35
PRIME AND DISCHARGE
Performing relayed water supply. (In the case of sucking water
from a fire hydrant.)
1.
Determine the pump pressure in consideration of the water discharge
pressure (nozzle pressure), hose pressure (friction) loss, and height loss.
2.
Foreign materials such as dirt, gravel, iron rust, etc. may have intruded
into a fire hydrant. Before connecting a hose, open a fire hydrant to
discharge water in order to remove foreign materials.
3.
When sucking water from a fire hydrant, use a mediation metal to connect
a delivery hose to the suction port without using the suction hose in
principle.
4. Set the discharge valve handle of the pump to the full open position.
5. Gradually open the fire hydrant on-off valve for the full open position.
However, check the water pressure from a fire hydrant with suction
pressure gauge of the pump and adjust the opening of fire hydrant, if
necessary.
･
In the case of water pressure from fire hydrant is higher
than 6 bar, do not continue to open the fire hydrant on-
off valve.
*
In the case of water pressure from a fire hydrant is higher than the
required discharge pressure, it is not necessary to start the pump. If
the water pressure from the fire hydrant has not reached the
required pump pressure, start the engine.
6.
If the water pressure from a fire hydrant is insufficient, start the engine
and adjust the pressure to the required level by operating the throttle dial.
Stop increasing discharge pressure of the pump if the suction pressure
gauge shows 1bar or below
. In this case,
stop increasing the pressure
and keep the throttle dial as it is.
7.
To end discharging water, turn the throttle dial to the low pressure firstly,
then stop the engine, and close the fire hydrant on-off valve.
･
Be sure not to close the discharge valves and nozzle(s)
of pumps until all the pumps stop and the fire hydrant
on-off valve is closed.
8. Open all the drain valves to drain all the remaining water as maintenance
after operation.
9
Pump pressure = needed pr friction loss + height loss
CAUTION
CAUTION
