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Best practices when trim-cutting closed-pump impellers

02.01.2014  |  Bloch, H. P.,  Hydrocarbon Processing Staff, 

Keywords: [pump] [impellor] [closed pump] [head]

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:

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