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Liquiflo Installation, Operation & Maintenance Manual
Section 3: Pump & Motor Installation
3.1
Installation of Pump, Motor & Base
Refer to the Hydraulic Institute Standards for proper installation procedures of the base, pump and motor.
1)
The pump inlet should be as close to the liquid source as practical and preferably below it.
Centrifugal pumps cannot be used in a suction lift arrangement unless the pump is primed before
starting. Many issues can be avoided with a flooded suction arrangement.
2)
For Close-Coupled Centry pumps, no alignment procedure between the pump and motor is required.
3)
For Long-Coupled Pumps utilizing the Power Frame:
(a) The mechanical coupling between the motor and Power Frame has a flexible insert that
must be free to move axially – typically a distance of 1/16 to 1/8 inches – to prevent axial loads
from being transmitted to the power frame.
(b) The motor and Power Frame shafts must be manually aligned to eliminate radial loads on
the pump that will cause vibration and lead to premature pump failure. Alignment of long-
coupled pumps is critical and should be checked by taking measurements of angularity and
parallelism at the coupling. If these are off by more than 0.015 inches (0.4 mm), the assembly
should be realigned. Flexible couplings are not intended to compensate for severe misalignment.
(NOTE: If the pump was delivered as a complete long-coupled assembly, it was properly aligned at
the factory.)
(c) Install the coupling guard over the mechanical coupling and fasten to the base plate.
(NOTE: If the pump was delivered as a complete long-coupled assembly, the coupling guard was
properly installed at the factory.)
Caution!
After performing alignment procedure, ensure that the Coupling Guard is replaced
before operating pump. Do not wear loose clothing around rotating objects.
NOTE: See pages 48-53 for diagrams of pump mounting options and Section 3.2 for more information about
the power frame.
3.2
Power Frame Option
If the Model Number of the pump contains the letter "P", the pump was ordered with the Liquiflo Power Frame
option. The power frame is a pedestal that supports the pump and allows it to be long-coupled to a motor. The
power frame has the following uses and advantages:
1)
The power frame allows motor frames that are not compatible with the pump mounting bracket to
be coupled to the pump. (For example, motor frames larger than NEMA 145TC, IEC motors or
frames without a C-face can be used.)
2)
The power frame enables the motor to be isolated from the pump simply by removing the flexible
coupling. (This is convenient for removing or replacing the motor, or when performing
maintenance.)
3)
The power frame thermally isolates the pump from the motor. (The power frame has an integral
cooling jacket that keeps the pedestal's bearing system cool even when the pump is operating at
maximum temperature.)
The power frame is shown in detail on page 10. The key components of the power frame are described below:
Bearings: The power frame shaft is supported by ball bearings on opposite ends of the pedestal. The oil
reservoir is used to lubricate the bearings. This reservoir is accessible by removing the two 1/8" NPT plugs on
the end of the casing.
Centry
Model 620 – Sealed
9
®
Series Centrifugal Pumps
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