42
PRIME AND DISCHARGE
Performing relayed water supply (When having water from fire
hydrant)
1. Decide the pump pressure in consideration of the water discharge
pressure (nozzle pressure),height loss and hose pressure loss(friction
loss).
2. Foreign materials such as dirt, gravel, iron rust, etc. may in a fire hydrant.
Before connecting a hose, open a fire hydrant to discharge water in
order to remove foreign materials.
3.
When pumping up water from a fire hydrant, use a mediation metal and
use a delivery hose(for high pressure) to connect the suction port instead
of a 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.
However, check the water pressure from the fire hydrant with suction
pressure gauge of the pump, and adjust the opening of fire hydrant, if
necessary.
･
If the water pressure from a fire hydrant is higher than
0.6MPa (87psi), do not continue to open the fire hydrant
on-off valve.
*
･
If the water pressure from a fire hydrant is higher than the
required discharge pressure, it is not necessary to run the
pump.
･
If the water pressure from fire hydrant has not reached the
required pressure, start to run the engine.
6. If the water pressure from fire hydrant is insufficient, start the engine and
adjust the pressure to the required level by operating the throttle dial.
Stop increasing discharge pressure if the suction pressure gauge shows
0.1MPa (15psi) or below. If it does, stop increasing the pressure and keep
(Operate) the throttle dial not to make the suction water side pressure
below 0.1MPa (15psi).
7. At the end of discharging water, turn the throttle dial to the low pressure
position first, 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 before all the pumps stop and the fire hydrant on-
off valve is closed
.
8. Open all the drain valves to drain the remaining water as maintenance
after the operation. In the case of ball cock type water discharge valve,
open the drain cock which is at the down side of the valve, turn the valve
handle to the half-open position to drain all the water from the valve.
9
Pump pressure = needed pr height loss+ friction loss
CAUTION
CAUTION
１
１
２
２
３
３
４
４
５
５
６
６
７
７
８
８
９
９
10
10
11
11
12
12
13
14
15
16
17
18
13
14
15
16
17
18
19
19
