En
gl
is
h (
G
B)
12
5. Starting-up the product
Check the oil level in the gearbox before starting up
the pump. The oil must fill up between 50 and 75 %
of the gearbox.
If required, fill oil into the gearbox through the oil
filling hole (pos. 2 in fig.
). For oil quality and
quantity, see section
If the pump has been in stock for a period before
startup, see section
.
Fig. 16
Oil check and oil filling
Checks before startup
1. Check that the impeller is rotating in the correct
direction. See section
.
2. Make sure that the pump is completely
submerged in the liquid.
3. Make sure that there are no solid objects in the
tank.
6. Product introduction
Grundfos recirculation pumps, type SRG, are
designed for transfer of liquids of low to medium
viscosity from one tank to another.
Fig. 17
SRG pump
6.1 Applications
Grundfos SRG recirculation pumps are used for the
pumping of return sludge in sewage treatment plants
and for other pump applications involving a high flow
rate and low head. The pumps are designed for
continuous operation (S1).
In order not to overload the pumps and expose them
to corrosion, the following limitations must be
observed.
Warning
When loosening the oil level screw, note
that pressure may have built up in the
chamber.
Do not remove the screw until the pressure
has been fully relieved.
T
M
02
94
79
27
04
Caution
The pump must always be submerged
during operation.
Warning
Make sure that no persons can fall into the
tank.
1
3
2
T
M
03
03
74
33
08
Pos.
Description
4
Pump rack
7
Motor
8
Gearbox
10
Impeller
22
Hydraulic inlet
Liquid temperature
5-40 °C
pH value
4-10
Maximum dry solids content
1.5 %
Maximum dynamic viscosity
500 mPas
Maximum density
1060 kg/m
3
Chloride content
≤
200 mg/l
(stainless steel
1.4301)
22
4
7
10
8
