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Water Treatment > Chlorinator Systems > Flashcards

Chlorinator Systems Flashcards

1
Q

When chlorine gas is under a vacuum, reliquefaction will

not occur until the temperature drops below ______.

A

300 F

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2
Q

The pressure in a chlorine cylinder depends on the ______.

A

Temperature of the chlorine liquid.

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3
Q

A single chlorine cylinder is delivering 48 lb/d of chlorine to the water process, causing the cylinder to form a little frost. Which would be the best solution to this problem?

A

Add another cylinder and feed from both.

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4
Q

The pressure-reducing and shutoff valve on a vaporizer will shut off when there is a ________.

A

loss of electrical power.

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5
Q

What is the purpose of the vacuum in the line to the

chlorine injector?

A

To shut off chlorine gas flow in case of a leak.

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6
Q

Which device creates the vacuum that is required to operate

the chlorinator?

A

Injector

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7
Q

What is the maximum chlorine gas withdrawal rate from a

one-ton container at 700 F?

A

400 lb/d

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8
Q

When opening a chlorine cylinder valve, open only

one turn to ________.

A

permit maximum withdrawal rate.

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9
Q

Which type of flow meter should be used for chlorinators

which require very low flows?

A

Rotameter

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10
Q

Aspirators should always be equipped with _________.

A

an atmospheric vacuum breaker.

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11
Q

A low vacuum condition on a chlorinator can be cause by?

A

A failed injector.

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12
Q

A high vacuum condition on a chlorinator can be caused by?

A

An empty chlorine container.

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13
Q

Which type of chlorine gas feeding equipment requires

an external instrument and is often called

“closed-loop control”?

A

Automatic residual control gas feeder.

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14
Q

Where is scale most likely to form in a

hypochlorinator?

A

In the suction and discharge hoses.

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15
Q

Because vaporizers operate under pressure, they must

be designed to meet the _________ code.

A

American Society of Mechanical Engineers

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16
Q

Which temperature range of superheat is considered

sufficient, when comparing the off-gas temperature from

the vaporizer to its position on the chlorine or ammonia vapor pressure curves?

A

50 to 100 C

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17
Q

In vaporizer systems, expansion chambers must be installed

in a liquid line between any two valves to protect against

over-pressurizing the liquid line. The expansion chamber

must be sized to protect which percentage of the

line volume?

A

20%

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18
Q

At which range of temperatures will fusible plugs on

chlorine cyliners melt?

A

1570 to 1620 F

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19
Q

When a chlorine cylinder or container is changed, a new

gasket should be used how often?

A

At every change.

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20
Q

Which is the best type of gasket to use when connecting a

chlorine cylinder or container to the chlorine feed system?

A

Lead gasket

21
Q

Will chlorine gas support combustion?

A

Yes

22
Q

Chlorine storage rooms should be equipped with a ______.

A

window in the door so an operator can look into the room to detect any abnormal conditions.

23
Q

If a substantial chlorine leak incident occurs, which agency should be called for actual hands-on assistance?

A

The Chemical Transportation Emergency Center

24
Q

Sites are required to do a site assessment under the

Process Safety Management (PSM) regulations (OSHA)

if the facility in a single process has more than how many

pounds of chlorine?

A

1,500 lbs.

25
Q

Outdoor storage and handling of 150lb

chlorine cylinders should be _________.

A

stored on elevated racks to help prevent corrosion.

26
Q

Which emergency kit is for chlorine

ton containers?

A

Kit “B”

27
Q

Which emergency Kit is for chlorine

Tank cars?

A

Kit “C”

28
Q

Which emergency Kit is for chlorine

Tank trucks?

A

Kit “C”

29
Q

Which is the discharge concentration limit for chlorine

vapor from neutralization system?

A

5 ppm

30
Q

Which percentage equipment standby for chlorination

facilities do most states require?

A

100%

31
Q

Water treatment plants are increasingly using

hypochlorination because it is ________.

A

relatively safe compared to using gaseous chlorine.

32
Q

A common problem with hypochlorinators is ________.

A

broken diaphragms

33
Q

Where is the heater located that vaporizes any chlorine

liquid that may develop downline from an online

“One-Ton” container?

A

Before the chlorinator

34
Q

The best and most reliable way to detect small chlorine

leaks is by _______. These small leaks are only _______

or less chlorine in air.

A
  • a chlorine leak detector
  • 1 ppm
35
Q

The primary problem with hypochlorinators is that they

can clog with _______. However, this material can be

removed by pumping through the pump, hoses, and

diffuser a dilute solution of _________.

A
  • calcium carbonate.
  • HCI.
36
Q

Chlorine gas can kill a person after just a few breaths at

concentrations as low as _________.

A

0.1 %

37
Q

What is the maximum withdrawal rate for a One-Ton

Chlorine container to prevent frosting if the backpressure

is 35 psig and the container is at room temperature?

A

400 lb/d

38
Q

Chlorine scrubbers are designed to neutralize

up to ________ of chlorine.

A

2,000 lbs

39
Q

The valves on chlorine cylinders and ton containers must

comply with standards set by _________.

A

Chlorine Institute

40
Q

Chlorine dioxide is _______ in the _______ and _______.

A
  • stable
  • absence of light
  • elevated temperatures.
41
Q

The best and most reliable method to find chlorine leaks

is a chlorine detector. These detectors can sense

leaks as small as _______.

A

1 ppm

42
Q

The chlorine gas storage area should provide enough

space for a ________.

A

30 to 60 day supply

43
Q

Exhaust fan switches for chlorine feed rooms should be

wired to ________ in the room.

A

emergency lights

44
Q

The following procedure is safe for changing out chlorine

cylinders or One-Ton containers.

A
  • After removing the brass outlet cap, clean the valve and threads with a wire brush.
  • Always use a new washer.
  • Always have a personal protective respirator nearby.
45
Q

What is the most appropriate chlorine gas solution controller

to use if the chlorine demand rarely changes and it is

necessary to compensate only for changes in the

pumping rate?

A

Flow proportional control

46
Q

Chlorine gas has a pungent, noxious odor

and a ________ color.

A

greenish-yellow

47
Q

What material lines the pipe that carries the corrosive

chlorine solution from the injector to the point

of application?

A

PVC

48
Q

What is the purpose of the chlorinator?

A

Meter the chlorine gas safely and accurately.

49
Q

Chlorine gas ________.

a. will burn in the presence of oxygen and moisture.
b. will explode in the presence of oxygen and an ignition source.
c. will support combustion.
d. will conduct electricity.

A

c. will support combustion.

Water Treatment (16 decks)

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