Jet pump and turbine pump

[sunloco]

hi,buddies ,I am a chinese,In our manual there are not category to be called jet pump or turbine pump. so I don't know to understand this two kinds of pump clearly.

Do these two kinds of pumps still belong to centrifugal pumps ? or others ?

 

[JJPellin]

I will speak to the turbine pump and leave it for someone else to address jet pumps. We would usually use the term turbine pump to describe a vertical pump of a particular design. Some people call these “can pumps” since they are often installed in vertical cans. They are centrifugal pumps. They can be single stage or multi-stage. The motor driver can be at the surface with a line shaft going down to the bowl assembly at the bottom. Or, they can be installed with a submersible motor, especially in deep well services. The individual impellers are most commonly mixed flow (part way between axial flow and radial flow). Most of our vertical turbine pumps use enclosed impellers with wear rings. The impellers may have balance holes and wear rings on the back-side, but not always. Some of them use semi-open impellers that have a back wall but no front shroud. Hydraulically, these pumps are good for services with low suction head available. The depth of the can provides extra suction head to the first stage impeller. They can also be rerated by adding or removing stages easily to change the pressure delivered. In many cases, different bowl assemblies can be installed on a given pump head, so the pump can be drastically re-rated without changing the piping, foundation or can. The downsides to this configuration include the fact that the shaft bushings tend to be lubricated with the pump product. And the pumps can have problems with up-thrust at very high flow rates. I hope this helps.

 

[PUMPDESIGNER]

So called "turbine" pumps have two distintive features:
1 - concentric flow as opposed to a cutwater
2 - flow from each impeller goes through a diffuser, even if there is only one impeller.

Turbine pumps cover the entire range of specific speeds, low to high, (radial flow all the way up to axial flow).

Jet Pumps
Distinctive feature is that some discharge flow is sent back to a nozzle on the intake side of the impeller, thereby adding head to the total NPSH, thereby giving the pump additional ability to lift fluid or obtain fluid from low NPSH sources. The "jet nozzle" may be located at the pump, or further up the line inside the well.

Typically this type of pump is centrifugal, with a cutwater, horizontal or vertical.

PUMPDESIGNER

 

[sunloco]

thanks a lot to the above two guys