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Control Room > Control Room Questions > Flashcards

Control Room Questions Flashcards

1
Q

What are the interlocks of the pulper pump?

A

Hydrapulper level low

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2
Q

First step in cold start up procedure?

A

Walk down entire system. Make sure all the drains are closed, pumps are in dcs and breakers are thrown in. Check all manual valves. Notify control room when complete

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3
Q

What day is effluent compliance?

A

Tuesday from 7am - Wednesday 7am (24 hrs)

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4
Q

What forms/permits are the control room operators responsible for?

A

Red tag (fire system), hot work, fire pump usage, start up/shutdown checklist, boiler pop off checks, boiler trip checks, elog

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5
Q

What’s the maximum allowed flow to the city? What is our target? Compliance day?

A

1.6 million gallons
Target- 1.3 million gallons
Compliance day- 650,000

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6
Q

What’s the allowed ph range to the city?

A

5.5-9.0

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7
Q

What do you do if the mill water pressure drops out?

A

Check usage page and make sure something isn’t pulling more flow than normal. If not call the city

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8
Q

What are potential causes of low pressure on the showers?

A

Barrel filters are plugged make sure they’re cycling

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9
Q

How do you bypass the float purger?

A

Swap chain valves, click the bypass button

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10
Q

Why would you close off overflow and bypass valves out in the pond?

A

Upset situations, shut down days, potential chemical spill, going over compliance

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11
Q

Can you tell from the dcs that an air compressor has dropped out?

A

Yes. Go to your utility page and it has the kilowatts for each compressor

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12
Q

What areas outside of the mill is occ responsible for?

A

Mill water cooling tower, pond, aerators, bunker, parshall flume.

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13
Q

What’s the purpose of the bypass on the pumps?

A

So that one step can have an isolated shutdown and not shut down the process

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14
Q

What are the interlocks on the rotor?

A

Lube unit not running (temp/pressure) seal water pressure low

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15
Q

How do you know if you have a broken oscillating shower head?

A

Low pressure on your shower water.

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16
Q

What are the responsibilities around the fire system?

A

Report, red tag, eyes on pumps, weekly checks, gaitronics/ radio communication

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17
Q

What can be potential causes of a screen having a low load?

A

Belts burnt off, hole in basket

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18
Q

Why would you want to bypass the float purger?

A

To shutdown and work on the float purger or secondary course

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19
Q

How do you ensure you aren’t back flowing into the chest.

A

Make sure the accepts and rejects combined is greater than the feed

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20
Q

How do you safely do a bump check?

A

Good communication between field tech and control room

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21
Q

What are interlocks on the thickener?

A

Shower water valve, shower water pressure, shower speed and repulper

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22
Q

During non staff hours what are control room operators responsibility’s during upset conditions?

A

Assist with communication to staff/management keep the phone line clear

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23
Q

How do you respond to a pink ready light?

A

Make sure local switch is in dcs, check breaker

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24
Q

What steps do you do when a screen blinds over?

A

Cut back on accepts, open rejects ad dilution

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25
Q

What is the importance of having gray water going to primary fine screens?

A

Dilution and make sure we aren’t back flowing into gray chest

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26
Q

What are ways to help field tech unplug the cyclones?

A

Add back pressure

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27
Q

What’s the time interval between starting up quat feed pump and the primary feed pump before it shuts back down?

A

75 seconds

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28
Q

What are the interlocks on the mc pump?

A

Clear white water shower pump, standpipe low level, seal water flow low for 1 hour

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29
Q

What do you do in response to a high level?

A

Spin the wagon wheel or cut back flow to the thickener

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30
Q

What are interlocks on hydra purge?

A

Seal water pressure low, e stop

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31
Q

What are interlocks on scavenger?

A

Seal water pressure low, e stop

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32
Q

What to do at a high load on reject sorters?

A

Dump the float purger, adjust dump times, worst case send to screw presses

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33
Q

Why/How would you apply a step change?

A

Why- if it’s hung up in a step, didn’t have time to go through complete shutdown sequence.

How- click apply step change button

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34
Q

How to tell pressure in cleaners?

A

Manual gauge in field

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35
Q

How is level controlled in thickener?

A

By the speed of the thickener

36
Q

Why would you pay attention to gallon flow and pressure on screens?

A

Plugging

37
Q

How do you know something is wrong with repulper screw?

A

Lose the load, speed switch will trip, lose level in the mc standpipe

38
Q

What do you do if the rotor trips?

A

Make sure stock dilution is at 0, shut down the sumps

39
Q

How do you shut down scavapurge?

A

Hit the shutdown button on the face plate

40
Q

What do you do when a screen has a high load?

A

Dilution, cut off feed

41
Q

What’s the purpose of dilution water?

A

Dilution

42
Q

What are interlocks on the mill water cooling tower supply pump?

A

Valve has to be open greater than 30%, white water tank level low for 10 min

43
Q

What is the purpose of the water into the repulper?

A

Used to help consistency, amp load, and to covey the stock down the repulper screw

44
Q

What are the interlocks of the reject sorters?

A

Shower water valve must be open, speed low, vibration high, clear white water low pressure pump

45
Q

If you lose reject flow how do you get it back?

A

Open reject, close back accepts until pressure equalizes (if all else fails start/stop pump)

46
Q

Why would you thicken up while pulling broke while paper machine is down?

