1-9 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - Continued
The firefighting system consists of a foam and water tank, a fire pump, a water pressure regulating system,
a foam proportioning system, and a control system including pressure gages, (see fig. 1-14). The water and foam
discharge system includes the roof and bumper turrets and handline discharge ports.
The water tank is mounted on the truck frame. The tank is attached by rubber-and-spring-type flexible
mounts to relieve twisting forces from frame flexing during travel in rough terrain. The foam tank is bolted directly to the
water tank. The water tank is provided with baffles to reduce surging. These baffles have large cut-outs to ensure
unrestricted water passage and service access. Both tanks are provided with overflow lines which provide unrestricted
tank ventilation. Filling and service access is provided through fill openings in the top of each tank. These openings are
equipped with tight fitting covers which are held closed by clamp type locks. The water tank is equipped with an
automatic tank fill valve to enable filling by another pumping unit. This valve is located in the tank rear wall. Another
inlet near the top of the tank is used for refilling via the fire pump. A sump at the bottom of each tank provides
connection to the water and foam piping systems.
Figure 1-14. Firefighting System Components