February 2020

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Reliability: Consider successful pump redesigns: Start with a clean sheet of paper

You may recognize the “pre-owned” pump in FIG. 1 as an axially split, between-bearing, multistage model. Chances are that half of its impellers face right-to-left and half of them face left-to-right. In that case, there must be an internal seal or bushing that limits leakage flow from the pump’s higher- to lower-pressure sections. There must also be porting or piping that takes flow from the discharge of the lower-pressure section to the suction of the higher section.

Bloch, Heinz P., Hydrocarbon Processing Staff

You may recognize the “pre-owned” pump in Fig. 1 as an axially split, between-bearing, multistage model. Chances are that half of its impellers face right-to-left and half of them face left-to-right. In that case, there must be an internal seal or bushing that limits leakage flow from the pump’s higher- to lower-pressure sections. There must also be porting or piping that takes flow from the discharge of the lower-pressure section to the suction of the higher section. Fig. 1. An old multistage pump. The old pump rests in a pre-owned fluid machinery yard and likely costs about 50% of a new one. As a reasonable businessperson, the owner of this

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