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Some more clarification: https://www.eng-tips.com/viewthread.cfm?qid=89032

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Agreed. I haven’t said they’re wrong. I guess I was “thinking out loud” and figuring out when to use similarity and when to use affinity. Still not clear.

Equations 18-45, and 18-47 of MERM13 are valid when you reduce the diameter by trimming the impeller.  The relationships for changes within a family of geometrically similar pumps are different (I guess trimming the impeller makes the new pump not "geometrically similar" as the original)...

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There is no errata. I’ve been reporting to NCEES all the typos I’ve listed in this thread. I always get an email saying this [emphasis mine]. ”Thank you for your input. I will forward your questions and concerns to the committee responsible for creating and revising the PE Mechanical Exam...

Chicago Area late April snow spam

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