English (GB)
7
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.
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.
1
At an ambient pressure of minimum 1 bar (0.1 MPa).
2
At an ambient pressure of minimum 2 bar (0.2 MPa).
5.4.1 Flow velocity formula
5.5 Pipe connection
If noise may be transmitted to the building through the pipes, we
recommend that you use plastic pipes.
When using plastic pipes, secure the pump by an unloaded
straining wire.
When connecting plastic pipes, use a compression coupling
between the pump and the first pipe section.
6. Electrical connection
In cases where the stated flow velocity cannot be
achieved, a flow sleeve must be installed.
Motor
Installation
Flow
past the
motor
[m/s]
Vertical
Horizontal
MS402
MS4000 (T40)
MS6000 (T40)
0.15
40 °C
(105 °F)
40 °C
(105 °F)
MS6000P (T60)
0.15
60 °C
(140 °F)
60 °C
(140 °F)
MS4000I (T60)
1
MS6000 (T60)
1
1.00
60 °C
(140 °F)
Flow sleeve
recommended
60 °C
(140 °F)
Flow sleeve
recommended
MS6000 (T60)
2
0.15
60 °C
(140 °F)
Flow sleeve
recommended
60 °C
(140 °F)
Flow sleeve
recommended
MMS6
PVC
windings
0.20
25 °C
(86 °F)
25 °C
(86 °F)
0.50
30 °C
(95 °F)
30 °C
(95 °F)
PE/PA
windings
0.20
45 °C
(113 °F)
45 °C
(113 °F)
0.50
50 °C
(122 °F)
50 °C
(122 °F)
MMS
8000
to
12000
PVC
windings
0.15
25 °C
(77 °F)
25 °C
(77 °F)
0.50
30 °C
(86 °F)
30 °C
(86 °F)
PE/PA
windings
0.15
40 °C
(104 °F)
40 °C
(104 °F)
0.50
45 °C
(113 °F)
45 °C
(113 °F)
V =
Q x 353
[m/s]
D
2
- d
2
Q
m
3
/h
Flow rate
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.
Plastic pipes are recommended for 4" pumps only.
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.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before starting any
work on the product.
- Make sure that the power supply cannot be
accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- The pump must be earthed.
- The pump must be connected to an external main
switch and shall be provided with a means
permitting it to be locked in the OFF (isolated)
position. Type and requirements as specified in EN
60204-1, 5.3.2
The electrical connection must be carried out by an
authorised person in accordance with local
regulations.
