{"id":29472,"date":"2026-09-03T12:14:40","date_gmt":"2026-09-03T09:14:40","guid":{"rendered":"http:\/\/localhost:8086\/?p=29472"},"modified":"2026-09-17T14:16:53","modified_gmt":"2026-09-17T11:16:53","slug":"obtochka-rabochih-koles-tsentrobezhnyh-nasosov","status":"publish","type":"post","link":"https:\/\/pumptech.by\/en\/obtochka-rabochih-koles-tsentrobezhnyh-nasosov\/","title":{"rendered":"Impeller Trimming for Centrifugal Pumps"},"content":{"rendered":"

Like any machine, a pump unit has a power requirement that determines the motor capacity needed.<\/p>\n\n\n\n

Pump power depends directly on head<\/strong>  and  flow rate<\/strong>, and is inversely proportional to its efficiency<\/strong>.<\/p>\n\n\n\n

Pump-unit efficiency can vary widely \u2014 from 20% to 98%<\/strong>.<\/p>\n\n\n\n

This wide range reflects differences in how the working element interacts with the pumped liquid.<\/p>\n\n\n\n

General principle:<\/strong> dynamic pumps, including centrifugal pumps, are generally less efficient than positive-displacement pumps.<\/p>\n\n\n\n

Efficiency is particularly important for large pumps.<\/p>\n\n\n\n

One way to improve centrifugal pump efficiency is impeller trimming<\/strong>. Matching the impeller to the required flow rate and head can deliver substantial energy savings, especially on large pump units.<\/p>\n\n\n\n

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Reducing the impeller diameter<\/strong> is a standard procedure described in pump reference books and operating manuals.<\/p>\n\n\n\n

Purpose of the procedure:<\/strong> to improve pump efficiency under the actual operating conditions.<\/p>\n\n\n\n

There are two main approaches to impeller trimming:<\/p>\n\n\n\n

1. Factory trimming:<\/strong><\/p>\n\n\n\n

    \n
  • If all operating parameters are known in advance, a pump can be ordered with an impeller already trimmed to the required diameter at the factory.<\/li>\n\n\n\n
  • This gives the pump an appropriate efficiency for the specified duty from the outset.<\/li>\n<\/ul>\n\n\n\n

    2. On-site trimming:<\/strong><\/p>\n\n\n\n

      \n
    • If some operating parameters are not yet known, the pump is supplied with the largest impeller diameter available for that model.<\/li>\n\n\n\n
    • Once all the operating parameters are known, the impeller is trimmed to the required diameter on site.<\/li>\n<\/ul>\n\n\n\n

      Benefits of reducing impeller diameter:<\/strong><\/p>\n\n\n\n

        \n
      • Improved pump efficiency by up to 20% or more;<\/li>\n\n\n\n
      • Lower energy consumption;<\/li>\n\n\n\n
      • Lower electricity costs;<\/li>\n\n\n\n
      • Reduced load on the power supply;<\/li>\n\n\n\n
      • Lower greenhouse-gas emissions;<\/li>\n\n\n\n
      • Increased pump output.<\/li>\n<\/ul>\n\n\n\n

        Important considerations:<\/strong><\/p>\n\n\n\n

          \n
        • Reducing the impeller diameter can reduce the pump\u2019s\u00a0head<\/strong>\u00a0 and \u00a0flow rate<\/strong>\u00a0.<\/li>\n\n\n\n
        • Impeller trimming must be carried out by qualified specialists using appropriate equipment.<\/li>\n\n\n\n
        • Before trimming, it is essential to\u00a0calculate carefully<\/strong>\u00a0the new impeller diameter.<\/li>\n<\/ul>\n\n\n\n

          Conclusion:<\/strong><\/p>\n\n\n\n

          Reducing a pump impeller\u2019s diameter can improve unit efficiency and optimise the cost of moving liquid.<\/p>\n\n\n\n

          Choose the appropriate method\u2014factory or on-site trimming\u2014and complete the necessary calculations carefully.<\/p>","protected":false},"excerpt":{"rendered":"

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