High axial vibration at 1x, 2x and 3x (2x may be higher than 1x).
Phase relationship across coupling typically ~180°.
1x radial vibration trends up over time due to “unraveling” of disc pack.
General appearance
Fracture near bolt hole.
Fretting at fracture location.
Fracture may occur through bolt hole.
Typical causes
Thermal movement.
Foundation setting.
Pipe strain.
Loose anchor bolt/ studs.
Poor initial alignment.
Corrective actions
Check parallel offset AND face runout on each side as the angularity (offset + face runout) may be different between ends.
Review thermal growth values of equipment (if applicable) and perform hot alignment.
AXIAL MISALIGNMENT
Possible Symptoms:
Elevated axial vibration and fluctuation in motor current if motor rotor off magnetic center.
Increased thrust bearing temperature.
Can see a “pulsing effect” in axial readings due to thrusting.
General appearance
Fracture near bolt hole.
May occur on both sides of bolt hole.
Typical causes
Incorrect thermal growth.
Equipment not on mag. center.
Incorrect magnetic center.
Poor initial alignment.
Corrective actions
Check axial spacing, coupling axial capacity, and equipment end play.
Verify motor rotor is on magnetic center.
Review thermal growth values of equipment.
TORQUE OVERLOAD
Possible Symptoms:
Typically instantaneous failure, difficult to predict.
Imbalance created from buckled disc packs.
Audible noise due to yielding of disc pack.
General appearance
Buckling of disc pack.
Severe spreading.
Spreading in consecutive links.
Disc pack bolts may contact clearance holes.
Typical causes
Electrical fault.
Liquid slug in compressor.
High start up torque.
Operation/process event.
Corrective actions
Inspection for crack initiation, replace coupling elements at a minimum immediately.
Check sizing and Service Factor of Coupling – possible application for shear pin/shear spacer design.
Review operational history for any atypical events.
TORSIONAL OSCILLATION
Possible Symptoms:
Difficult to detect without torque measurements.
Correlation between vibratory torque frequency and radial vibration may be present in geared trains.
General appearance
Fracture in center of disk link.
Fretting at clamping area and in the center of the link.
Typical causes
Excitation from VFD drive.
Torsional issue.
"Whipping action” on start due to motor slip.
Corrective actions
Review system torsionals and tune coupling stiffness/ inertias, if necessary.
Troubleshoot with torque monitoring system.
Review VFD drive parameters (if applicable).
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