2.17
PUMPED BALANCED PRESSURE PROPORTIONING SYSTEM
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NOTE: Delete paragraph DIAPHRAGM TANK BALANCED
PRESSURE PROPORTIONING SYSTEM if the following
paragraphs are used.
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2.17.1
AFFF Concentrate Storage Tank
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NOTE: Provide seismic details, if a Government
designer (either Corps office or A/E) is the
Engineer of Record, and show on the drawings.
Remove the bracketed phrase if seismic details are
not provided. Sections 13080 and 15070A properly
editied, must be included in the contract docments.
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Tank shall be designed for storage of AFFF concentrate at atmospheric
pressure and shall be vertical cylindrical, high density cross-linked
polyethylene construction. Individual tank capacity shall be a minimum of
[_____] L gallons. Tank shall be translucent and equipped with level gauge
strip for approximating quantity of tank contents. Tank shall be equipped
with the following: inspection hatch; valved drain/fill connection; foam
concentrate pump suction and return connections (with flex connectors);
pressure/vacuum vent; low liquid level float switch; seismic tie downs and
other accessories required for proper operationshall be in accordance with
Sections 13080 SEISMIC PROTECTION FOR MISCELLANEOUS EQUIPMENT and 15070A
SEISMIC PROTECTION FOR MECHANICAL EQUIPMENT [as shown on the drawings].
Openings and tank connections shall be installed at the factory, no holes
shall be made in the tank shell in the field. Tank shall include necessary
supports for free standing installation.
2.17.2
AFFF Concentrate Pump
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NOTE: Pump capacity must be sufficient to supply
AFFF concentrate under design conditions with
operation of sprinklers and nozzles as provided.
Pump pressure should be approximately 206 kPa (30
psi) above maximum system water pressure.
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Pump shall be a positive displacement rotary gear or vane type operating at
a speed not greater than 1800 rpm. Pump capacity shall be [_____] L/second
gpm. Pump discharge pressure shall be a minimum of [_____] kPa psi.
Metallic pump components in contact with AFFF concentrate shall be of
bronze or stainless steel construction. Each pump shall be furnished with
suction strainer, relief valve, and suction and discharge gauges. Pump
shall be mounted on a carbon steel base and shall have guards over
couplings. Pump shall be direct-connected to electric motor with
drip-proof enclosure. Motor size shall be minimum [_____] kW hp.
2.17.3
AFFF
Pump Controller
Controller shall be the automatic type and UL listed or FM approved for
fire pump service and shall be arranged for automatic start and stop, and
manual push-button stop of the AFFF pump it controls. Controller shall be
SECTION 13955A
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