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Application – Three-Phase Motors
Design And Operational Requirements
1. Non-Vertical Operation: Vertical Shaft-up (0°) to
Horizontal (90°) operation is acceptable as long as
the pump transmits “down-thrust” to the motor within
3 seconds after start-up and continuously during
operation. However, it is best practice to provide a
positive slope whenever it is possible, even if it is only
a few degrees.
2. Motor, Sleeve, and Pump Support System: The
booster sleeve ID must be sized according to the
motor cooling and pump NPSHR requirements. The
support system must support the motor’s weight,
prevent motor rotation and keep the motor and pump
aligned. The support system must also allow for
thermal axial expansion of the motor without creating
binding forces.
3. Motor Support Points: A minimum of two support
points are required on the motor. One in the motor/
pump fl ange connection area and one in the bottom
end of the motor area. The motor castings, not the
shell area, are recommended as support points. If the
support is a full length support and/or has bands in
the shell area, they must not restrict heat transfer or
deform the shell.
4. Motor Support Material and Design: The support
system shall not create any areas of cavitation or
other areas of reduced fl ow less than the minimum
rate required by this manual. They should also be
designed to minimize turbulence and vibration and
provide stable alignment. The support materials and
locations must not inhibit the heat transfer away from
the motor.
5. Motor and Pump Alignment: The maximum
allowable misalignment between the motor, pump,
and pump discharge is 0.025 inch per 12 inches of
length (2 mm per 1000 mm of length). This must be
measured in both directions along the assembly using
the motor/pump fl ange connection as the starting
point. The booster sleeve and support system must
be rigid enough to maintain this alignment during
assembly, shipping, operation and maintenance.
6. The best motor lubrication and heat resistance is
obtained with the factory based propylene glycol
fi ll solution. Only when an application MUST HAVE
deionized (DI) water should the factory fi ll solution
be replaced. When a deionized water fi ll is required,
the motor must be derated as indicated on the below
chart. The exchange of the motor fi ll solution to DI
Inline Booster Pump Systems (continued)
water must be done by an approved Franklin service
shop or representative using a vacuum fi ll system
per Franklin’s Motor Service Manual instruction. The
motor shell then must be permanently stamped with a
D closely behind the Serial Number.
The maximum pressure that can be applied to the
motor internal components during the removal of the
factory fi ll solution is 7 psi (0.5 bar.)
First: Determine maximum Feed Water Temperature
that will be experienced in this application. If the
feed water exceeds the maximum ambient of the
motor, both the DI water derating and a hot water
application derating must be applied.
Second: Determine the Pump Load Multiplier from the
appropriate Service Factor curve. (Typical 1.15
Service Factor is for 60 Hz ratings &1.00 Service
Factor for 50 Hz ratings).
Third: Multiply the Pump Load Requirement times the pump
load multiplier number indicated on the vertical axis
to determine the Minimum Motor Nameplate Rating.
Fourth: Select a motor with a nameplate equal or higher than
the above calculated value.
7. Motor Alterations - Sand Slinger & Check Valve
Plug: On 6" and 8" motors, the rubber sand slinger
located on the shaft must be removed. The pipe plug
covering the check valve must be removed from Ni-
resist and 316 SS motors. The special Booster motor
already has these alterations made.
8. Frequency of Starts: Fewer than 10 starts per
24-hour period are recommended. Allow at least 20
minutes between shutdown and start-up of the motor.
FIG. 12
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
30 25 20 15 10
35
40
1.75
1.65
1.55
1.45
1.35
1.25
1.15
1.05
1.00 Service Factor (50Hz)
1.15 Service Factor (60Hz)
Derating Factor for Motors That Must Have Their Factory Fill
Replaced With Deionized Water 8" Encapsulated Motor
Feed Water Temperature (°C)
Pump Load Multiplier
36