013 Wear Rings

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  • Wear rings are designed to wear out so the pump won’t have to. Because of the way water moves through the pump case, and because of the tight tolerances between components (required for efficiency,) The pump case is vulnerable to wear. Wear rings help prevent this. Here, we’ll look at how water moves through the pump case, how efficiency is achieved, how damage can occur, and How wear rings help pump designers deal with these issues.
  • 013 Wear Rings

    1. 1. <ul><li>We’ll be looking at how: </li></ul><ul><ul><li>Water moves through the pump case </li></ul></ul><ul><ul><li>Efficiency is achieved </li></ul></ul><ul><ul><li>Damage can occur </li></ul></ul><ul><ul><li>Wear rings can help </li></ul></ul>Wear Rings Something you wear? Or something that prevents Wear? MENU
    2. 2. <ul><ul><li>Water moves from high to low-pressure zones </li></ul></ul><ul><ul><li>Some water is re-pumped </li></ul></ul><ul><ul><li>This reduces pump efficiency </li></ul></ul>Water Movement Inside the Case Low-Pressure Zone High-Pressure Zone MENU
    3. 3. <ul><li>Limiting recirculation improves efficiency </li></ul><ul><li>Physical separation between high and low-pressure zones </li></ul>Improving Efficiency Low-Pressure Zone High-Pressure Zone MENU
    4. 4. <ul><li>Physical separation by moving impeller closer to suction port </li></ul>Improving Efficiency – Semi-Open Impellers MENU
    5. 5. <ul><ul><li>Reduced gap between volute and impeller bull-nose </li></ul></ul><ul><ul><li>The bull-nose: suction-side protrusion on the impeller </li></ul></ul>Improving Efficiency – Closed Impellers MENU
    6. 6. <ul><li>Re-pumped water abrades the volute and impeller. </li></ul><ul><li>Efficiency reduced </li></ul><ul><li>But there’s a solution </li></ul>Damage to the Case MENU
    7. 7. <ul><li>Wear rings are installed in the volute case </li></ul><ul><li>More durable than volute itself </li></ul><ul><li>Often designed to be replaced </li></ul>Casing Wear Rings MENU
    8. 8. Wear Ring Materials Many wear-ring materials Commonly made from stainless steel and bronze MENU
    9. 9. <ul><li>Wear rings can be replaceable or non-replaceable </li></ul><ul><li>Replaceable variety not cost-effective for smaller pumps </li></ul><ul><li>Large pumps usually have replaceable wear rings </li></ul>Replaceable/Non-Replaceable No thanks Used wear rings, make me an offer MENU
    10. 10. Apply Your Knowledge What is one cause of decreased pump efficiency? Water that gets re-pumped C B Narrow gaps between impeller and volute A Wear rings
    11. 11. Apply Your Knowledge What is one cause of decreased pump efficiency? Sorry, that’s incorrect LET’S REVIEW Water that gets re-pumped C B Narrow gaps between impeller and volute A Wear rings
    12. 12. Apply Your Knowledge What is one cause of decreased pump efficiency? Sorry, that’s incorrect LET’S REVIEW Water that gets re-pumped C B Narrow gaps between impeller and volute A Wear rings
    13. 13. Apply Your Knowledge What is one cause of decreased pump efficiency? That is correct ! <ul><ul><li>CLICK NEXT </li></ul></ul><ul><ul><li>to continue </li></ul></ul>Water that gets re-pumped C B Narrow gaps between impeller and volute A Wear rings

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