We have solved problem. We close the return lıne valve to %10 and the sound has cut. Our operation point has moved to right and we adjusted it. Thanks for your replies.
I have centrifugal pumps ın my company. We are usıng for transfer cooling tower water. these pumps are parallel. when we run only one pump ıt ıs creating noise like cavitation but we run other pump same time the noise is cut off. I dont want to run these pumps same time, one of must be spare...
