Upward thrust on vertical pump 1

[eyec]

what would cause this? Motor thrust upward taking out the bearing. Would assume if anything it would thrust in the downward direction.

TIA

 

[Artisi]

sorry- correction to above - appears pump A doesn't have any problem

 

[dabluffrat]

Up thrust in vertical turbine pumps is seen momentarily at start up, then again when running to the right of BEP. The upward dynamic force in low specific speed pumps is significant enough to overcome the pressure difference, causing a net up thrust, starting at 120% of BEP.

Cameron
Union Pump Co.
Houston, Tx

 

[bk19702]

Here's the paper previously mentioned on this subject.

 

[Artisi]

Excellent article - thanks for posting

 

[eyec]

thanks to all for their responses.
turns out the problem was with the motor not the pump.
stray current caused the failure to the bearings and things went south from there.

Steven C
Senior Member
ThirdPartyInspections.com