TM 5-814-3/AFM 88-11, Volume III
a. Direct-feed chlorinator. The use of equipment for feeding chlorine gas from the cylinder through a
control apparatus to the point of application is not permitted except under special conditions which prevent
the use of solution-feed chlorinators.
b. Solution-feed chlorinator. Pressure feed and vacuum feed are, in general, two types of solution
feeders. The vacuum-feed type chlorinator is the preferred type, and will be used for all installations where
a suitable make-up water supply is available (such as potable water or suitable plant effluent).
c. Hypochlorite feeders. These feeders are of the mechanical, positive-displacement metering type and
their use will be limited to installations designed for the addition of hypochlorite solution. All plants with
flows of 0.02 million gallons per day or less will use this method of chlorination.
d. Scales. Scales will be sized to accommodate the maximum number of cylinders required to serve the
maximum chlorine rate. They may be mounted flush with the floor or on the floor surface within an enclosing
box. With above-floor mounting, overhead hoist equipment must be considered. Flush-mounted scales will
require drainage of the scale sump. A loss-of-weight recorder is desirable to provide a continuous record of
e. Electric hoisting equipment. Electric hoisting equipment will be provided for installation, using 1-ton
cylinders. Hoists will have a minimum capacity of 2 tons and will be equipped with an approved type of
lifting-beam container grab.
f. Piping. Only pipe and materials approved by the manufacturers of chlorine equipment will be used in
chlorine installations. Piping and valves will be color coded.
(1) Room separation. If chlorinators or cylinders are in a building used for other purposes, a gas-tight
partition will separate the chlorine room from any other portion of the building. Doors to the room will open
only to the outside of the building and will be equipped with panic hardware. The storage area will be
separated from the feed area.
(2) Inspection window. A clear glass, gas-tight window will be installed in an exterior door or interior
wall of the chlorinator room to permit the chlorinator to be veiwed without entering the room.
(3) Heat. Chlorine equipment rooms will be provided with a means of heating so that a room temperature
of at least 60 degrees Fahrenheit can be maintained. This will help to prevent the formation of chlorine
hydrate in the chlorinator.
(4) Ventilation. Forced mechanical ventilation, which will provide one complete air change every 3
minutes, will be installed. The entrance to the air exhaust will be located so as not to contaminate the air inlet
to any building or inhabited areas. air inlets will be located to provide cross-ventilation. Th prevent a fan from
developing a vacuum in the room, thereby making it difficult to open the doors, louvers should be provided
above the entrance door and opposite the fan suction. Where duct work is required to carry air to the fan,
it should be laid out so that the suction openings are at floor level and spaced so as to exhaust air from all
equipment areas. Exhaust openings should be designed so that covers are not required.
(5) Electrical controls. A common control for the fans and lights, keyed to an exterior lock on the
entrance door so that they will automatically come on when the door is opened; will only be deactivated by
relocking the door externally; and can also be manually operated from the outside without opening the door.
An interlock between the entrance door lock and the exhaust fan should be installed so that the fan will be
actuated when the door is unlocked.
(6) Cylinder storage. A storge area will be provided to allow for a minimum 15-day inventory of reserve
and empty cylinders. Cylinders may be stored outdoors on suitable platforms at or above grade under cover
in a well-ventilated, fireproof structure.