Centrifugal pump diaphragm coupling alignment
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When aligning a centrifugal pump, it is generally required that the motor be 5 bore levels higher than the pump. What does this mean?
It means that the axis centerline of the motor should be 0.05 mm higher than the axis centerline of the pump
Currently, it is only cold-state alignment; the heat of the medium, that is, the expansion of the pump casing, is taken into account
“When aligning a centrifugal pump, the motor is generally placed 5 inches higher than the pump. The reason for placing it 5 inches higher is that the temperature of the pump body increases significantly during operation, causing its center to rise a few inches until it reaches the same height as the motor. The height of this value is calculated by the manufacturer based on the respective temperature rises of the pump body and the motor during operation, as well as their respective linear expansion coefficients; refer to the user manual when installing and using it.
Thermal expansion is the main consideration. When driven by a turbine, the turbine should be set at a slightly lower level.