Chlorinator Systems Flashcards
When chlorine gas is under a vacuum, reliquefaction will
not occur until the temperature drops below ______.
300 F
The pressure in a chlorine cylinder depends on the ______.
Temperature of the chlorine liquid.
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?
Add another cylinder and feed from both.
The pressure-reducing and shutoff valve on a vaporizer will shut off when there is a ________.
loss of electrical power.
What is the purpose of the vacuum in the line to the
chlorine injector?
To shut off chlorine gas flow in case of a leak.
Which device creates the vacuum that is required to operate
the chlorinator?
Injector
What is the maximum chlorine gas withdrawal rate from a
one-ton container at 700 F?
400 lb/d
When opening a chlorine cylinder valve, open only
one turn to ________.
permit maximum withdrawal rate.
Which type of flow meter should be used for chlorinators
which require very low flows?
Rotameter
Aspirators should always be equipped with _________.
an atmospheric vacuum breaker.
A low vacuum condition on a chlorinator can be cause by?
A failed injector.
A high vacuum condition on a chlorinator can be caused by?
An empty chlorine container.
Which type of chlorine gas feeding equipment requires
an external instrument and is often called
“closed-loop control”?
Automatic residual control gas feeder.
Where is scale most likely to form in a
hypochlorinator?
In the suction and discharge hoses.
Because vaporizers operate under pressure, they must
be designed to meet the _________ code.
American Society of Mechanical Engineers
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?
50 to 100 C
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?
20%
At which range of temperatures will fusible plugs on
chlorine cyliners melt?
1570 to 1620 F
When a chlorine cylinder or container is changed, a new
gasket should be used how often?
At every change.
Which is the best type of gasket to use when connecting a
chlorine cylinder or container to the chlorine feed system?
Lead gasket
Will chlorine gas support combustion?
Yes
Chlorine storage rooms should be equipped with a ______.
window in the door so an operator can look into the room to detect any abnormal conditions.
If a substantial chlorine leak incident occurs, which agency should be called for actual hands-on assistance?
The Chemical Transportation Emergency Center
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?
1,500 lbs.
Outdoor storage and handling of 150lb
chlorine cylinders should be _________.
stored on elevated racks to help prevent corrosion.
Which emergency kit is for chlorine
ton containers?
Kit “B”
Which emergency Kit is for chlorine
Tank cars?
Kit “C”
Which emergency Kit is for chlorine
Tank trucks?
Kit “C”
Which is the discharge concentration limit for chlorine
vapor from neutralization system?
5 ppm
Which percentage equipment standby for chlorination
facilities do most states require?
100%
Water treatment plants are increasingly using
hypochlorination because it is ________.
relatively safe compared to using gaseous chlorine.
A common problem with hypochlorinators is ________.
broken diaphragms
Where is the heater located that vaporizes any chlorine
liquid that may develop downline from an online
“One-Ton” container?
Before the chlorinator
The best and most reliable way to detect small chlorine
leaks is by _______. These small leaks are only _______
or less chlorine in air.
- a chlorine leak detector
- 1 ppm
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 _________.
- calcium carbonate.
- HCI.
Chlorine gas can kill a person after just a few breaths at
concentrations as low as _________.
0.1 %
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?
400 lb/d
Chlorine scrubbers are designed to neutralize
up to ________ of chlorine.
2,000 lbs
The valves on chlorine cylinders and ton containers must
comply with standards set by _________.
Chlorine Institute
Chlorine dioxide is _______ in the _______ and _______.
- stable
- absence of light
- elevated temperatures.
The best and most reliable method to find chlorine leaks
is a chlorine detector. These detectors can sense
leaks as small as _______.
1 ppm
The chlorine gas storage area should provide enough
space for a ________.
30 to 60 day supply
Exhaust fan switches for chlorine feed rooms should be
wired to ________ in the room.
emergency lights
The following procedure is safe for changing out chlorine
cylinders or One-Ton containers.
- 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.
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?
Flow proportional control
Chlorine gas has a pungent, noxious odor
and a ________ color.
greenish-yellow
What material lines the pipe that carries the corrosive
chlorine solution from the injector to the point
of application?
PVC
What is the purpose of the chlorinator?
Meter the chlorine gas safely and accurately.
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.
c. will support combustion.
