Liquid Temperatures And Motor Cooling; Pipe Connection - Grundfos SP 1A Montage- Und Betriebsanleitung

5.4 Liquid temperatures and motor 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.
In cases where the stated flow velocity cannot be ach-
ieved, 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.
Flow
Motor
past the
motor
[m/s]
MS402
MS4000 (T40) 0.15
MS6000 (T40)
MS6000P (T60) 0.15
1
MS4000I (T60)
1.00
2
MS6000 (T60 )
2
0.15
MS6000 (T60)
0.20
PVC wind-
ings
0.50
MMS6
0.20
PE/PA
windings
0.50
0.15
PVC wind-
ings
0.50
MMS
8000 to
12000
0.15
PE/PA
windings
0.50
1 At an ambient pressure of minimum 1 bar (0.1 MPa).
2 At an ambient pressure of minimum 2 bar (0.2 MPa).
Installation
Vertical Horizontal
40 °C 40 °C
(105 °F) (105 °F)
60 °C 60 °C
(140 °F) (140 °F)
60 °C 60 °C
(140 °F) (140 °F)
Flow sleeve Flow sleeve
recommended recommended
60 °C 60 °C
(140 °F) (140 °F)
Flow sleeve Flow sleeve
recommended recommended
25 °C 25 °C
(86 °F) (86 °F)
30 °C 30 °C
(95 °F) (95 °F)
45 °C 45 °C
(113 °F) (113 °F)
50 °C 50 °C
(122 °F) (122 °F)
25 °C 25 °C
(77 °F) (77 °F)
30 °C 30 °C
(86 °F) (86 °F)
40 °C 40 °C
(104 °F) (104 °F)
45 °C 45 °C
(113 °F) (113 °F)
5.4.1 Flow velocity formula
Q x 353
V =
2
D
3
Q Flow rate
m /h
D mm Sleeve diameter or borehole diameter
d mm Pump diameter
For 37 kW MMS6 (only PVC windings), 110 kW MMS8000
and 170 kW MMS10000, the maximum liquid temperature
is 5 °C lower than the values stated in the above table.
For 190 kW MMS10000, 220-250 kW MMS12000/50 Hz
and MMS12000/60 Hz, the temperature is 10 °C lower.

5.5 Pipe connection

If noise may be transmitted to the building through the pipes, we
recommend that you use plastic pipes.
Plastic pipes are recommended for 4" pumps only.
When using plastic pipes, secure the pump by an unloaded
straining wire.
WARNING
Hot liquid
Death or serious personal injury
‐
Use pipes designed for the maximum pump pressure
plus 10 % to avoid pipe burst.
‐
Make sure that the plastic pipes are suitable for the
actual liquid temperature.
When connecting plastic pipes, use a compression coupling
between the pump and the first pipe section.
[m/s]
2
- d
11