot causes what?

Answer 29

Viscosity Breakdown (less heat removal and lubrication, may lead to shaft/bearing damage

Question 30

Less than what bearing header pressure will turbine trip, and how many logic signals does it take?

Answer 30

<12#, 2 out of 3 logic at LO-PS-1700 A/B/C

Question 31

What happens on a loss of 1D 4kv?

Answer 31

LO-P-6 starts and does NOT supply TB bearing oil. LO-P-6 cannot overcome LO-P-11 discharge pressure