2.4.7.1
Pneumatic Controls
The pneumatic controls shall consist of a pressure gauge and a flowmeter.
The pressure gauge shall be panel mounted with a [_____] to [_____] Pa psi
range and a [_____] mm inch face. The flowmeter shall be of the variable
area type with a stainless steel indicator. The meter shall have a
metering valve, [_____] mm inch scale, and a range of [_____] to [_____]
cubic meters cubic feet per minute. Both devices shall be mounted on a
hinged panel and shall be visible through a window in the control enclosure.
2.4.7.2
Headloss Switch
A headloss switch shall be supplied to signal when the media bed is
beginning to foul. The switch contacts shall be rated at [_____] amps and
shall be connected to [an alarm] [process controls] [purge valve] [_____].
2.4.8
Equipment Control Panel
The equipment manufacturer shall furnish a control panel containing all
necessary timers, contact switches, internal wiring, completely assembled
and mounted in a NEMA [4] [4X] [12] [_____] enclosure. The control panel
shall provide for [automatically starting and stopping pumps] [manual
operation of the control valves] [_____]. The Contractor shall mount the
control panel on the filter unit and provide electrical wiring and
connections external to the unit.
2.4.9
Flowmeters
Influent and effluent lines shall be equipped with [kennison nozzle]
[parshall flume] [shuntflo steam] [sonic] [_____] flowmeters.
2.5
TRAVELLING BRIDGE FILTER
2.5.1
Tank
The tank shall be [_____] wide by [_____] long by [_____] deep and be
constructed of [_____] thick [mild steel] [carbon steel] [_____]. The
assembled tank shall be constructed to allow loading and unloading as a
unit and shall be equipped with lifting lugs. Integral supports shall be
furnished so that the body of the tank, when installed, will be [_____] mm
inches above the concrete slab. The placement of the supports shall allow
for full inspection of the underside of the tank. Tank shall be
constructed in accordance with Paragraph Tank Requirements and prepared in
accordance with the requirements of Paragraph PAINTING and Paragraph
MATERIALS PROTECTION.
2.5.2
Filter Bed
2.5.2.1
Cell Dividers
The filter bed shall be [_____] wide by [_____] long and shall consist of a
series of self-supporting lateral partitions (cell dividers) which shall
divide the filter into a multitude of [_____] wide compartments. Each
compartment shall be arranged for connection to a separate backwash port.
The divider sheets shall be fabricated of [glass fiber reinforced plastic
binder] [Type 304 stainless steel] [_____] with a finished thickness of
[_____]. The divider sheets shall be without voids and/or air pockets.
Cell sheets shall not twist, curve or bend.
SECTION 11393
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