AIM Manual
Motor Application » Pumptec Products (Page 7)
Head Loss From Flow Past Motor
Table 7 lists the approximate head loss due to flow between an average length motor and smooth casing or flow inducer sleeve.
Table 7 Head Loss in Feet (Meters) at Various Flow Rates
| 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) | ||||||||
Hot Water Applications
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 flow. When a standard pump-motor operates in water hotter than 86 °F (30 °C), a flow 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 flow sleeve to obtain at least 3 ft/s flow rate.
Table 7A Minimum gpm (l/m) Required for 3 ft/s (.91 m/sec) Flow Rate
| 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 | ||||