Pierce HUSKY 3 - 2-2.3 A MANIFOLD and 2-2.3 B I N - LINEW; 2-2.2 H FOAMI; 2-2.3 Water Supply

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GENERAL

2-2.2h Foam Injection Check Valve

Figure 2-13: Foam Injection Check Valve

1354, 1355

The Foam Injection Check Valve located in the foam discharge line prevents water from flowing backwards through

the foam system and contaminating the foam supply.

2-2.3 Water Supply System

The water supply system supplies water to the foam injection manifold for foam to be added and distributed to the

foam/water discharges. This system consists of an in-line water check valve, water flowmeter and flowmeter

installation tee. The size of the check valve and the flowmeter installation tee are dependent on the water flow rates

and the number of foam/water discharges in the system.

2-2.3a Manifold and Master Drains

Figure 2-14: Manifold & Master Drains

1325, 1067

The manifold drains are used to bleed off pressure/water anytime the water pump has been pressurized (after the

water pump is shut off). If a dry water pump condition is desired, leave manifold drains open until the fire scene is

reached.

The master pump drain will empty both the discharge and inlet manifolds of water when opened. The water pump

drain should be pulled (opened) daily.

Foam Injection

Check Valve

Foam Injection

Fitting