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Secondary > Condensate Demineralizer System > Flashcards

Condensate Demineralizer System Flashcards

1
Q

The CD demins are capable of handling what severity of a condenser leak and for how long?

A

1 GPM on a continuous basis

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2
Q

What vessels are in service during full flow?

A

5 vessels and 1 in standby with blowdown demins in bypass

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3
Q

What vessels are in service during full bypass?

A

none, all 6 in standby with blowdown demins in service

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4
Q

what is decon factor?

A

concentration in/concentration out

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5
Q

What is meant by resin spent or saturated?

A

saturated with impurities

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6
Q

What is the pressure in the demins?

A

460

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7
Q

What is meant by standby?

A

inlet open and outlet closed

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8
Q

What would high D/P across a demin indicate?

A

clogged resin trap

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9
Q

what would low D/P indicate?

A

Channeling thru the resin bed

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10
Q

What is the purpose of the resin traps?

A

To catch resin before it goes to the SGs

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11
Q

What system provides air for resin transfer, cleaning and mixing of resin?

A

service air

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12
Q

What system provides motive air for AOV in CD demin valves?

A

IA

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13
Q

What cools the demin sample coolers?

A

WC normal chilled water

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14
Q

What system provides chemical needed for cation resin regen and what chemical is used?

A

System - Chlorine injection

Acid

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15
Q

What is used to regen anion resin and where does it come from?

A

System - chemical production

Caustic and it comes from water resources

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16
Q

What does NH do for the CD demin system?

A

powers the pumps in the system and heaters for the caustic tank

Also powers the PLC

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17
Q

What is the resin ratio?

A

2 to 1
Cation 2 and anion 1

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18
Q

Where can the demin outlet valves be controlled from?

A

Normally the control room
Can be at the local panel

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19
Q

What is the purpose of the 4 white indicating lights?

A

shows when vessel is in service, standby, resin transfer, or resin rinse

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20
Q

How may switches are at the local panel for each vessel?

A

six switches
There is a selector switch to determine which switches are going to be operated

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21
Q

Why is a slow pressurization of a service vessel necessary?

A

To not displace resin bed with the high pressure of the condensate header

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22
Q

What do the red lights mean?

A

Rinse, resin transfer and crud removal

23
Q

What light indicates vessel is in service?

A

green

24
Q

PLC performs what 5 processes?

A

Full regeneration
Partial regeneration
Service vessel to cation vessel
in vessel air max
mix and hold to service vessel

25
Q

What is purpose of the PLC?

A

used to start or stop the automatic regeneration or resin transfer cycles

26
Q

What do we use the cation regeneration vessel for?

A

Used for cation-anion resin separation and cation regeneration

27
Q

Where does the resin addition hopper drain to?

A

cation vessel

28
Q

What happens if pressure gets too low on the inlet of the cation vessel?

A

Vent valve is interlocked with a pressure switch that will cause the valve to go closed

29
Q

When the air scrubs are in automatic, how long will the pressure switch reverse flow to unplug the screen?

A

30 seconds

30
Q

What is the cation resin cleaning cycle?

A

Cation vessel timer that lowers water level to the resin bed level

Air scrub timer

Compact resin timer

Backwash timer

Number of cleaning cycles

31
Q

What is the anion resin cleaning cycle?

A

Anion vessel timer that lowers water level to the resin bed level

Air scrub timer

Compact resin timer

Backwash timer

Number of cleaning cycles

32
Q

What is the purpose of the mix and hold regen vessel?

A

Receives anion and cation resins until it is ready to be transferred to a service vessel or the blowdown demin system

33
Q

What is the purpose of the acid day tank?

A

400 gallon tank that contains 93-96% sulfuric acid used for cation regen

34
Q

How do we determine the level in the acid day tank?

A

Ultrasonic detector that displays on a local meter

35
Q

How is the acid day tank fill valve interlocked with the level switch in the tank?

A

Fill valve closes on high level in the tank

36
Q

What type of pumps are the 2 acid pumps?

A

Positive displacement

37
Q

What are the 2 interlocks with the acid pumps?

A

low level in the tank

flow switch measures dilution water flow to the mixing tee will stop the acid pump on a low flow

When outlet valves open, drain valves closes

38
Q

What is the purpose of the caustic day tank?

A

2500 gallon tank that contains 8% sodium hydroxide solution used regenerate anion resin

39
Q

How is the caustic day tank fill valve interlocked with the level switch in the tank?

A

Fill valve closes on a high-high level in the tank

40
Q

What is the purpose of the three banks of heaters in the caustic day tank?

A

Maintain the caustic at 115-120F

41
Q

What type of pumps are the two caustic pumps?

A

Centrifugal

42
Q

What is the purpose of the caustic pumps?

A

Supply caustic solution from the caustic day tank to the anion regen vessel

43
Q

What would cause the caustic pumps to shut off automatically?

A

Tank low level

44
Q

What is the purpose of the regen water transfer pumps and where are they located?

A

Take suction on the CST and supply water for various resin transfer operations

Located on concrete skid north of the CST

45
Q

Concerning the waste collection tank, where is water directed to from X2 discharge valve?

A

High TDS sump, which can be discharged to the CWNT

Normally used at the beginning of the regen process prior to sampling by effluents and during acid and caustic injection when conductivity is very high

46
Q

Where does X1 direct the water to?

A

Waste water (less than 1000 ohms) to the low TDS sump, which is then typically pumped to the CW system

47
Q

What is the purpose of the turbine building acid transfer pump?

A

Provide acid to the day tank in the CD demin system

Provide acid injection for pH control in the CWNT

48
Q

Where are the turbine building acid pumps?

A

by acid storage tanks outside

49
Q

What powers the turbine building acid pumps?

A

NH

50
Q

Why does the turbine building acid transfer pump have a bleed hole in its discharge check valve?

A

to assist in overpressure protection of acid

51
Q

What feature of these pumps help prevent mechanical seals that could possibly leak?

A

Magnetic shaft coupling

52
Q

What signal could stop the turbine building acid transfer pumps?

A

low low level in either storage tank

53
Q

What is the capacity of the turbine building acid storage tanks?

A

11,000 gallons

Secondary (26 decks)

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