both vertically and horizontally.
3.4.4
Discharge Strainer
Strainer shall be Y-pattern of suitable size mesh to prevent clogging of
the spray nozzles. Strainer shall be of brass or stainless steel and shall
be accessible for cleaning from the walkway.
3.4.5
Materials for piping and valves shall be as specified in paragraph entitled
"Piping." Hose bibb shall be of brass with 19 mm 3/4 inch hose thread
connection. Union shall be provided adjacent to valves.
3.5
HYPOCHLORINATOR ASSEMBLY
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NOTE: Delete this paragraph and subparagraphs
thereto when hypochlorinator is not required.
Hypochlorinator should be specified for all plants
4.38 L/s 100,000 GPD capacity and below.
Chlorinator should be specified for all plants 6.57
L/s 150,000 GPD capacity and above. Between 4.38
and 6.57 L/s 100,000 and 150,000 GPD capacity either
is suitable. Selection should be made on basis of
existing station or base practices, local
availability, and comparative costs.
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3.5.1
General
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NOTE: Delete reference to heater for plants in
areas where freezing temperatures are not
encountered.
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Hypochlorinator shall pump hypochlorite solution from the solution tank
through tubing to the diffuser located in the chlorine contact tank.
Hypochlorinator assembly shall include feed pump with motor, hypochlorite
mixing tank, hypochlorite solution tank, timer, [heater,] suction and
discharge tubing, diffuser, and housing. Hypochlorinator assembly shall be
readily accessible and located adjacent to the chlorine contact tank.
3.5.2
Hypochlorinator
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NOTE: Insert average daily flow in first blank and
maximum 24 hour flow in second blank. See NAVFAC
DM-5, Figure 10-1.
**************************************************************************
The hypochlorinator shall be a solution feed pump of positive displacement
type designed for feeding sodium or calcium hypochlorite solutions.
Hypochlorinator shall have a capacity to provide an adjustable dosage rate
of not less than 2 to 8 mg/l of chlorine equivalent over a flow range from
[_____] to [_____] L/s [_____] to [_____] gpd. Hypochlorinator shall be
fully automatic and manually adjustable. Hypochlorinator shall have
diaphragm type or peristaltic type pump.
SECTION 11375N
Page 109
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