September 2010

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HP Reliability: Eccentric reducers and straight runs of pipe at pump suction

Questions relating to proper reducer application in centrifugal pump suction lines date back many decades. Until his death (at age 84, in 1995), world-renowned pump expert Igor Karassik frequently cor..

Bloch, H. P., Hydrocarbon Processing Staff

Questions relating to proper reducer application in centrifugal pump suction lines date back many decades. Until his death (at age 84, in 1995), world-renowned pump expert Igor Karassik frequently corresponded with the writer and other pump users on pump-related subjects. We rarely pass up an opportunity to highlight some of his experience-based comments. Once, a pump user referred to Fig. 1 and noted that this was quite typical of illustrations found in many textbooks. In essence, Fig. 1 indicates that, with a suction line entering the pump in the horizontal plane, the eccentric reducer is placed with the flat at the top. Available texts often give no indication as to whether the pumpage c

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