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Do not use this pump/electric pump unit to handle
flammable and/or explosive liquids
Do not use this pump to handle liquids
WARNING
containing
substances.
For special requirements, please contact the Sales and Service
Department.
Depending on the pump model and on the temperature of the
pumped liquid, the maximum operating pressure is shown in the
following chart.
Liquid Temperature
- for standard version (EPDM gaskets):
- for special version (FPM gaskets):
- for special version (PTFE gaskets):
- for household and similar purposes (EN 60335-2-41):
[bar]
50
45
40
35
30
25
20
15
10
5
0
-40
-30
-20
-10
0
+10
+20
Stainless Steel Flanges
SV1 1 25_M 0008_A _sc
3.1.3 Suction
In theory, a pump could suck water from a source located 10.33
meters lower than the pump's own installation level, but this does
not happen because the pump offers its own intrinsic flow
resistance, moreover the suction capacity is reduced as a result of
flow resistance in the piping, height difference, liquid temperature
and elevation above sea level.
A wrong choice in the altimetric placement of the pump could
lead to cavitation.
With reference to Fig. C and given Z as the maximum height at
which the pump can be installed, with reference to the level of the
liquid source the following can be stated:
Z=p
• 10,2 – NPSH – H
- H
b
f
p
Barometric pressure in bar, in closed systems it shows
b
system pressure
NPSH
Value in [m] of the pump intrinsic flow resistance
H
Total losses in [m] caused by passage of liquid
f
through parts on the inlet side of the pump
0.50
Recommended safety margin in [m]
H
Steam pressure in [m] through the liquid Temperature
v
T [°C] (for additional information Fig.C)
With the meanings given in the above table it can be stated that:
If Z≥0 the pump can work with a maximum suction height equal
to Z.
If Z<0 the pump must be provided with an inlet pressure equal to
–Z.
For additional information on SV-series performances Fig.D
Do not use the pump if cavitation occurs, as
WARNING
its internal components could be damaged.
.
.
abrasive,
solid
or
Minimum Maximum
- 30°C
+ 120 °C
- 10 °C + 120 °C
0 °C
+ 120 °C
PN40
PN25
PN16
+30
+40
+50
+60
+70
+80
+90
+100
+110
Cast Iron Flanges
-0,5
v
WARNING
prevent cavitation.
fibrous
WARNING
the maximum pressure delivered by the pump does not exceed the
maximum working pressure allowed (nominal pressure PN) for the
pump ( Fig.E).
p
≤ PN - p
1max
With the following meaning of the symbols:
p
max
p
1max
PN
If a motor with an axially locked shaft (Lowara standard) is used,
+ 90 °C
ensure that the above formula is fulfilled, if not please contact the
Sales and Service Department.
3.1.4 Minimum nominal flow rate
WARNING
To determine minimum nominal flow rate Fig.G
3.1.5 Number of starts per hour
For electric pump units coupled to motors supplied by Lowara, the
maximum number of work cycles (starts and stops) in one hour is
as follows:
+120
+130
[°C]
kW
0.25
n
kW
4
n
WARNING
relevant instructions to find out the maximum number of work
cycles allowed.
3.1.6 Installation Site
WARNING
temperatures. Provide adequate ventilation for motor cooling
purposes.
Ambient temperature +0°C to +40°C.
[m]
Relative ambient humidity must not exceed 50% at +40°C.
WARNING
1000 meters above sea level, the motor must be derated (the
power it delivers must be decreased) to guarantee its proper
cooling. The motor may have to be replaced with a more powerful
one. Please check Fig.H and, when in doubt, please contact the
Sales and Service Department.
If the relative air humidity conditions are high, please contact the
Sales and Service Department.
Do not use the pump/electric pump unit in environments
that may contain flammable/explosive or chemically
aggressive gases or powders.
Provide adequate lighting and clearance around the pump/electric
pump unit. Make sure it is easily accessible for installation and
maintenance operations. Make sure that any fluid leaks or other
events of this nature will not lead to flooding of the installation
area and consequent submersion of the pump/electric pump unit.
If hot water is pumped, guarantee an
appropriate condition on the suction side to
Make sure that the sum of the pressure on the
suction side (water mains, gravity tank) and
max
Maximum pressure delivered by the pump
Maximum inlet pressure
Maximum operating pressure
Do not run the pump with the on-off valve shut
on the delivery side for longer than a few seconds.
0.37
0.55
0.75
1.1
60
5.5
7.5
11
15
18.5
40
30
24
If a different motor is used instead of the
standard one supplied by Lowara, check the
Protect the pump/electric pump unit from the
weather
(rain,
For temperatures above +40°C and for
installation sites located at elevations of over
en
1.5
2.2
3
22
30
37
45
55
16
8
4
wind,...)
and
freezing
17
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