June 2018

Columns

Reliability: Consider today’s canned motor pumps

We often make the mistake of letting our equipment selection decisions be governed by old data, anecdotes and traditions.

Bloch, Heinz P., Hydrocarbon Processing Staff

We often make the mistake of letting our equipment selection decisions be governed by old data, anecdotes and traditions. To illustrate this point, recall what you may have been told about canned motor pumps 10 yr ago,1 and compare it to the facts that deserve consideration today. Today, in 2018, 14-stage horizontal canned motor pumps are in operation. One manufacturer calls it a tandem design; it incorporates seven impellers arranged on the left side of the shaft, and seven on the right side. We plan to show its cross-section in a tutorial presentation that deals with pumps for hydrofluoric (HF) acid services. The tutorial, which is scheduled for the 47th Turbomachinery and 34th Pump Sympo

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