Ahmed,
Youmay be able to fabricate straightening vanes and weld them into the suction. However the suction is probably cement lined. It sounds as is you are getting vortexing rather than cavitation. vortexing is where the pump entrains air whereas cavitation occurs when the suction pressure is reduced below the vapour pressure of the fluid.
If it is cavitation can you raise the level in the suction sump?
You can purchase from the Hydraulics Institute a guide on the design of pump stations.
One solution could be to fiut VSDs and run the pump slower provided that this doesnt compromise the process requirements.
Contact the pump vendor, there may be a different style of impeller that can be used.
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<tt>
Dear Forum Members<BR>
<BR>
My sea water pumps are cavitating!<BR>
Flow rate 2750 m3/hr each.<BR>
Delivery pressure 1.8 barg<BR>
Suction pipe 500 mm.<BR>
Pump inlet nozzle 400 mm.<BR>
<BR>
There is a lot of turbulence in the suction pit of each pump. The 500 mm<BR>
suction consists of a long radius bend.<BR>
Is there some thing I can modify in the suction to reduce the turbulence?<BR>
<BR>
Ahmed Vawda <BR>
Process Engineer <BR>
Al Khaleej Sugar - Dubai <BR>
<BR>
<BR>
<BR>
[Non-text portions of this message have been removed]<BR>
<BR>
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