A

To use more water so you aren’t overflowing the chests

47
Q

Why does it trip out at low level?

A

At a certain point the blade on the agitator came out of the water

48
Q

How would you react to the secondary reverse cleaner standpipe over flowing?

A

Turn the bypass on and start/stop the pump. Due to cavitation of the pump

49
Q

If you can’t get a start on the conveyor what are the possible causes?

A

Pulped not running, rotor no turning, hydraulics on cutter, pulper high level, overloaded conveyor, e stop, breaker on conveyor

50
Q

How to start the scavapurge?

A

Must hit scavapurge, then start button

51
Q

What’s the purpose of the pause/play button?

A

Pause hold it right where it’s at. Play- normal operation

52
Q

How do you know when to do an offline cleaning for the petax?

A

Feed pressure gets high

53
Q

What would kick out the agitator?

A

Low level

54
Q

What the proper way to cut back the feed?

A

Cut feed to primary reverse first, accept from primary reverse second (vice versa to add flow back)

55
Q

What are potential causes of low load on the hydra purge?

A

It could be plugged, rotor is off

56
Q

How do you empty the pulper out?

A

Turn on bypass

57
Q

What’s a permissive on the screens?

A

Must have seal water to start, once pump starts seal water shuts off

58
Q

What should the dilution valve position on the fru’s prior to start up?

A

30% or less

59
Q

How does the temperature control loop work?

A

Temp drops - flow goes to basin.

Temp rises - flow goes through tower and fans turn on

60
Q

How and when to force a regin

A

High hardness, change total gallon flow, or advance softener steps

61
Q

What direction does the water flow between chest?

A

Clear to dirty

Clear - gray - course

62
Q

What are reasons your cleaner pumps won’t start?

A

Breaker, dcs switch, gray water valve closed

63
Q

What are ways to dilute the fine screens if the DP or load gets high

A

Cut back on accepts from course screens, pulling more gray water, open up the dilution going to primary course

64
Q

What can be a common cause of the scavenger sequence interrupting?

A

A valve has timed out trying to open/close (valve hung up)

65
Q

Reasons for running dlk?

A

Clean the system out, helps through put

66
Q

Why is it important to notify inbound before starting conveyor?

A

So a gap doesn’t form on the line, safety concern for inbound techs

67
Q

What is the theory of the clarifier?

A

Recycled water is taken from the clarifier and pumped through the recirculation pump to the ADT where it is mixed with air and sent back through the feed line that mixes with polymers which makes stock stick together and floats up by air bubbles. A rotating spiral scoop takes sludge off the top and lets it slide to the center ring to the screw presses. The drain blows down sand to the screw presses and the clarified water goes to the gray chest

68
Q

Describe how the primary reverse cleaners work?

A

Feed comes in towards the middle, centrifugal force develops a separation and the accepts go out the bottom and the rejects go out the top

69
Q

Respond to a broken ragged tail what are the steps to starting a new tail?

A

Make pull rope and ragged rope, put barriers in place and turn warning light on, pull any ragged tail left in ragged drum, hook pull rope to winch, lower to pull broken ragged tail all the way out, hook ragged to winch and lower to start new tail

70
Q

What is the proper PPE for power washing

A

Goggles, face shield with chin guard, apron, steel toe boots, metatarsals, and gloves

71
Q

What’s the general purpose of the disc thickener?

A

To thicken the stock from the primary reverse cleaners and to send the desired consistency to the HD chest. Also a source to pull broke

72
Q

What’s the purpose of the pulper lube unit

A

Lubricate hydrapulper gears and keep them cool

73
Q

Purpose of reject sorters

A

Last stage of recovery for the coarse screen reject loop

74
Q

What is the purpose of the pulper

A

To permit pulped occ or stock to leave the tub whenever the correct material size is reached

75
Q

Purpose of cyclones

A

To remove high and medium specific gravity contaminants from the stock

76
Q

The purpose of screens

A

To remove oversized troublesome and unwanted particles from the good fiber

77
Q

What’s the purpose of the float purger

A

To reclaim fiber from the coarse screen rejects

78
Q

How many coarse screens and fine screens do we have

A

2 coarse screens and 4 fine screens

79
Q

Purpose of the scavenger / hydrapurger system

A

To remove light and heavy weight contaminants from the hydrapulper

80
Q

Explain the steps how to clean the MP shower filters

A

Close MP valve, lock, turn to hand, remove cap, pull filter, power wash with proper ppe

81
Q

What does rst stand for

A

Rotary screen thickener

82
Q

Loacation of main control valves v1, v2, v3, v6, v8, v9, v10, v11, and v12

A 
V1- inlet to scavenger 
V2- scavenger dump valve
V3- top of scavenger. Wash water for scavenger
V6- top of scavenger flush water for v1 line
V8- discharge scavenger to hydrapurger 
V10- stock dilution for wash
V11- hydrapurger accepts back to pulper
V12- hydrapurger accepts to pulper pump
83
Q

What is ADT

A

Air dissolving tube

84
Q

What is the purpose of the forward cleaners

A

To remove contaminants that weigh more than stock

85
Q

What are the process clarifier inputs

A

Cleaners reject tank, polymer, air

86
Q

Location of hydrapulper feed conveyor e-stop

A

Runs along side of conveyor with the cat walk

87
Q

Where do the accepts from the primary forward cleaners go

A

Primary reverse cleaners feed pump

Control Room (2 decks)

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