4 pole versus 2 pole 4

[HomeMadeSin]

Back when I was handling contract orders for IDP, a lot of the specifications called out for 1800 rpm (4 pole) maximum speed. Inevitably, sales and purchasing always worked around that spec. for the sake of savings, but I was wondering if that has changed at all. Although the pump size would be larger for slower speeds (typically), the bearings, seals and such would last much longer bringing down the operating and maintenance costs.

Any thoughts?

 

[SteveKW]

I own and operate a small pump repair shop and know from experience that if all the pumps were 1800 RPM, the repair intervals, at the very least, would double!