Starting-Up The Product; Product Introduction; Applications - Grundfos SRG 60 Hz Installation And Operating Instructions Manual

6. 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.
CAUTION
Pressurized system
Minor or moderate personal injury
- As pressure may have built up in the oil chamber,
do not remove the oil level bolt until the pressure
has been fully relieved.
If required, fill oil into the gearbox through the oil filling hole (2 in
fig. 14). For oil quality and quantity, see section
If the pump has been in stock for a period before start-up, see
section 8.2 Service chart.
Fig. 14 Oil check and oil filling
Checks before start-up
1. Check that the impeller is rotating in the correct direction. See
section 5.4.3 Direction of rotation.
2. Make sure that the pump is completely submerged in the
liquid.
The pump must always be submerged during
operation.
3. Make sure that there are no solid objects in the tank.
Make sure that no persons can fall into the tank.
12
8.3 Oil.
2
1 3

7. Product introduction

Grundfos recirculation pumps, type SRG, are designed for
transfer of liquids of low to medium viscosity from one tank to
another.
22 4 7
8
Fig. 15 SRG pump
Pos. Description
4 Pump rack
7 Motor
8 Gearbox
10 Impeller
22 Hydraulic inlet

7.1 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.
Liquid temperature
pH value
Maximum dry solids content
Maximum dynamic viscosity
Maximum density
Chloride content
10
41 to 104 °F (5 to 40 °C)
4-10
1.5 %
500 cSt (mPas)
3 3
66.2 lb/ft (1060 kg/m )
≤ 200 ppm (mg/l)
(stainless steel 304 (1.4301))