SECTION IX. PRINCIPLES OF OPERATION
1-48. WATER PUMPING SYSTEM.
Water pressure is supplied to the water pumping system by a Darley PSE,
single stage, engine driven, centrifugal pump. Water flows from the pump
discharge manifold to roof turret, bumper turret, ground sweeps, window
deluge system, two (2) pre-connect discharges; and two (2) driver's side and
passenger's side discharge valves.
The water pumping system can be operated from both cab instrument panel
or pump operators panel. Controls are interlocked to ensure single operator
control. In pump and roll mode, system can only be operated from cab
instrument panel. In structural mode, system can be operated from pump
In pump and roll mode, water is supplied to the pump from the water tank.
Pump must be disengaged when water tank is emptied.
In structural mode, water is supplied to the pump from either the water tank
or alternate source(s). Alternate sources may be fire hydrants, remote
pumping units, or an open reservoir. If water is drawn from tank for
structural fire fighting, water must be continuously supplied through
automatic tank fill valve.
1-49. WATER PUMP ENGINE.
The water pump engine is a Deutz, six cylinder, turbocharged, auxiliary
diesel pump engine. The water pump engine is water-cooled and has 198 HP
to drive the water pump. The water pump engine is installed in the pump
house in a "crossmount" configuration. This allows for water pump
modulation in accordance with NFPA 414 for all vehicle speed ranges, in all
directions of travel, without any loss of pump discharge rates and ranges.
The water pump engine draws fuel from the chassis fuel tank.
Water pump pressure can be increased or decreased by changing water pump
1-50. WINDOW DELUGE SYSTEM.
Operated from cab instrument panel. Nozzles are mounted below windshield
and receive fluid from a 24 VDC electric pump. The window deluge system
draws water from the 1,000 gal (3,785 L) water tank.