OS- Lube Oil Purification, Storage, and Transfer

Question 1

What is the purpose of the OS system?

Answer 1

Remove contaminants from the Main Turbine Lube Oil and Feedwater Pump Turbine Lube oil to maintain the required lube oil quality

Provides lube oil storage for makeup and storage during outages

Transfers/recirculates lube oil from the storage tanks to the Main Turbine Lube Oil Reservoir and Feedwater Pump Turbine Lube Oil Reservoirs and between the reservoirs and the lube oil centrifuge or conditioner

Question 2

What is the capacity of the OS Lube Oil storage tanks? Location? What surrounds the tanks to contain an oil leak?

Answer 2

20,000 gallons

North yard

concrete berm

Question 3

What does Domestic Water system provide for OS?

Answer 3

Seal water to the OS system Feedwater Pump Turbine Lube Oil Centrifuge through a priming funnel

Question 4

What powers the OS system centrifuge, conditioner and LO Transfer Pump?

Answer 4

NH

Question 5

What does IA do for the OS system?

Answer 5

Provides air to the OSHA cover interlock control panel pressure instruments

Question 6

Both storage tanks are maintained in a “clean” condition. Which OS storage tank can I send “dirty” oil to if necessary?

Answer 6

‘B’ Lube Oil Storage Tank

Question 7

How are the OS Storage Tanks sized?

Answer 7

To hold the entire contents of both lube oil subsystems plus a contingency for oil in the process piping

Question 8

Where is the OS Lube Oil Transfer Pump located?

Answer 8

Next to the Lube Oil storage tanks in the north yard

Question 9

What type of pump is the OS Lube Oil Transfer Pump? What is upstream of the pump? What powers it?

Answer 9

Rotary gear

suction strainer

NH

Question 10

How is the OS Lube Oil Transfer pump operated? What is its purpose?

Answer 10

Manually from a local hand switch

to move oil to/from the storage tanks to the reservoirs or out of the system to a waste truck for removal

Question 11

What is the purpose of the Main Turbine Lube Oil Conditioner?

Answer 11

Removes water and particulates form the Main Turbine Lube Oil system by filtering action

Question 12

At what rate can main turbine lube oil conditioner purify the Lube Oil?

Answer 12

30 gal/min or about 20% per hour of Main Turbine Lube Oil normal operating capacity (11,000 gallons)

Question 13

Concerning the Main Lube Oil conditioner, which filter has a sight glass?

Answer 13

Filter #2 (where you can see the oil/water interface)

Question 14

At what rate is the FWPT Centrifuge capable of purifying oil?

Answer 14

5 gpm which is equivalent to approximately 15% per hour of the combined operating capacity of the two lube oil reservoirs (about 2000 gallons)

Question 15

What would cause the MFPT lube oil centrifuge package alarm bell to sound?

Answer 15

If any of the following occur:

Bowl loses its seal, (this causes a large flow of liquid to occur through the heavy phase outlet)

Low flow from heater

High vibration is sensed

Low air pressure

Question 16

When would the break-over switch in the MFPT lube oil centrifuge activate an alarm and shut off the feed valve?

Answer 16

If one of the following occurs:

The bowl loses its water seal, (which causes a large flow of oil through the heavy phase outlet)

Sudden large flow of water flows through the heavy phase outlet caused by a possible cooler tube leak

Question 17

What is the purpose of the OSHA interlock on the Main feed pump turbine lube oil centrifuge?

Answer 17

Automatically stops the centrifuge and alarms if the cover to the centrifuge is opened or if the cover clamps are loosened during centrifuge operation

The interlock also prevents starting the centrifuge if the cover is open

Question 18

In general, how does the Main Turbine Lube Oil conditioner clean the Lube Oil reservoir?

Answer 18

Uses a series of filters and a coalescer/separator

Question 19

How do we discard oil from the OS system?

Answer 19

A waste oil tanker truck can hook up to the storage tank and the dirty oil be pumped to the truck for discarding

Question 20

What does the OW system receive from the OS system?

Answer 20

centrifuge waste water

the sludge is retained in a holding space within the centrifuge

Question 21

When any of the lube oil reservoirs must be emptied, the oil can be pumped to which OS storage tank for storage and purification?

Answer 21

B tank

Question 22

What features are provided with the OS storage tanks?

Answer 22

new oil fill connection, pump suction connection, level indicator, flush connection and a vent with flame arrestor

Question 23

How is the plant affected by a loss of the OS conditioner or a centrifuge?

Answer 23

no immediate impact

eventually the lube oil would degrade in quality and negatively impact equipment

(the conditioner and/or centrifuge can be out of service for short periods of time)

Question 24

What are the major components of the OS system?

Answer 24

two storage tanks

MFWPT lube oil centrifuge

MTLO conditioner(turbo toc)

lube oil transfer pump

MFWPT lube oil reservoir

MTLO reservoir

piping and valves

Question 25

The main feedwater pump turbine lube oil reservoir and the main turbine lube oil reservoir may be connected to what for sending oil back and forth?

Answer 25

LO storage tanks and/or either the MFWPT lube oil centrifuge or the MTLO conditioner

(both can connect to everything)

Question 26

In the OS system what is in-service during normal operation? During shutdown conditions?

Answer 26

centrifuges and conditioner

transfer pump and storage tanks

Question 27

What does the MFWPT lube oil centrifuge consist of? What is the flow path of the skid?

Answer 27

centrifuge, feed pump, discharge pump, heater, filter, instrumentation and control package

feed pump, heater, centrifuge, discharge pump, filter, two lube oil reservoirs

Question 28

Where can the OS lube oil centrifuge be aligned for recirculation?

Answer 28

MTLO reservoir, both FWPT lube oil reservoirs, LO storage tanks

can also purify oil during transfer of oil between reservoirs and storage tanks

Question 29

Describe the flowpath through the centrifuge.

Answer 29

dirty oil enters the top of the revolving bowl through a tube, passes down the inside of a shaft into the stack of discs, up through the disc distribution holes to the center of the top disc

As the oil travels through, the dirt, sludge and water moves outward.

the water forms a seal around the bottom of the top disc to force the oil to the center

Question 30

What trips the two speed, positive displacement pump in the MTLO conditioner package?

Answer 30

high vacuum switch (from the inlet strainer)

low flow switch

Question 31

What are the main components of the MTLO conditioner package?

Answer 31

Inlet Strainer

High Vacuum Switch (trips the pump if the suction strainer is clogged)

Two speed positive displacement pump

Flow Indicator/Switch (trips the pump on low flow)

Electric Heater

Prefilter (Filter #1)

Coalescer/Separator (Filter #2)

Polishing filter (Filter #3)

Automatic Float Control Valve

Automatic Water Drain Valve

Auto Air Release

Instrumentation Panel

Control and Indication Panel

Question 32

What amber lights are associated with the MTLO conditioner?

Answer 32

low flow

high vacuum

filter #1- prefilter

filter #2- coalesce/separator

filter #3- polishing filter

Question 33

How is the flow rate of the MTLO conditioner pump changed?

Answer 33

shut the pump off, flip the flow rate switch

Question 34

Regarding the MTLO conditioner, where is the removed water directed?

Answer 34

to the bottom of the #2 filter housing with an automatic float.

with enough water collected, the float will open the automatic water drain valve

Question 35

What is the purpose of the varnish removal system within the OS system?

Answer 35

10 gpm system removes the soft contaminants in solution and in suspension from the oil breaking down.