I know positive displacement pumps deliver fixed flow with pressure affected by downstream piping system, but when we supply the suction of a screw rotary pump with a centrifugal pump in series arrangement, some doubt arises. What would be the effect of centrifugal discharge pressure injecting screw pump suction from the view of screw pump flow rate? By the way what is the minimum reasonable viscosity justifying the use of positive displacement pump?
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Ross Mackay Forum Moderator 93 Posts
Re: What are the limitations of centrifugal pumps?5 July 2011 at 1:29pmThe effect of running a centrifugal pump in series with a screw pump will depend on the various sizes of pumps and their flow rate as well as the viscosity of the liquid involved. In addition there is no minimum viscosity for running a centrifugal pump. The limitations depend on the flow rate and efficiency losses created by the viscosity of the liquid. You can't just identify a single number.