Specifications

Proposal Number PSDF #P09-0004
SYSTEM REQUIREMENTS
The complete foam proportioning system shall include the following:
1) Foam Pump
2) Control System
3) Foam Concentrate Strainer
4) Integral Check Valve/Injector Fitting.
5) Flow meter
6) Control Cables
7) Low Tank Level Switch
8) Water Discharge Check Valves
FOAM PUMP
The foam proportioning system shall be compatible with Class A foam concentrates. The foam
proportioning system shall be capable of delivering the rated foam concentrate flow with the above
mentioned foam concentrate type. The foam proportioning system shall be based on an electric motor
driven, rotary gear foam concentrate pump, rated at 2.1GPM (7.9 LPM) foam concentrate flow rate with
maximum operating pressure of 400 PSIG (28 bar).
The foam pump/motor assembly shall be permanently attached to an apparatus mountable base plate. A
foam concentrate flow meter shall be integral to the foam concentrate pump. The foam concentrate flow
meter shall provide a signal to the electronic control unit to make sure the proper amount of foam concentrate
is injected into the discharge stream. The entire base plate mounted assembly shall have electrical
components sealed to NEMA 4X or equal for mounting in the apparatus pump compartment or any suitable
location on the apparatus.
EXTERNAL FOAM TANK
A thirty (30) gallon polypropylene foam concentrate tank shall be furnished as an external component of the
booster tank. The foam tank shall have an anti-foaming fill stack and removable screen located in an
accessible area. The foam tank fill tower shall be equipped with a latch, pressure/vacuum vent and have a
sealed airtight cover.
The foam tank shall be plumbed to the on board "Class A" foam system. A drain valve shall be provided at
the lowest point of the foam tank. The foam tank shall drain shall directly to the surface below the apparatus
without contacting other body or chassis components. The following labels shall be attached to the foam
tank:
"CLASS A FOAM TANK FILL"
"WARNING: DO NOT MIX BRANDS AND TYPES OF FOAM"
LOW TANK LEVEL SWITCH
A low tank level switch shall be installed in the foam concentrate tank. The low tank level sensor shall be
connected to the foam proportioning system to provide protection against dry running of the foam pump.
The low tank level sensor shall be mounted on the side of the foam concentrate tank. The low tank level
sensor and electrical connections shall be sealed to prevent infusion of foam concentrate into the wiring and
possible short circuit of the tank level sensor.
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