Pierce Pumper, Operation & Maintenance Manual, Page: 39 / 66

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Pierce Pumper / 3-23
OPERATION
3-8.3 Charging Line
Discharge Water - Charging Line
Opening valves rapidly can cause pressure spikes.
Open and close valves slowly.
Pressure spikes can cause hoses to kick with great force, causing injury.
Opening valves rapidly can cause water hammer.
Water hammer can damage the pump and other water system components.
1. With pump engaged, water fed to pump, and hose connected, SLOWLY open discharge valve.
— Open and close discharge valves slowly to avoid a pressure spike in other hoses.
— OPEN discharge valve one-half OPEN until attack line is filled with water and air is escaped from hose.
— Observe personnel on the end of the attack line while the hose is filling.
2. Adjust discharge valve.
AFTER air is released from the line and water is flowing steadily from the attack nozzle, adjust the discharge
valves.
3. Observe tank level indicator.
Water level in the tank drops as water flows to the attach lines. Watch the tank level indicator and plan ahead
to add external water before emptying the tank.
Learn how to open and close discharge valves using the controls on your pump panel. See
“Discharge and
Drain/Bleeder Valves”
on
page 3-21
.
TYPICAL TANK
LEVEL INDICATORS
POM0001, 0022