Specifications

Proposal Number PSDF #P09-0004
FOAM CONCENTRATE STRAINERS
Field serviceable foam concentrate strainers shall be provided in the foam concentrate suction line. When
the strainer shall not be subject to flushing water pressure a plastic bodied in-line strainer shall be used. The
strainer body shall be constructed of plastic with a stainless steel mesh screen and shall be compatible with
Class A foam concentrates. A shutoff valve shall be provided to enable isolation of the strainer for service.
The strainer shall be mounted in the pump compartment. The strainer shall be a low pressure device and
shall not be subject to flush water pressure.
Where strainers are subject to flush water pressure, panel mounted field serviceable foam concentrate
strainers rated at 500 PSIG (34 BAR) minimum shall be installed on the pump panel. The strainer body shall
be constructed of brass with a chrome cap and an easily removable stainless steel mesh screen for field
servicing. A 1-½ inch strainer with ¾ inch NPT connection ports shall be used for Class A foam concentrate.
INJECTOR FITTING AND CHECK VALVES
To prevent contamination of the foam concentrate supply, foam concentrate shall be injected into the water
pump discharge stream through an integral check valve/injector fitting. The check valve/injector fitting shall
be of one piece construction of brass and stainless steel. To prevent contamination of the water pump and
apparatus booster tank wafer type check valves shall be installed in the water pump discharge piping prior to
the foam injection point.
FLOWMETER
A paddlewheel type flow meter shall monitor water flow in foam capable discharges. The flow meter body
shall be constructed of bronze and the sensor assembly shall be locked into the tee with a pin and screw on
cap. The flow meter shall have a 500 PSIG (34 BAR) pressure rating per NFPA requirements.
One (1) flow meter is required for proper operation of the foam proportioning system. Power for the flow
meter sensor shall be provided through the electrically shielded cable set from the control unit. Flow meters
having NPT threaded and Victaulic connections shall be used in the water discharge piping.
The flow meter selected shall be sized to adequately monitor the minimum and maximum flow expected in
the foam capable discharges.
CONTROL CABLES
The cables for connection of the control unit, distribution box, flow meter sensor, flow meter display units,
pressure transducers and feedback sensor shall be 100% electrically shielded molded male by female
cordsets. The cordsets shall have the ability to connect together and total length shall not exceed 40 feet (12
meters). The connections shall be keyed to prevent mis-connection and improper system operation.
Shielding shall be provided by an aluminized mylar shield within the PVC outer jacket. A drain wire shall
be tied to one of the pins on each end of the cable. No externally attached ferrite beads shall be installed for
the purpose of electrical shielding. Coupling nuts on the cordset ends shall be constructed of nickel coated
brass. When properly connected the connections shall be sealed to NEMA 4X or equal.
FOAM SUPPLY
The foam proportioning system shall be supplied from a separate apparatus mounted foam concentrate
storage tank. The tank shall be constructed of materials compatible with foam concentrates being used in the
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