Measurement and adjustment of multi-stage pump crosshead movement!
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Hello! How is the forward/backward displacement of a multi-stage pump measured? I just can’t figure out whether ‘forward movement’ refers to single movement or not Then what is that backward movement called? So how is forward movement measured?
The displacement is referenced to the thrust bearing; generally, the direction of normal movement is considered positive, while the opposite direction is negative
The terms used to describe the axial movement of multi-stage pumps include total axial movement, partial axial movement, or axial movement in a certain direction. So why is it necessary to measure these amounts of axial movement? From a design perspective, this is done to ensure the safety of the equipment. As for installation, measuring these values serves two purposes: first, to check whether there are any issues with the installation process, and second, to facilitate the positioning of the rotor in its proper working position during installation.
In fact, there is no such thing as a method for measuring the forward and backward movement; what is measured actually is the total movement of the pump. The forward and backward movements are merely the results of allocating this total movement.