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14. WATER TEMPERATURE AND FLOW
PEARL standard submersible motors are designed to operate up to maximum service factor
horsepower in water up to 95°F (35°C).
A minimum flow of 0.98 ft/sec for 4" motors is required for proper cooling.
Table 3: Minimum GPM required for motor cooling in water up to 95°F (35°C)
Minimum GPM required for motor cooling in water up to 95°F (35°C)
4"
5"
6"
7"
8"
10"
12"
14"
16"
The table shows minimum flow rates, in GPM, for various well diameters and motor sizes
15. FLOW INDUCER SLEEVE
If the flow rate is less than specified or coming from above the pump, then a flow inducer sleeve must be used. A flow
sleeve is always required in an open body of water.
Figure shows a typical flow inducer sleeve construction.
Example : A four-inch motor and pump that delivers 60 GPM will be installed in a 8" well.
From Table 2
A 122 GPM flow would be required to maintain proper cooling in an 8" casing, as the 6" casing
requires a min flow of 55gpm then adding an 6" or smaller flow sleeve provides the required cooling.
Worm Worm clamps
Intake
Flow inducer sleeve
Submersible motor
Centering bolt
Centering bolts must
be located on motor
casting. Do not locate
on stator shell
Casing or Sleeve
I.D. Inches (mm)
102
127
152
178
203
254
305
356
406
4MWP
4" Submersible Motors
4" Motor (1/2-10Hp)
0.98 ft/sec (0.3m/sec)
GPM (l/min)
6.5 (24.5)
28 (106)
55 (208)
86 (325)
122 (461)
209 (791)
315 (1192)
440 (1665)
585 (2214)
Saw cuts
Notch out for cable guard
Lock nuts inside sleeve
Bottom view
Centering bolt hole
(3 required) 120°
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