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.
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.
