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Section 5....................................................................................Installation
5. INITIAL ALIGNMENT
Shaft alignment must be checked again after the final positioning of the pump unit and connection to
pipe work, as this may have disturbed the pump or motor mounting positions. If hot liquids (above 80
Deg C) are being pumped, alignment should be checked and reset with the pump and motor at their
normal operating temperature.
PUMP ALIGNMENT AND THERMAL EXPANSION
The pump and motor will normally have to be aligned at ambient temperature and
should be corrected to allow for thermal expansion at operating temperature.
5.1 Alignment Methods
Ensure pump and driver are isolated electrically and the half couplings are
disconnected
Align the motor to the pump, not the pump to the motor
Adjustment to correct the alignment in one direction may alter the alignment in another
direction. Always check in all directions after making any adjustment.
ALWAYS REMEMBER "A FLEXIBLE COUPLING IS NOT A UNIVERSAL JOINT"
Correct alignment is essential for the smooth operation of the pump. There are two types of
misalignment between the pump shaft and the drive shaft, which are:
Angular misalignment - Shaft with axis
concentric, but not parallel
This misalignment is checked by using a straight edge or any other device as shown in figure given
below. A spacer type flexible coupling is used to connect pump shaft to the driver. By using spacer
type of coupling, the complete rotating unit can be removed from the volute without removing pump
casing or rotor and without disconnecting piping connections. However other types of coupling can be
supplied on request.
ISO PRO Centrifugal Pump
Parallel misalignment - Shaft axis parallel, but
not concentric
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