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Sorry for the cryptic message. As you write, BB means between bearing. With double shaft deflection I mean a fisical double bending due to the weight and the radial forces acting on the shaft.

Shaft deflection shall be limited in each pump type to not have eccesive vibrations and/or internal wear due to contacts. But in more than one occasion I have found the reccomendation that double shaft deflection can not be acceptable in any case. I can understand this suggestion is reasonable...

I'm searching some article, book or simple suggestion helping me for a good selection between a reciprocating and a screw compressor when operating conditions are in the application range of both of them.