ALIGNING PUMP / MOTOR

After the base plate has been fixed in position carefully check the coupling and if necessary, realign the pump set (with the motor). Prior to checking the alignment and/or aligning, loosen supporting foot and tighten again without transmitting any strain. Please check the alignment of pump motor and coupling even though they are supplied ready mounted on base frame.

The pump set to be aligned radial and axial within 0.1mm by installing dial indicators as shown in fig no.1 and without pipe connection. The gap between the two coupling halves must be the same at all points (minimum 3 points) on the circumference, this can be measured using caliper or a feeler gauge.
The alignment should be carried with & without pipe connections and should limits. For liquids handling more than 150 C, cold alignment & hot alignment both should be carried out on pump set.

What is Pump Alignment?

The alignment of pump shaft couplings and motor drive shafts is
critical to ensure efficient running and to reduce the risk of
breakdown.
Misaligned pumps and drives result in vibrations and premature wear of
bearings, seals and couplings.

It is a recognised statistic that over
50% of plant failures are a result of misalignment.

Benefits of Pump Alignment :

• Reduced vibration levels
• Increased meantime between failures
• Reduced maintenance costs
• Reduced energy consumption
• Increased production quantity
• Improved plant safety

Part Of a Centrifugal Pump

INSTALLING THE PUMP/UNIT

After placing the unit on the foundation, align it with the help of a spirit level placed on the shaft/discharge nozzle. The correct distance between the coupling halves as specified in the general arrangement drawing must be observed. Shims shall be fitted between the base plate / foundation frame and the foundation it self, they shall always be inserted to the left and right of the foundation bolts and in close proximity to these bolts.
For a bolt to bolt clearance of more than 800mm, additional shims must be inserted halfway between the adjoining holes. All shims must lie perfectly flush.


Tighten the foundation bolts evenly and firmly. Base plate up to 400mm wide made of channel section steel are torsion resistant in their own right and need not be grouted. After fastening, base plate more than 400 mm wide made of folded steel plate must be grouted up to the upper edge via the holes (Ø 120 mm) in the folded plate, using low shrinkage concrete.