of AWWA B100.
2.6.4
Distributor/Collector
Each filter shall be provided with an influent distributor/backwash
collector of the [central manifold] [lateral arm] [_____] type. The
influent distributor and waste water collector shall be fabricated as an
integral part of the filter tank. The system shall be constructed from
[steel] [aluminum] [fiberglass] [_____] of the manufacturer's standard
design.
2.6.5
Surface Wash Agitators
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NOTE: Since surface wash systems vary greatly,
additional information regarding the strength,
construction, method of connection and nozzle size
and type may be required to adequately specify
surface wash agitators. The designer is required to
add this information and any other additional
information necessary for adequate specification.
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Each filter shall be provided with a [straight line] [S-shaped] [_____],
[single] [double] arm [rotary] [fixed] agitator constructed of [stainless
steel] [brass-bronze] [_____] components. Design of the agitator shall
create the most efficient degree of agitation to all portions of the
filter. Each agitator shall be capable of discharging [_____] L cubic feet
per minute of water at an operating pressure of [_____] Pa psi. Maximum
increase in bed expansion from surface wash is [_____] percent.
2.6.6
Air Scour System
2.6.6.1
Air Wash Distribution
Each tank shall be provided with a separate air wash distributor. The
distributor shall consist of a [brass] [red brass] [_____], [_____] mm inch
air header with [_____] mm inch slotted [brass] [red brass] laterals on
approximately [_____] mm inch center. [Air shall be introduced to the
media bed through the underdrain system.] [Air shall be introduced at the
top of the [gravel support layer] [underdrain].] Allowable headloss up the
wall of the filter shall be [_____] L/minute per square meter cubic feet
per minute per square foot at [_____] mm inch of water column.
2.6.6.2
Air Blower
A positive displacement air blower shall be supplied for supplemental air
wash. The blower shall have a minimum capacity of [_____] L cubic feet per
minute at [_____] Pa psi discharge pressure and shall be supplied in
accordance with the requirements of Section 15400APLUMBING, GENERAL PURPOSE.
2.6.7
Equipment Control
2.6.7.1
Control Valves
The filter influent, backwash, waste, rinse, and surface wash valves shall
allow for automatic operation of each filter unit.
SECTION 11393
Page 29
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