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IOM/GK(P)/CONICAL ISSUE DATE: 10.11.2015
Page 63 LAST REV. DATE: 01.08.2019
CORRECT
STEEL STRAIGHT EDGE
INCORRECT PARALLEL
MISALIGNMENT
STEEL STRAIGHT EDGE
STEEL STRAIGHT EDGE
INCORRECT ANGULAR
MISALIGNMENT
2) Parallel misalignment – Shaft with axis parallel, but not concentric.
Maximum allowable misalignment is 0.1 mm.
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.
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.