11
Operating Conditions
MS Motors
MS 402
Pumped Liquids
MS 402 is generally recommended for operation in
water without any appreciable amount of chloride at
common groundwater temperatures.
• MS402 is made of 304 stainless steel AISI
Sand Content
Max. sand content in pumped liquid: 50 ppm.
Ambient Pressure
Max. 20 bar ~ 290 psi.
It is generally not recommended to install the motor for
operation in a vacuum.
Cooling
Cooling of the motor depends on temperature and
velocity of flow of the pumped liquid past the motor. In
order to ensure sufficient cooling, the values for max.
temperature of the pumped liquid and its velocity of flow
past the motor stated in the table to the right must be
kept.
Note: The temperature limits are based on the condi-
tion that the other operating conditions are as specified
in this Product Guide.
In case the actual temperature of the pumped liquid is
higher than the one stated in the table, or if the oper-
ating conditions are especially unfavourable, please
contact Grundfos.
Free Convection
Free convection is achieved when the diameter of the
borehole is at least 2" (~ 50 mm) bigger than the outer
diameter of the motor, or if the motor is installed in the
borehole screen.
Fig. 2 Free Convection
Fig. 3 Flow of Pumped Liquid past the Motor
Velocity of Flow Past
the Motor
Max. Temperature of Pumped Liquid
Vertical
Installation
Horizontal
Installation
0.0 f/s
(Free Convection)
30°C
(86°F)
Flow sleeve
recommended
Min. 0.25 f/s
40°C
(104°F)
40°C
(105°F)
TM00 5122 5094TM00 5123 5094
ø95
ø145
MS.book Page 11 Wednesday, January 26, 2005 3:25 PM
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