If looseness (harmonic) indication found in machine both side ( Pump and Motor ) what are the possible causes of the problem?

Thank you,
Christoffel Sinaga
christoffel_sinaga@tobapulp.com

Hello Christoffel:

Rule of thumb, anytime you see multiple harmonics odd, even or both assume loosneness. Check your harmonics on the pump of RPM, check amplitude in the vertical direction as well. Usually in your description of harmonics across the coupling, could be a base or grouting problem. Key is if the vertical vibration exceeds the radial by more than 50%.

Bill Prusak
http://ewavetech.com
Asheville, NC

You might also want to review the condition of your coupling dependent of type of coupling installed.