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simple sump/centrifugal pump question

simple sump/centrifugal pump question

simple sump/centrifugal pump question

(OP)
i'm a beginner here and have a simple question:
is a sump pump a centrifugal pump?  
any help...thanks in advance.

RE: simple sump/centrifugal pump question

It depends on what you mean by sump pump.

Sump pumps that I know of in two different designs are of two types.

One type used is called a CP Pump. That is Control-Pneumatic pump. It is a plunger type pump that uses compressed air or gas for driving the plunger.

The second type used in another design is a submersible centrifugal pump.

Does this answer your questions?

RE: simple sump/centrifugal pump question

(OP)
mucour,
yes, that helps me out very much.  thank you.

RE: simple sump/centrifugal pump question

What about a vortex pump. Does that fall under centrifugals?

RE: simple sump/centrifugal pump question

sump pumps are vertical turbine type centrifugal pumps,

vortex pump as far as i can judge is centrifugal.

RE: simple sump/centrifugal pump question

A centrifugal pump consists of an impeller rotating within a casing.  Liquid directed into the center of the rotating impeller is picked up by the impeller vanes and accelerated to a high velocity by the rotation of the impeller and discharged by centrifugal force into the casing and out the discharge.  Thus the name centrifugal pump.  (Reference Cameron Hydraulic Data pg 1-4)

A vortex pump is centrifugal.  It works on the principle that the impeller will swirl the liquid.  These are used typically with a stringy or fibrous material to pass though the pumps without binding or clogging.  It may also be able to handle larger solids.  The efficiency of the vortex or recessed style pump is normally much lower than an enclosed impeller.  For example 40% vs 70% efficient.  

Another type pump is reciprocating positive displacement pumps.  A simple explanation is a piston moving back and forth with inlet check valves letting liquid in on one stroke and the liquid traveling out a discharge check valve on the other direction of the stroke.  Warren Rupp makes an air powered diaphragm pump which is an example of a recip pump.

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