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This is a proprietary document of Kirloskar Brothers Limited, Kirloskarvadi-416308, Dist-Sangli (India)
ISSUE DATE: 17.09.2010 LAST REV. DATE:
CORRECT
STEEL STRAIGHT EDGE
INCORRECT PARALLEL
MISALIGNMENT
STEEL STRAIGHT EDGE
STEEL STRAIGHT EDGE
INCORRECT ANGULAR
MISALIGNMENT
LEVELING THE UNIT
When the unit is received with the pump and driver mounted on the base plate, it should be placed on
the foundation and the coupling halves disconnected. The coupling should not be reconnected until all
misalignment operations have been completed. The base plate must be supported evenly on wedges
inserted under the four corners so that it will not be distorted or sprung by the uneven distribution of
the weight. Adjust the wedges until the shafts of the pump and the driver are in level. Check the
coupling faces, suction and discharge flanges for the horizontal and vertical position by means of
spirit level.
FLEXIBLE COUPLING ALIGNMENT
The two halves of the coupling should be at least 3 mm apart so that they cannot touch each other
when the driver shaft is rotated. Necessary tools for approximately checking are straight edge or an
outside caliper. A check for parallel misalignment is made by placing a straight edge across both
coupling periphery at the top, bottom and both the sides. The unit will be in parallel alignment when
the straight edge rests evenly on the coupling periphery at all the positions. Care must be taken that
the straight edge must be parallel to the axis of the shaft. May be other alternative method like laser
can be used.
GROUTING
When the alignment is correct, the foundation bolts should be tightened evenly but not too firmly.
The unit can then be grouted by working soft concrete under the edges. Foundation bolts should not
be fully tightened until the grout is hardened, usually 48 hours after pouring.
FACTORS THAT MAY DISTURB ALIGNMENT
The unit should be periodically checked for alignment. If the unit does not stay in line after being
properly installed, the following are possible causes:
1. Setting, seasoning of the foundation.
2. Pipe strains distorting or shifting the machines.
3. Wear of the bearing.
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