Centrifugal pumps belong to the subclass of dynamic axisymmetric fluid absorbing turbo machinery which transports fluid by converting the rotational kinetic energy to the hydrodynamic fluid flow. The rotational motion can be achieved either by a motor or an internal combustion engine. Centrifugal pumps are commonly used in water, petroleum, sewage and petrochemical pumping.

1. Electrical Engineering Centrifugal Pumps Vibration
Quantitative Research Proposal Centrifugal Pumps Vibration – Causes and Solutions
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Abstract
This quantitative research proposal is based on the causes of vibration in centrifugal pumps
and the ways to reduce it. It is highly necessary to be concerned about the vibration which
outcomes from the centrifugal pump as it mainly affects the performance output of the pump.
It is better if the vibration is monitored on the first time so that it can be eliminated suitable
damping techniques or tightening the loosened fasteners. Some of the components which are
seriously affected by vibrations are
• Shaft: Improper shaft movement affects the life of the mechanical seal. Vibration in
the shaft movement may cause chipping of the carbon face and may open the seal face.
• Packing: The radial movement of the shaft is directly related to the packing and the
packing is extremely sensitive. The vibration not only causes excessive leakage but also
causes wear in sleeve and shaft. The vibration gives high friction leading to excessive heat
dissipation. So additional flushing will be needed to control the heat dissipated in the pump.
• Bearings: The load from axial and radial movement are handled by bearings. The
bearings are not designed for vibration and it cannot withstand abnormal vibrations. So the
vibration causes dent on races of the bearing which may lead to severe damage of the
bearings.
• Rings and impeller: Critical dimensions and tolerances will be provided during
designing of pumps. So the vibration affects the wear ring clearance and impeller setting.
• Seals: They are very sensitive to the radial movement of the shaft. Due to vibration
caused in the pump, the seals will get damaged prematurely which increases shaft damage.
Another seal called labyrinth seal, which operates in a very close tolerance. If the vibration is
excessive those tolerances will be damaged very easily.