9. Technical data
9.1 Operating conditions
9.1.1 Ambient temperature and altitude
The ambient temperature and the installation altitude
are important factors for the motor life as they affect
the life of the bearings and the insulation system.
Ambient temperature must not exceed +40 °C.
If the ambient temperature exceeds +40 °C or the
motor is installed more than 1000 m above sea level,
the motor must not be fully loaded due to the low
density and consequently low cooling effect of the air.
In such cases, it may be necessary to use a motor
with a higher output.
20 25 30 35 40 45 50 55 60 65 70 75 80
50
60
70
80
90
100
[%]
P1
t [°C]
1000 2250 3500 m
TM002189
Relationship between motor output (P
2
) and
ambient temperature
Example
The upper figure shows that the load of the motor
must be reduced to 88 % when installed 3500 m
above sea level. At an ambient temperature of 70 °C,
the motor load must be reduced to 78 % of the rated
output.
In cases where both the maximum temperature and
the maximum altitude are exceeded, the derating
factors must be multiplied (0.88 x 0.78 = 0.69).
9.1.2
Liquid temperature
The maximum liquid temperature marked on the
pump nameplate depends on the mechanical shaft
seal used:
Temperature range for NBR:
0-100 °C
Temperature range for FKM: 15-100 °C
9.1.3 Pressure in the pump
TM082533
Pressure in the LS pump
Pos. Description
1
Pressure p stated on the pump
(pressure above atmospheric pressure)
2 Pump pressure
3 Inlet pressure
Maximum outlet pressure
The maximum outlet pressure is the
pressure (p) stated on the pump
nameplate.
Minimum inlet pressure
The minimum inlet pressure must correspond to the
NPSH curve for the pump + a safety margin of
minimum 0.5 metres head.
NPSH appears from the data booklet and Grundfos
Product Centre.
Maximum inlet pressure
The inlet pressure + pump pressure must be lower
than the maximum pressure (p) of the pump. This is
stated on the nameplate. See section Nameplate.
Related information
5.3.1 Nameplate
43
English (GB)
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