Specifications

Loveland Fire/Rescue
Pumper
Production Specification
SVI #769 Page 106 of 125 June 17, 2010
..\4) Pricing & Change Orders\Production Change Order.pdf
Means shall be provided for pre-selection of measurement units: U.S. Gallons, Imperial Gallons or Liters
Remote Activation
The system can be activated from an external 12 or 24-volt electrical source, such as a pump-in-gear circuit or engine
ignition power which can eliminate one step in the operational sequence.
Flowmeter
A paddlewheel-type flowmeter shall be installed in the process manifold upstream of the foam injection point and shall be
connected to the microcontroller. A stainless steel paddlewheel with jewel bearings and carbide axle shall be utilized for
improved accuracy and long life. The flowmeter shall have a 600 PSI (34 BAR) pressure rating per NFPA requirements.
The flowmeter function on the OIT shall display the water rate of flow in real time as well as the total water used during
and after foam operations.
Foam Pump
A 12 or 24-volt electric motor driven Hydra-Cell positive displacement foam concentrate pump, rated at 3 gpm (11.3 lpm)
at 150 psi (10 BAR) and with operating pressures up to 450 psi (32 BAR), shall be installed in a suitable, serviceable
location. The system shall draw a maximum electrical load of 40 amps @ 12 VDC or 21 amps @ 24 VDC. A pump motor
electronic driver, located inside the controller housing shall receive signals from the microcontroller and power the 1/2 hp
(.4 Kw) electric motor in a variable speed duty cycle to ensure that the correct amount of foam concentrate as set by the
pump operator is injected into the water stream. The highly efficient Hydra-Cell Industrial diaphragm pump is a
hydraulically balanced diaphragm pump offering many inherent advantages over other types of pumps for pumping foam
concentrates.
The Hydra-Cell pump converts rotating motion into linear motion by means of a drive shaft assembly, sequentially moving
hydraulic pistons which are filled with oil in a rearward and forward stroke. The oil held in the piston balances the back
side of the diaphragm and causes them to flex forward and back providing the pumping action.
To provide long lasting, trouble-free diaphragm life, the Hydra-Cell hydraulically balances the diaphragm over the pump’s
entire pressure range, even at peak pump pressures. Each diaphragm has its own pumping chamber with its own suction
and discharge valve assembly, so as each diaphragm strokes back, fluid enters the pump through the inlet and on the
forward stroke the diaphragm forces the fluid through the discharge valve assembly into the outlet manifold and out of the
pump. All of the diaphragms in the pump are equally spaced from one another while overlapping pumping strokes result in
low discharge pulsation. Pump output flow shall be proportional to pump shaft speed (RPM) regardless of pressure, thus
a linear flow relationship shall exist with increasing or decreasing pump RPM.
The pump shall be self priming and capable of drawing foam concentrate from reservoirs or containers which are located
below the pump inlet. Lift time and distance will depend on product viscosity. Overboard foam sources may be utilized
when the apparatus is equipped with the proper piping, connections and selector valve(s).
For reduced maintenance, the pump shall utilize no packing, cups or seals. All metal pump components which may come
in contact with foam concentrate shall be brass or stainless steel, making the pump resistant to chemical and corrosive
attack. It shall be capable of handling suspended abrasives without sustaining any damage. The pump shall also be
capable of running dry for extended periods without sustaining damage.
Control Cables and Connectors
The cables for interconnection of the control unit, OIT, conductivity sensors and flowmeter shall be electrically shielded to
prevent radio frequency or electro-mechanical interference.
Low Tank Level Switch
A low tank level float switch shall be installed in each foam concentrate tank and connected to the control unit to alert the
operator to low foam supply conditions