OS- Lube Oil Purification, Storage, and Transfer COPY Flashcards

1
Q

What is the purpose of the OS system?

A

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

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2
Q

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

A

20,000 gallons

North yard

concrete berm

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3
Q

What does Domestic Water system provide for OS?

A

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

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4
Q

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

A

NH

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5
Q

What does IA do for the OS system?

A

Provides air to the OSHA cover interlock control panel pressure instruments

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6
Q

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

A

‘B’ Lube Oil Storage Tank

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7
Q

How are the OS Storage Tanks sized?

A

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

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8
Q

Where is the OS Lube Oil Transfer Pump located?

A

Next to the Lube Oil storage tanks in the north yard

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9
Q

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

A

Rotary gear

suction strainer

NH

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10
Q

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

A

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

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11
Q

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

A

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

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12
Q

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

A

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

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13
Q

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

A

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

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14
Q

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

A

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

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15
Q

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

A

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

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16
Q

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

A

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

17
Q

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

A

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

18
Q

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

A

Uses a series of filters and a coalescer/separator

19
Q

How do we discard oil from the OS system?

A

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

20
Q

What does the OW system receive from the OS system?

A

centrifuge waste water

the sludge is retained in a holding space within the centrifuge

21
Q

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

A

B tank

22
Q

What features are provided with the OS storage tanks?

A

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

23
Q

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

A

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)

24
Q

What are the major components of the OS system?

A

two storage tanks

MFWPT lube oil centrifuge

MTLO conditioner(turbo toc)

lube oil transfer pump

MFWPT lube oil reservoir

MTLO reservoir

piping and valves

25
Q

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?

A

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

(both can connect to everything)

26
Q

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

A

centrifuges and conditioner

transfer pump and storage tanks

27
Q

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

A

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

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

28
Q

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

A

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

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

29
Q

Describe the flowpath through the centrifuge.

A

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

30
Q

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

A

high vacuum switch (from the inlet strainer)

low flow switch

31
Q

What are the main components of the MTLO conditioner package?

A

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

32
Q

What amber lights are associated with the MTLO conditioner?

A

low flow

high vacuum

filter #1- prefilter

filter #2- coalesce/separator

filter #3- polishing filter

33
Q

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

A

shut the pump off, flip the flow rate switch

34
Q

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

A

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

35
Q

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

A

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