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Liquiflo Installation, Operation & Maintenance Manual
3.10
Motor Selection
1)
For the Close-Coupled configuration, the motor frame size is part of the pump model coding and is
selected at the time the pump is ordered. The motor frame must have a C-face for compatibility with the
pump mounting bracket. Refer to Position 5 of the pump model code (see Table 6 on page 5).
2)
For the Long-Coupled configuration, the motor is mechanically-coupled to the Power Frame ancillary
device. In this case, any suitable motor frame can be used.
3)
For all configurations of the pump, a Foot-Mount motor is required for mounting to a base (see cover
photos and diagram on page 10).
4)
The motor must have an enclosure that is compatible with the application conditions. If an explosion-
proof motor is required, the temperature code of the motor must be acceptable for the process fluid.
5)
The motor speed and power rating are usually determined at the time the pump is ordered to meet the
specified conditions of service. For thin liquids, the Head vs. Flow Performance Curves can be used
directly to determine the speed and brake horsepower (BHP) requirements, as well as the required
impeller diameter. For liquids heavier than water, the BHP obtained from the Performance Curves
must be multiplied by the Specific Gravity of the liquid to determine the BHP required. For viscous
fluids, a viscosity correction is required (see Section 3.9). Additional power is required to overcome
the friction losses due to viscosity.
3.11
Motor Shaft Direction
The motor shaft must turn in the direction required by the centrifugal pump. Looking at the pump end, the motor
shaft must rotate counter-clockwise, as shown below.
Counter-clockwise
rotation of motor
shaft & impeller
Centry
Model 620 – Sealed
13
®
Series Centrifugal Pumps
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