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3.6
Coupling Alignment
Coupling alignment must be correct for successful operation. Flexible
couplings will not compensate for any appreciable misalignment. Rapid wear, noise,
vibration, and actual damage to the equipment may be caused by misalignment.
Therefore, the coupling must be aligned within the limits given.
The driver rotation must be checked before making up coupling. Actual
damage to the equipment and personal injury could result from operating the unit
with wrong rotation
The Centac compressor is furnished with a limited end float, spacer coupling between the
driver and the compressor. The total axial float on motor driven units is limited to
approximately three sixteenths (3/16) of an inch (4.8-mm). Turbine driven units are
supplied with the same type coupling without the limited end float feature.
Field coupling alignment is required for all Centac compressors. Before proceeding with
coupling alignment, check the unit to see that it is level. The unit must be level and grouted
before final alignment of the coupling.
As an aid in coupling alignment, make rigid brackets to bolt to the driver shaft coupling hub
and the compressor shaft-coupling hub. The rigid brackets should be long enough to reach
the opposite shaft-coupling hub. See Figure 3.1. A dial indicator should be attached to each
bracket arm to take readings.
Cold alignments are to be made on the coupling hubs. Alignment readings must be taken
on hubs that are free of lubricant or other foreign matter.
Bring the gearbox shaft-coupling hub into horizontal alignment with the compressor shaft-
coupling hub, using a dial indicator riding on the outer periphery of the compressor hub.
For couplings other than Ingersoll-Rand's standard gear-type coupling, please refer to the
vendor literature section.
The coupling alignment, and the coupling itself, must be checked before
operation.
Centac Instruction Manual
2000 Ingersoll-Rand Company
Date of Issue: 12 September, 2000
SECTION 3 – OPERATION
CAUTION
WARNING
CAUTION
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