Control Oil (CO)

Question 1

What does the Hydraulic Fluid Reservoir provide ?

Answer 1

Stores & supplies control oil for system

Question 2

How is temperature maintained in the Hydraulic Reservoir ?

Answer 2

Two electric heater fan units for Hydraulic Fluid Temperature Control

Question 3

When are the Hydraulic Heater Fans turned on ?

Answer 3

Operated automatically by temperature controller to maintain >85F

Question 4

What do the reservoirs Temperature Indicating Controllers do ? What is the temperature of the Hydraulic fluid returning to reservoir ?

Answer 4

-Control position of Hydraulic Fluid Cooler Inlet Valves
-Hydraulic Fluid returning is approx. 115F

Question 5

Which pump is used to drain & fill reservoir ? Where is the Hydraulic Oil pumped from to fill reservoir ?

Answer 5

-Hydraulic Fluid Filtering pump
-Pumped from 55 Gallon Hydraulic Barrels

Question 6

What is reservoir level normally maintained at ?

Answer 6

Maintained between -2” to +2”

Question 7

What must be done to the 55 gallon barrel before adding it to reservoir ?

Answer 7

Barrel must be heated by a strap-on wrap-around heaters

Question 8

When do the Reservoir Heater & Fans energize when in auto ?

Answer 8

-Heaters & fans energize when temperature drops below 85F

Question 9

When do the Heaters & fans denergize when switch is in auto ?

Answer 9

-Heater denergize when reservoir temperature reaches 85F
-Fans will run for 10 minutes to cool heaters once temperate reaches 85

Question 10

What happens when you take the Heater & Fan switch to the start position ?

Answer 10

Fans will start, but the heaters won’t start regardless of temperate

Question 11

What is the Reservoir Air Dryer used for ?

Answer 11

Removes moisture from air breathed by Hydraulic Fluid Reservoir during power operation

Question 12

How does Reservoir Air Dryer work?

Answer 12

It uses a Alumina desiccant to remove moisture from reservoir

Question 13

What does the Stealth Control Oil Reservoir Conditioner/Dryer do?

Answer 13

Injects .2 SCFM of air from instrument air into air dryer to blanket reservoir to exclude moisture & contaminants

Question 14

What indications do you have on the pre filter indications for the air dryer supplying air to blanket reservoir ?

Answer 14

Green-less than 15psid
Orange-greater or equal to 15psid
Red-greater or equal to 25psid

Question 15

What do the Hydraulic Fluid Pumps maintain Control Oil System pressure at ?

Answer 15

Maintains 1600psig for use of Stop Valves, Control Valves, & Combined Intermediate Valves

Question 16

Where are the Main Hydraulic powered from ?

Answer 16

Powered 480Load center (NG)

Question 17

How does the Main Hydraulic Pumps maintain constant system pressure ?

Answer 17

Pump varies its stroke to meet demand & constant pressure

Question 18

What does the Auxiliary pump do ?

Answer 18

Takes suction from Control Oil Reservoir to cool & lubricate main Hydraulic Fluid Pump

Question 19

Where is the Auxiliary Pump mounted to ?

Answer 19

Mounted into Main Pump housing & is driven by Main Hydraulic Pump Shaft

Question 20

What’re the three indication for the suction strainer for Main Hydrulic pump & Aux pump ?

Answer 20

-Filter clean
-Needs cleaning
- Bypassing

Question 21

What is the automatic bleed valve used for at the discharge of the Hydraulic pump ?

Answer 21

-Allows rapid full pressure starts after a strainer has been cleaned
-Bleed Valve discharges to reservoir

Question 22

Where does the pressure relief valve discharge to at the discharge of the Main Hydraulic Pump ?

Answer 22

Routed back to reservoir

Question 23

What happens when you get high DP on the Main Hydraulic Discharge Filters

Question 24

What’re the Fluid Accumulators used for ?

