Liquid Temperatures/Cooling - Grundfos MS Montage- Und Betriebsanleitung

4.3 Liquid temperatures/cooling

The maximum liquid temperature and the minimum
flow velocity past the motor appear from the
following table.
Grundfos recommends installing the motor above the
well screen in order to achieve proper motor cooling
via liquid passing the motor.
If the stated flow velocity cannot be
Note
achieved in the borehole, a flow sleeve
must be installed.
If there is a risk of sediment build-up, such as sand,
around the motor, a flow sleeve should be used in
order to ensure proper cooling of the motor.
Motor
MS 402
MS 4000 (T40)
MS 6000 (T40)
MS 4000I (T60)*
MS 6000 (T60)*
MS 6000 (T60)**
PVC
windings
MMS6
PE/PA
windings
PVC
windings
MMS 8000
to 12000
PE/PA
windings
* At an ambient pressure of minimum 1 bar (0.1 MPa).
** At an ambient pressure of minimum 2 bar (0.2 MPa).
For 37 kW MMS6 (only PVC windings),
110 kW MMS 8000 and 170 kW
MMS 10000, the maximum liquid
temperature is 5 °C lower than the
Note
values stated in the above table.
For 190 kW MMS 10000, 220-250 kW
MMS 12000/50 Hz and MMS 12000/
60 Hz, the temperature is 10 °C lower.
Flow past the
motor
[m/s]
0.15
1.00
Flow sleeve recommended
0.15
Flow sleeve recommended
0.15
0.50
0.15
0.50
0.15
0.50
0.15
0.50
Installation
Vertical
40 °C
(~ 105 °F)
60 °C
(~ 140 °F)
Flow sleeve recommended
60 °C
(~ 140 °F)
Flow sleeve recommended
25 °C
(~ 86 °F)
30 °C
(~ 95 °F)
45 °C
(~ 113 °F)
50 °C
(~ 122 °F)
25 °C
(~ 77 °F)
30 °C
(~ 86 °F)
40 °C
(~ 104 °F)
45 °C
(~ 113 °F)
Horizontal
40 °C
(~ 105 °F)
60 °C
(~ 140 °F)
60 °C
(~ 140 °F)
25 °C
(~ 86 °F)
30 °C
(~ 95 °F)
45 °C
(~ 113 °F)
50 °C
(~ 122 °F)
25 °C
(~ 77 °F)
30 °C
(~ 86 °F)
40 °C
(~ 104 °F)
45 °C
(~ 113 °F)
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