Question About Centerline Discharge Pumps

[EngineerWinnie]

I recently read somewhere that the geometry of centerline discharge pumps prevent air from being trapped in the volute. Is this true? How does centerline discharge prevent that?

 

[bimr]

The outlet is on the top, therefore, self venting.

Self-Venting, Top Centerline Discharge Casing with unobstructed suction prevents trapped air to maintain efficiency and flow.

 

[itdepends]

There's a compromise though- not a good idea if you're pumping settling slurries and you can't flush the pump before shutdown (the pump won't drain without an integrated drain in the bowl- which will block up...)

As a chem eng/metallurgist the first part of any answer I give starts with "It Depends"

 

[Artisi]

Neither will any other vertically discharging pump.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[itdepends]

True- I'm used to dealing with pumps that have tangential discharge. You can get some self venting by mounting them with a vertical discharge but they're commonly mounted side discharge for effective drainage (slurry pumps).

As a chem eng/metallurgist the first part of any answer I give starts with "It Depends"

 

[Artisi]

Correct, horizontal under-shot discharge is the only way a centrifugal pump can self-draining - as you said slurry pumps (usually).

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)