Upgrade of multi-stage pump stages

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Materials: The head of the multi-stage pump had a considerable margin of excess. By modifying the pump by adding stages and increasing the opening degree of the control valve on the outlet pipeline, the issues related to the need for capacity expansion in the system as well as excessive current were resolved. The pump performed well after the modification; it not only met the required operating conditions but also yielded good economic benefits. Discussion points: 1. Which stages should be added through staging? 2. Which components need to be machined after stage extraction? What’s the simplest way to do it? 3. What material is needed for machining shaft sleeves? (That is, what material should be used for the bushing?) 4. There is severe leakage at the bearings, and cooling water cannot be supplied – how can this be resolved? Before answering the question, please indicate which one you are responding to http://www.xjxdby.com/UploadFiles/2014221143056740.jpg