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Angular Misalignment
Possible Symptoms
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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