From Scrap To Like New

A brick manufacturer had a large fan that pulls air, brick and cement dust thru an overhead duct system into a bag house then through the fan and up a stack. The baghouse requires cleaning frequently and during the cleaning cycle the baghouse is bypassed and the material goes through the fan. This causes buildup on the fan blades and thus an imbalance and vibration. The vibration is so severe it cracks the motor base, bearing base and fan housing. The customer has attempted to deal with this by filling the fan base with concrete, welding large angle iron to the [...]

From Scrap To Like New2019-09-03T20:16:15-04:00

Loose Motor Bases: Motor Vibration (A Simple Solution)

When analyzing motors, it is easy to read more into a problem than actually exists. This case history illustrates the need to always look for the simple solution first. While at a power plant working on a large fan, the vibration analyst requested that a large mill motor be examined. The motor had been sent out to motor shops twice. In each instance, the vibration remained high when the motor was put back into operation. Attempts were made to field balance the motor, however, they were unsuccessful. The motor continued to have amplitudes of 8 mils of vibration, all of which [...]

Loose Motor Bases: Motor Vibration (A Simple Solution)2019-09-09T18:02:12-04:00

Installing VFD Drives On Vertical Pumps and Structural Vibration Problems

By: Nelson Baxter It is well known that the installation of VFD drives has the possibility of introducing vibration problems on rotating equipment.  When a machine runs through a wide speed range the probability of operating at or near a resonance is significantly increased as compared to a machine operating at a single frequency. VFDs are generally utilized to slow the speed of a machine down to match the load, thus saving energy and allowing better control of the process.  The inherent nature of the design of vertical pumps means that there is a large mass (the motor) sitting on top [...]

Installing VFD Drives On Vertical Pumps and Structural Vibration Problems2016-11-01T19:04:39-04:00


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