Chlorinator Systems

Question 1

When chlorine gas is under a vacuum, reliquefaction will

not occur until the temperature drops below ______.

Answer 1

30⁰ F

Question 2

The pressure in a chlorine cylinder depends on the ______.

Answer 2

Temperature of the chlorine liquid.

Question 3

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?

Answer 3

Add another cylinder and feed from both.

Question 4

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

Answer 4

loss of electrical power.

Question 5

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

chlorine injector?

Answer 5

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

Question 6

Which device creates the vacuum that is required to operate

the chlorinator?

Answer 6

Injector

Question 7

What is the maximum chlorine gas withdrawal rate from a

one-ton container at 70⁰ F?

Answer 7

400 lb/d

Question 8

When opening a chlorine cylinder valve, open only

one turn to ________.

Answer 8

permit maximum withdrawal rate.

Question 9

Which type of flow meter should be used for chlorinators

which require very low flows?

Answer 9

Rotameter

Question 10

Aspirators should always be equipped with _________.

Answer 10

an atmospheric vacuum breaker.

Question 11

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

Answer 11

A failed injector.

Question 12

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

Answer 12

An empty chlorine container.

Question 13

Which type of chlorine gas feeding equipment requires

an external instrument and is often called

“closed-loop control”?

Answer 13

Automatic residual control gas feeder.

Question 14

Where is scale most likely to form in a

hypochlorinator?

Answer 14

In the suction and discharge hoses.

Question 15

Because vaporizers operate under pressure, they must

be designed to meet the _________ code.

Answer 15

American Society of Mechanical Engineers

Question 16

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?

Answer 16

5⁰ to 10⁰ C

Question 17

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?

Answer 17

20%

Question 18

At which range of temperatures will fusible plugs on

chlorine cyliners melt?

Answer 18

157⁰ to 162⁰ F

Question 19

When a chlorine cylinder or container is changed, a new

gasket should be used how often?

Answer 19

At every change.

Question 20

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

chlorine cylinder or container to the chlorine feed system?

Answer 20

Lead gasket

Question 21

Will chlorine gas support combustion?

Answer 21

Yes

Question 22

Chlorine storage rooms should be equipped with a ______.

Answer 22

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

Question 23

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

Answer 23

The Chemical Transportation Emergency Center

Question 24

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?

Answer 24

1,500 lbs.

Question 25

Outdoor storage and handling of 150lb chlorine cylinders should be \_\_\_\_\_\_\_\_\_.

Answer 25

stored on elevated racks to help prevent corrosion.

Question 26

Which emergency kit is for chlorine ton containers?

Answer 26

Kit "B"

Question 27

Which emergency Kit is for chlorine Tank cars?

Answer 27

Kit "C"

Question 28

Which emergency Kit is for chlorine Tank trucks?

Answer 28

Kit "C"

Question 29

Which is the discharge concentration limit for chlorine vapor from neutralization system?

Answer 29

5 ppm

Question 30

Which percentage equipment standby for chlorination facilities do most states require?

Answer 30

100%

Question 31

Water treatment plants are increasingly using _hypochlorination_ because it is \_\_\_\_\_\_\_\_.

Answer 31

relatively safe compared to using gaseous chlorine.

Question 32

A common problem with hypochlorinators is \_\_\_\_\_\_\_\_.

Answer 32

broken diaphragms

Question 33

Where is the heater located that vaporizes any chlorine liquid that may develop downline from an online "One-Ton" container?

Answer 33

Before the chlorinator

Question 34

The best and most reliable way to detect small chlorine leaks is by \_\_\_\_\_\_\_. These small leaks are only \_\_\_\_\_\_\_ or less chlorine in air.

Answer 34

- a chlorine leak detector - 1 ppm

Question 35

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 \_\_\_\_\_\_\_\_\_.

Answer 35

- calcium carbonate. - HCI.

Question 36

Chlorine gas can kill a person after just a few breaths at concentrations as low as \_\_\_\_\_\_\_\_\_.

Answer 36

0.1 %

Question 37

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?

Answer 37

400 lb/d

Question 38

Chlorine scrubbers are designed to neutralize up to ________ of chlorine.

Answer 38

2,000 lbs

Question 39

The valves on chlorine cylinders and ton containers must comply with standards set by \_\_\_\_\_\_\_\_\_.

Answer 39

Chlorine Institute

Question 40

Chlorine dioxide is _______ in the _______ and \_\_\_\_\_\_\_.

Answer 40

- stable - absence of light - elevated temperatures.

Question 41

The best and most reliable method to find chlorine leaks is a chlorine detector. These detectors can sense leaks as small as \_\_\_\_\_\_\_.

Answer 41

1 ppm

Question 42

The chlorine gas storage area should provide enough space for a \_\_\_\_\_\_\_\_.

Answer 42

30 to 60 day supply

Question 43

Exhaust fan switches for chlorine feed rooms should be wired to ________ in the room.

Answer 43

emergency lights

Question 44

The following procedure is safe for changing out chlorine cylinders or One-Ton containers.

Answer 44

- 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.

Question 45

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?

Answer 45

Flow proportional control

Question 46

Chlorine gas has a pungent, noxious odor and a ________ color.

Answer 46

greenish-yellow

Question 47

What material lines the pipe that carries the corrosive chlorine solution from the injector to the point of application?

Answer 47

PVC

Question 48

What is the purpose of the chlorinator?

Answer 48

Meter the chlorine gas safely and accurately.

Question 49

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.

Answer 49

c. will support combustion.