Pierce HUSKY 3 - 3-4.2 Fill through Foam Tank Fill Dome

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OPERATION

3-10 / Husky 3 Foam System

3-4.2 Fill through Foam Tank Fill Dome

NOTE: Locate and close all foam tank and manifold drains. They may be found on and behind both the

driver and passenger side pump panels.

When filling the foam concentrate during a non-fire situation, the following procedure is recommended:

1. The vehicle should be parked on a level surface or with the expansion dome of the tank slightly inclined.

2. If filling from a pressurized source through the expansion dome hatch, the hose should be extended to the

bottom of the tank to minimize frothing of the foam concentrate.

3. If foam concentrate must be added by pouring through the expansion dome hatch, it must be done slowly to

prevent aeration. If aeration occurs inside the tank, stop pouring until the foam concentrate bubbles dissolve.

Take care not to allow dirt or debris to enter the tank. Pour the foam concentrate down the center of the round

tube when filling the tank. This tube goes into the tank and allows the foam concentrate to enter under the

surface of foam currently in the tank to reduce aeration of the foam per NFPA.

Do not mix different types or manufacturers brands of foam concentrate in the foam cells or piping.

Mixing of different foam concentrates (either type or manufacturer) may cause deterioration of the

foam concentrate, improper proportioning and poor performance in a fire situation. Mixing of Class A

and Class B foam concentrates may result in a chemical reaction that can create globules, which can

clog orifices and cause system failure.