How can one determine the number of stages of a pump by examining the rotor that has been removed from it?
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How can one determine the number of stages of a pump by examining the rotor that has been removed from it? For example, how many stages are the rotors in the images below?
This post was last edited by CHANGBAISHI on 2018-12-11 at 16:47. It should be a screw that functions as the first stage, or several screws meshed together to function as the first stage.
One W represents one lead, and one lead corresponds to one stage
Where did you find it? It seems there are no books or manuals on this topic
For single-screw pumps, it is generally referred to in terms of the number of leads; the number of stages corresponds to the number of casing sections connected. A single-screw screw generally has a lead of 0.6 MPa. As for the rotor, I’m not sure yet, but I think it shouldn’t be visible. It seems that there is no concept of grading for twin-screw and triple-screw systems. Multiple stages are usually used for pressure enhancement, but the theoretical outlet pressure of a single-stage positive displacement pump is infinitely high, so it seems to serve little purpose.