Technical Data; Ambient Temperature; Maximum Permissible Operating Pressure And Liquid Temperature For The Shaft Seal - Grundfos CRK Guía De Instalación Y Funcionamiento

6. Technical data

Pump type
Minimum liquid temperature [°C]
Maximum liquid temperature [°C]
Maximum operating pressure [bar]
Enclosure class
* Applies to pump version F.

6.1 Ambient temperature

0.06 - 0.18 Siemens
0.25 - 0.55 MG
0.75 MG
1.1 - 22 MG
30-45 Siemens
If the ambient temperature exceeds the above
temperature values or the pump is installed at an
altitude exceeding the above altitude values, the
motor must not be fully loaded due to the risk of
overheating. Overheating may result from excessive
ambient temperatures or the low density and
consequently low cooling effect of the air.
12
CRK MTR
-10 -10
+90
+90
(120*)
25 25
IP55 IP55
- +40 1000 1
- +40 1000 1
IE2 +60 3500 2
IE2 +60 3500 2
IE2 +55 2750 3
In such cases, it may be necessary to use a motor
with a higher rated output.
P2
[%]
100
90
80
70
60
50
20 25 30 35 40 45 50 55 60 65 70 75 80
1000
Fig. 3 Relationship between motor output (P2)
and ambient temperature/altitude
Example: A pump with a 1.1 kW IE2 MG motor: If
this pump is installed 4750 m above sea level, the
motor must not be loaded more than 88 % of rated
output. At an ambient temperature of 75 °C, the
motor must not be loaded more that 78 % of rated
output. If the pump is installed 4750 m above sea
level at an ambient temperature of 75 °C, the motor
must not be loaded more than 88 % × 78 % = 68.6 %
of rated output.
6.2 Maximum permissible operating
pressure and liquid temperature for the
shaft seal
p [bar]
35
30
25
20
15
HUUE / HUUV
10
5
0
-20 -10 0 10 20 30 40 50 60 70 80 90 100 110
Fig. 4 MTR 1s to 64
3
2
1
t [°C]
2250 3500 4750 m
t [°C]