6 Commissioning/Start-up/Shutdown
58 of 98
UPA / UPA S
3400.86/17-EN
The submergence
X
of the pump sets must be ≥ 0.5 m for the following examples of
vertical and horizontal installation.
A higher submergence may be required by the NPSH value specified in the order
documentation or the value indicated in the following diagram.
0,0
0,5
1,0
1,5
2,0
X
m
Q l/s
0
100
200
50
150
0
100
200
Q m
3
/h
600
300
500
800
700
Fig. 24:
Minimum submergence depending on the flow rate
The values in the above mentioned diagram apply to submersible borehole pumps up
to size UPA 350.
For larger pump sets refer to the value X in the order documentation or the data
sheet. Contact the manufacturer, if required.
NOTE
The fluid level in the well is usually measured with a water level contact meter (well
dipper).
Vertical
installation
Measurement for vertical installation:
upper edge of the pump to lowest (dynamic) fluid level
X = H
e
- H
t
D
T
H
e
H
h
H
t
H
g
e
o
X
Fig. 25:
Minimum submergence for vertical installation
T
Well depth
H
h
Static fluid level
D
Well diameter
H
t
Dynamic fluid level
H
e
Installation depth of the pump set
H
geo
Height of switchgear above the
static water level in the well
X
Minimum submergence
Horizontal
installation
Measurement for horizontal installation:
upper edge of the suction strainer to lowest (dynamic) fluid level
