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Changing to heavier impeller

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I don't suspect much would change unless you're increasing the diameter. Trimming impellers is standard practice so changes in weight don't really affect anything provided you balance the impeller after trimming.
 
If the chamber is larger it will likely pump more fluid.
Then things depend on the head that the new one develops.
You may need more power, or something else may change.
Compare the pump curves.

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P.E. Metallurgy, consulting work welcomed
 
A very open ended question without any real resolution, it will depend on manufacturer, model, required duty etc. Plus the best option to ask the manufacturer.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
 
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