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Application – All Motors
Table 7 lists the approximate head loss due to fl ow
between an average length motor and smooth casing or
fl ow inducer sleeve.
Head Loss From Flow Past Motor
Hot Water Applications (Standard Motors)
Franklin Electric offers a line of Hi-Temp motors
which are designed to operate in water with
various temperatures up to 194 °F (90 °C) without
increased fl ow. When a standard pump-motor
operates in water hotter than 86 °F (30 °C), a fl ow
rate of at least 3 ft/s is required. When selecting
the motor to drive a pump in over 86 °F (30 °C)
water, the motor horsepower must be de-rated per
the following procedure.
1. Using table 7A, determine pump gpm required
for different well or sleeve diameters. If
necessary, add a fl ow sleeve to obtain at least
3 ft/s fl ow rate.
MOTOR DIAMETER 4" 4" 4" 6" 6" 6" 8" 8"
CASING ID IN INCHES (MM) 4 (102) 5 (127) 6 (152) 6 (152) 7 (178) 8 (203) 8.1 (206) 10 (254)
Flow Rate in gpm (l/m)
25 (95) 0.3 (.09)
50 (189) 1.2 (.37)
100 (378) 4.7 (1.4) 0.3 (.09) 1.7 (.52)
150 (568) 10.2 (3.1) 0.6 (.18) 0.2 (.06) 3.7 (1.1)
200 (757) 1.1 (.34) 0.4 (.12) 6.3 (1.9) 0.5 (.15) 6.8 (2.1)
250 (946) 1.8 (.55) 0.7 (.21) 9.6 (2.9) 0.8 (.24) 10.4 (3.2)
300 (1136) 2.5 (.75) 1.0 (.30) 13.6 (4.1) 1.2 (.37) 0.2 (.06) 14.6 (4.5)
400 (1514) 23.7 (7.2) 2.0 (.61) 0.4 (.12) 24.6 (7.5)
500 (1893) 3.1 (.94) 0.7 (.21) 37.3 (11.4) 0.6 (0.2)
600 (2271) 4.4 (1.3) 1.0 (.30) 52.2 (15.9) 0.8 (0.3)
800 (3028) 1.5 (0.5)
1000 (3785) 2.4 (0.7)
Table 7 Head Loss in Feet (Meters) at Various Flow Rates
CASING OR
SLEEVE ID
4" HIGH
THRUST MOTOR
6" MOTOR 8" MOTOR
INCHES (MM) GPM (L/M) GPM (L/M) GPM (L/M)
4 (102) 15 (57)
5 (127) 80 (303)
6 (152) 160 (606) 52 (197)
7 (178) 150 (568)
8 (203) 260 (984) 60 (227)
10 (254) 520 (1970) 330 (1250)
12 (305) 650 (2460)
14 (356) 1020 (3860)
16 (406) 1460 (5530)
Table 7A Minimum gpm (l/m) Required for
3 ft/s (.91 m/sec) Flow Rate
7