Answer 24

-Reservoir supply line during turbine load transients that can cause rapid movement of steam admission valves
-Provide immediate 200% reserve fluid for transient requirements

Question 25

How are the 4 Accumulators aligned ?

Answer 25

They’re aligned in parallel on common discharge header

Question 26

What’re the Fluid Accumulators precharged with ?

Answer 26

Precharged with 1000psig of nitrogen

Question 27

What do the Hydraulic Fluid Oil Coolers do ? How many are there ?

Answer 27

-Cools Control Oil returning from steam admission valves -There is two 100% capacity Fluid Oil Coolers

Question 28

How’re the Hydraulic Fluid Oil Cooleds aligned ?

Answer 28

They’re aligned in parallel with normally one in service

Question 29

How is the Turbine Cooling Water inlet flow regulated ?

Answer 29

Temperature control valve is controlled by temperature controller to maintain temp. between 110-125

Question 30

What’re the Fullers Earth Filters used for ?

Answer 30

-Maintains control oil pH by absorbing water -Maintains chlorine content of control oil within specifications

Question 31

What is the normal operation of the Fuller Earth Filters ?

Answer 31

Normally kept in continuous operation when turbine in service

Question 32

What other pump can operated the Fuller Earth Filters ?

Answer 32

Motor driven transfer pump can be used for extended maintnence outage

Question 33

What is the Relief Valve setpoint? Where is the relief valve located ?

Answer 33

-Setpoint is 75psig -located downstream both Hydraulic Pumps & FCV-27

Question 34

Where are the two pressure gauges located around the Fuller Earth Filters & what do they indicate ?

Answer 34

One inlet pressure gauge & outlet pressure gauge

Question 35

Why do new Fuller Earth Filters need to be caked for two hours ?

Answer 35

Buildup is required to prevent migration of Fullers Earth particles into the Main Fluid when returned to normal service

Question 36

What is the Flow Path for the Fuller Earths “Caked” process ?

Answer 36

Recirc mode through filters & recirculation tank, back to Hydraulic Fluid Filtering Pump

Question 37

What does the Transfer Pump Filter do ? When should it be replaced?

Answer 37

-Filters hydraulic fluid throughto low particulate size -Needs to be replaced if local inlet gauge reaches 15psig

Question 38

What is the 4-position Filtering Selection Valve V204 used for ?

Answer 38

Used to direct flow to: -Closed -Discharge (drain) -Recirculate to Hydraulic Fluid Reservoir -Recirculate to Recirc. Tank

Question 39

What is the Control Oil Recirculating Tank used for ?

Answer 39

Used during 2hr caking process of the new Fuller Earth Filters

Question 40

What is the Hydraulic Fluid Filtering Pump used for ?

Answer 40

-Pumps control oil through fuller earth filtering when Main Hydraulic pumps are shutdown -Used during power for bypass filtering fluid in reservoir -Used when adding/draining reservoir

Question 41

What kind of switch does the Hydraulic Fluid Filtering Pump ?

Answer 41

Two position start/stop switch that will start or stop pump

Question 42

When does Control Room alarm for Control Oil Header Pressure ?

Answer 42

When Control Oil Header Pressure drops to 1300psig

Question 43

What happens when Control Oil Header Pressure drops to 1100psi ?

Answer 43

If pressure drops to 1100 turbine will trip (2/3 logic)

Question 44

What happens on a loss of Instrument air to Hydraulic Coolers ?

Answer 44

-TC Inlet Valve to coolers will fail open -Oil will become overcooled which,eventually turns on heaters & fans to maintain reservoir temp

Question 45

What happens on a loss of instrument air to the stealth conditioner/dryer ?

Answer 45

This would allow moisture into control oil

Question 46

What happens on loss of TC to the Hydraulic Coolers ?

Answer 46

-Need to place the heater-fan switch to start, to ONLY start fans -If problem is with one cooler, then place other cooler in service

Question 47

What must be previewed before handling Fyrquel EHC Fluid ?

Answer 47

-Chemical Use Permits(CUP) -Material Safety Data Sheets