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9. PRIME AND DISCHARGE
Relay water supply (when water is supplied from a fire hydrant)
1.
Determine the pump pressure in consideration of the water discharge pressure
(nozzle pressure), hose pressure loss, and height loss.
2.
Foreign materials such as dirt, gravel, iron rust, etc. may go into a fire hydrant.
Before connecting a hose, open a fire hydrant and discharge water in order to
remove foreign materials.
3.
When using water from a fire hydrant, set a mediation metal to the suction port of
the pump. (Between a delivery hose and the pump)
4.
Set the discharge valve handle of the pump to the full open position.
5.
Gradually open the fire hydrant on-off valve. However, check the water pressure
from fire hydrant with suction pressure gauge on the pump and adjust the opening
of fire hydrant on-off valve, if necessary.
・
If the water pressure from a fire hydrant is higher than 0.6MPa,
do not open the fire hydrant on-off valve more.
・
If the water pressure from fire hydrant is higher than the
required discharge pressure, it is not necessary to start the
pump.
6.
If the water pressure from fire hydrant is insufficient, start the engine and adjust
the discharge water pressure to the required level by operating the throttle lever.
Stop increasing discharge pressure if the suction pressure gauge shows 0.1MPa
(15psi) or below. If it does, stop increasing the pressure and keep the throttle lever
as it is.
7.
To end discharge water, turn the throttle lever to the low pressure position firstly,
then stop the engine and close the fire hydrant on-off valve.
・
Be sure not to close the discharge valve and nozzle of any
pumps until all the pumps stopped and the fire hydrant on-off
valve is closed.
8.
Set the discharge valve to the half-open position, and open all the drain valves to
drain the remaining water in the pump as maintenance after operation.
Pump pressure = needed pr height loss + friction loss
CAUTION
CAUTION
