Operating Conditions - Grundfos DWK Installation And Operating Instructions Manual

3. Operating conditions

The DWK pump range is suitable for two operating
modes:
• continuous, submerged operation, S1, with
minimum liquid level above the pump
• intermittent operation, S3, with the pump partly
submerged. See fig. 1.
Fig. 1 Liquid level
pH value
DWK pumps in permanent installations can cope
with pH values ranging from 4 to 10.
Liquid temperature
0 to 40 °C.
Density of pumped liquid
3
Maximum 1000 kg/m .
In the case of higher values, contact Grundfos.
Installation depth
Maximum 25 metres below liquid level.
Operating pattern
DWK.O: Maximum 30 starts per hour.
DWK.E: Maximum 18 starts per hour.
6
S1
S3
Fig. 2
Pos.
1
2
3
4
5
6
7
8
9
DWK pump
Description
Lifting bracket
Nameplate
Motor
Oil plug
Outlet flange/hose connection
Cable entry
Top cover
Inlet strainer
Pump housing