Initial Start-Up; Filling Pump With Water - Lorentz PS Série Manuel D'installation Et De Fonctionnement

8.4.5 Initial Start-up

CAUTION – Never start the pump if it is
not filled with water and has not been
vented. The pump and suction pipe must
be fully filled with clean water.

8.4.5.1 Filling Pump with Water

The pump and the whole suction pipe must be fully filled
with clean water.
If the water level is higher than the pump inlet:
1. Close the gate valve in the outlet pipe and loosen the
air vent screw.
2. Open the gate valve in the suction pipe slowly.
3. Tighten the air vent screw when water streams out
continuously.
If the water level is below the pump inlet:
Suction pipeline and pump must be filled with water.
1. Close the gate valve in the outlet pipe and open the
gate valve in the suction pipeline.
2. Loosen the air vent screw and fill the water into the
pump.
3. Fasten the air vent screw after the pump and the
suction pipeline are completely filled with water.
In open systems where the liquid surface is below the level
of the pump the water injection hole can be used.
CAUTION – For larger diameter pipes the
suction pipe should be primed separately
from the pump. Installing a filler pipe
simplifies this. The pump must be fully
primed after the suction pipe is full.
CAUTION – A nonreturn valve must be
installed at the start of the inlet pipeline.
Pump Installation
WARNING – Do not start the pump until it
has been filled completely with water.
WARNING – Make sure that the installed
shutoff valves in the suction and pres-
sure lines are completely open during
operation, the pump must never run with
shutoff valves closed!
Figure 20: Vent and drain holes
47
Air vent hole
Water drain hole