ALPHA DYNAMIC PUMPS ADM Serie Instalación, Operación Y Mantenimiento página 15

5. Solución de problemas

 











 
 
 
 

 
  
  
  
Possible cause
Wrong direction of rotation of the
motor
Insufficient suction head (NPSH)
Pump clogged
 Cavitation
 The pump sucks air
The suction pipe is blocked
Discharge pressure too high
Flow rate too high
 Liquid temperature too high
Wrong material of the o-ring for
the

liquid
The impeller seizes up
 Foreign objects in the liquid
Shut off valve closed on suction
side
Discharge pressure too low
14
Solution
Invert the direction of rotation
Increase NPSH available:
·Raise the suction head (positive head)
·Lower the pump
·Increase the diameter of the suction
pipe
·Make suction pipe short and straight
Clean the pump
Increase the NPSH available
Check that the joints on suction pipes
are tight
Check the valves and filters on the
suction line
Reduce the pressure increasing the
diameter of pipes and/or
reduce the number of valves or bends
Reduce the flow:
· partially close the discharge valve
· reduce the rotation speed
Cool the liquid
Mount o-ring s of different material
(contact us)
·Reduce the temperature
·Adjust the distance between the
impeller, the rear casing and the pump
head
Use a filter on the suction side
Check and open the valve
Increase the suction pressure:
Install an impeller with bigger diameter