February 2014

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HP Reliability: Best practices when trim-cutting closed-pump impellers

Experienced reliability professionals will implement least-risk solutions whenever possible. The following example relates to impeller trimming to reduce the diameter of a fixed-speed centrifugal pump..

Bloch, H. P., Hydrocarbon Processing Staff

Experienced reliability professionals will implement least-risk solutions whenever possible. The following example relates to impeller trimming to reduce the diameter of a fixed-speed centrifugal pump’s impeller. Diameter reductions accommodate a lesser head (lower differential pressure) requirement. Eq. 1 describes an approximate relationship given by common fan laws: H’ / H = D’2 / D2      (1) In Eq. 1, H and D are the original values for the head and impeller diameter; H’ and D’ represent the reduced (after machining) values of H and D. The pump user or designer with H’/H can measure the original impeller diameter, D. With this inf

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