GRUNDFOS SP submersible pumps are designed specifically for
borehole supply applications. They are of multistage centrifugal
impeller design and all parts are made from stainless steel with
water lubricated rubber bearings. A submersible motor is fitted
beneath the pump and suction is effected through a strainer between
the pump and motor.
Standard pumps are designed for the pumping of non-aggressive
water. An 'N' version is available for applications requiring a
higher degree of corrosion resistance.
MOTOR
The pumps are coupled to a sealed, liquid cooled *-pole
asynchronous squirrel-cage GRUNDFOS motor constructed of stainless
steel. Single phase motors are supplied complete with purpose
designed control boxes, while three phase motors require a remote
Direct-on-Line starter. For complete control including wireless low
level and unstable main supply power a DAYLIFF electronic pump
controller is recommended. Note that due to the low starting
torques of submersible motors it is recommended that DOL starters
are used for all motor sizes.
