Equipment Description (Cont)
Water Pump. A 1,000 GPM Darley PSE single stage pump, engine driven,
centrifugal type. The pump delivers the percentage of rated discharge at
pressure indicated below. Water system controls are labeled with black
letters on a gray background.
100% of rated capacity at 150 psi (1,034 kPa) net pump pressure.
70% of rated capacity at 200 psi (1,379 kPa) net pump pressure.
50% of rated capacity at 250 psi (1,724 kPa) net pump pressure.
Pump body is fine-grained gray iron, bronze fitted. Impeller is a high
strength bronze alloy accurately balanced and splined to pump shaft for
precision fit and durability. A double seal ring design helps to minimize end
thrust. Deep groove radial type oversize ball bearings are used. Bearings are
protected at the openings from road dirt and water with an oil seal and a
Foam System (Class A & B). An "around-the-pump" foam proportioner is
located on the intake side of the pump.
The foam system is plumbed to two foam tanks with a foam valve and check
valve in each foam line.
A multi-metering valve arrangement is provided for discharges controlled
inside the personnel cab. Turrets and ground spray nozzles are preset for 3%
AFFF for Class B foam and 1% for Class A foam.
An adjustable metering valve located on the pump operators pump panel
allows the operator to select the proper setting at any flow within the
operating range for the six discharges. Each discharge will be proportioned
at the same rate.
Controls for the foam system are located on the pump operators panel and
are labeled with red letters on a white background for easy identification.
Controls for eductor, foam supply, and flush, are electric over pneumatic to
allow for an ergonomically designed control panel and simplified operation.
All piping coming in direct contact with the foam agent is immune to the
agent; so deterioration of plumbing is avoided.
This system is designed to operate at no more than 5 psi (34 kPa) on the
suction side of the water pump.
System Capacity. The system has the ability to deliver the following
minimum foam solution flow rates:
500 GPM (1,893 L/min) @ 6%
1,000 GPM (3,785 L/min) @ 3%