© 2022 Pierce Manufacturing Inc. All Rights Reserved. Husky 3 Foam System / 2-7
GENERAL
2-2.2 Foam Supply System
The Foam Supply System stores, pumps and distributes the foam concentrate to the foam/water discharges by use
of a foam concentrate tank, foam tank shut-off valve, auxiliary foam inlet, in-line foam strainer, foam pump, check
valve and foam injection manifold.
2-2.2a Foam Concentrate Tank
The Foam Concentrate Tank is designed to provide on-board storage of foam concentrate. Design features shall
include: construction compatible with foam concentrates, foam tank drain valve, expansion dome with locking fill
hatch and pressure/vacuum vent. The expansion dome allows for changes in foam concentrate volume due to
variations in temperature. Foam concentrate level shall be maintained at the one-third full mark in the expansion
dome at a minimum to reduce the air to foam concentrate interface. The pressure vacuum vent automatically
balances internal foam tank pressure under both suction and filling operations.
2-2.2b Foam Supply Valve
Figure 2-7: Foam Supply Valve (Tank/Draft Valve)
1352
A manual valve is used for the Foam Supply Valve. The supply valve is located to eliminate air pockets in the foam
tank supply hose. The Tank/Draft Valve selects between the on-board foam concentrate tank and an external foam
supply (i.e. foam pail) by means of the Foam Inlet.
from Foam Tank
to Foam Pump Inlet
Wye Strainer
from Selector Valve
(Inject / Fil)l
Tank Fill Check Valve
Selector Valve Handle
Down = Foam Tank
Up = External Foam Pick-up
External Foam Inlet
(3/4” garden hose)
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