Grundfos SP Pump Minimum Flow Requirements
Motor
Diameter
4"
6"
8"
10"
Casing or Sleeve
I.D. in Inches
4
5
6
7
8
6
7
8
10
12
14
16
8
10
12
14
16
10
12
14
16
18
Minimum Flow Past
the Motor (GPM)
1.2
7
13
21
30
10
28
45
85
140
198
275
10
55
110
180
255
30
85
145
220
305
NOTES:
A) A flow inducer or sleeve must be used if the water enters the well above the
motor or if there is insufficient water flow past the motor.
B) The numbers above are based on a minimum water velocity of 0.25 feet per
second over 4” motors, and 0.5 feet per second over 6”, 8”, and 10” motors.
Revised 7/26/1999