Vertical Turbine Pump Flow Inlet Velocity

[impeller1]

Hi guys,

I have a little problem. I'm trying to determine the inlet flow velocity of fluid to my pump. It's a 4 stage vertical turbine pump and its situated to one end of a well. Water flows into the well via a 24" diameter pipeline at an entrance velocity of approximately 8 ft/sec. Now the distance between the point of entry of the water and the pump's suction strainer is 10 feet. I wanted to know how do you determine the entrance velocity of the water be by the time it reaches the pump? Or is it almost negligible because of the distance involved? Its potable water with a specific gravity of 1.0 and the well is about 16 feet deep. Thanks for any help you may be able to offer.

 

[bimr]

You take the flow in cubic feet per second and divide by the cross sectional area of the "well" in square feet, to get the velocity in feet per second.

You might add to your description in that it is a little confusing. Are you talking about a pump station wet well?

 

[BigInch]

It might not be so simple, if turbulence is high, clearance between pump intake and walls is tight, or votex flow exists near the pump's suction.

Independent events are seldomly independent.

 

[Artisi]

Sure we could help if we knew what you were talking about.

Are you talking about pump situated in a sump with in turn is being supplied with water from a 24" pipe or is it something else.

A picture or sketch might go a long way in helping.

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.)

 

[bimr]

There are several papers out there that will assist you in sizing and developing the geometry of the lift station.

http://www.pump-zone.com/topics/pumps/pumps/design...

http://www.hatchmott.com/sites/dev.hatchmott.com/f...

http://85.185.231.196/mekanik/CD_3/pump handbook/intaks.pdf

 

[DubMac]

If you are really talking about inlet flow velocity to THE PUMP, then use the cross-sectional area of the bottom of the suction bell/case of the pump with BIMR's equation above.
As everyone is wondering; what are you really trying to get at here??