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Air System - TM-5-4210-220-12_29
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Firefighting System  - Continued
TM 5-4210-220-12 1-9 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - Continued n. Firefighting System. (1) 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. (2) 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 1-15

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