Technical Data; Motor Cooling Requirements - Grundfos SP Series Installation And Operating Instructions Manual

10. Technical data

10.1 Motor cooling requirements

10.1.1 Maximum water temperature - minimum velocity/flow past the motor
Minimum well casing or
Motor type
MS 402 / MS 4000
MS 402 / MS 4000
MS 6000 (T40)
MS 6000 (T60)
MS 6000P
MMS 6 (T30)
MMS 6 (T50)
MMS 8000 (T30)
MMS 6 (T50)
MS 10000
(175, 200 hp)
MS 10000
(250 hp)
* A flow inducer or flow sleeve must be used if the water enters the well above the motor or if there is insufficient water flow past the motor.
ft/s = feet per second
For MMS6, 50 hp and MMS 8000, 150 hp, the maximum
liquid temperature is 9 °F (5 °C) lower than the values
stated in the above table. For MMS10000, 250 hp,
temperature is 18 °F (10 °C) lower.
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Maximum water temperature - minimum velocity/flow past the motor
Minimum velocity
sleeve diameter
[in (mm)] [ft/s (m/s)]
4 (102) 0.00 (0.00)
4 (102) 0.25 (0.08)
6 (152) 0.50 (0.15)
6 (152) 3.30 (1.00)
6 (152) 0.50 (0.15)
6 (152) 0.15 (0.05)
6 (152) 0.15 (0.05)
8 (203) 0.50 (0.15)
8 (203) 0.50 (0.15)
10 (254) 0.50 (0.15)
10 (254) 0.50 (0.15)
Maximum temperature of the pumped liquid
Minimum flow
Vertical installation
3
[°F (°C)]
[gpm (m /h)]
0.0 (0.0) 86 (30)
1.2 (0.27) 104 (40)
9 (2) 104 (40)
30 (6.8) 140 (60)
9 (2) 140 (60)
13 (3) 86 (30)
13 (3) 122 (50)
25 (5.7) 86 (30)
25 (5.7) 122 (50)
55 (12.5) 86 (30)
41 (9.3) 68 (20)
Horizontal installation
[°F (°C)]
Flow sleeve
recommended *
104 (40)
104 (40)
140 (60)
140 (60)
86 (30)
122 (50)
86 (30)
122 (50)
86 (30)
68 (20)