[_____] phase, 60 Hz.
2.9.3
Diffuser
A diffuser shall be provided to effectively disperse the chlorine solution
into the wastewater flow. The diffuser shall be constructed of PVC plastic
or other material resistant to the highly corrosive wet chlorine
atmosphere. The diffuser shall be installed at a point of local
turbulence, such as the outfall from a weir, to achieve rapid and thorough
mixing with the plant effluent.
2.9.4
Chlorinator Enclosure
An insulated weatherproof enclosure with a thermostatically controlled
heater shall be provided to house the chlorinator. The enclosure shall
have lockable access doors and shall be louvered for ventilation. The
enclosure shall be aluminum, galvanized steel, or mild steel with a
factory-applied finish.
2.9.5
Piping in the chlorination system shall be Schedule 80 PVC with solvent
weld joints. Gas valves shall be bronze or plastic construction. Valves
in contact with chlorine solution shall be PVC or rubber-lined steel.
2.9.6
Cylinder Scale
A cylinder scale shall be provided for determining the amount of chlorine
remaining in the supply cylinder. Capacity of the scale shall be [_____]
kg pounds with an accuracy of 2 percent of full scale. The scale shall be
located within the chlorinator enclosure.
2.9.7
Gas Mask
A gas mask shall be provided to protect against chlorine gas inhalation.
The gas mask shall comply with ANSI Z88.2 . The mask shall be stored in a
weatherproof enclosure outside the building immediately adjacent to the
entrance.
2.10
CALCIUM HYPOCHLORITE CHLORINATION SYSTEM
**************************************************************************
NOTE: Delete inapplicable chlorination system (GAS
CHLORINATION SYSTEM or CALCIUM HYPOCHLORITE
CHLORINATION SYSTEM).
**************************************************************************
A system shall be provided for the disinfection of the treatment plant
effluent using calcium hypochlorite solution. The system shall include a
chemical solution tank with mixer and liquid-level switch, a metering pump,
diffusers, pipe, valves, and controls. The system shall automatically
regulate the chlorine feed rate in proportion to the wastewater flow.
2.10.1
Chemical Solution Tank
The tank shall be polyethylene and shall have a capacity of [115] [190] L
[30] [50] gallons. The cover shall be fiberglass reinforced plastic of
sufficient strength to support the mixer. The mixer shall be electric
motor driven impeller type mixer capable of mixing and maintaining the
SECTION 11390
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