Temperature Calculation; Temperature Class - Grundfos CR Serie Instrucciones De Instalación Y Funcionamiento

8.3 Temperature calculation

The illustration below shows the maximum surface
temperature of the pump as a result of the maximum
liquid temperature and temperature rise in the shaft
seal.
Fig. 4 Maximum surface temperature
Pos. Figure legend
Maximum surface temperature of the
1
pump
Temperature rise in the shaft seal.
2 Calculated by Grundfos. See section
8.3.2 Shaft seal
3 Maximum liquid temperature

8.3.1 Temperature class

Temperature class
T1
T2
T3
T4
T5
T6
The maximum surface temperature for dust is stated
on the nameplate.
14
1
2
3
temperature.
Maximum surface
temperature
[°C]
450
300
200
135
100
85
8.3.2 Shaft seal temperature
In order to calculate the pump surface temperature
and temperature class, the below tables show the
temperature rise in the shaft seal for different shaft
diameters, different pressure values and various
media classes.
Shaft seal: HQQx/HUUx/HQUx and
AUUx/AQQx/DQQx
Rpm: 2900/3500
Shaft
diameter 1
[mm]
Shaft seal temperature rise [°C]
12
16
22 22
28
36
Shaft seal: HQBx/HUBx
Rpm: 2900/3500
Shaft
diameter 1
[mm]
Shaft seal temperature rise [°C]
12
16
22 18
28
36
Pressure [MPa]
2.5 4
24 26
Pressure [MPa]
2.5 4
20 22