High pitch squeel from drip irrigation line
HELP Please: My drip irrigation line is producing a loud high pitch sound. I have a 3/4 inch PVC line that has Rainbird XBD-80 8 outlet manifolds located at 7 locations along the run of PVC pipe. Pressure flow at each manifold is controlled by a 30 psi pressure regulator. Of the 8 outlets in each manifold, I am using an average of 5 outlets per manifold. Water flow to the plant is through Rainbird 5 gph pressure compensating modules (emitters). As soon as the system turns on, the squeal noise starts and it is coming from the manifolds. I have tried cleaning the filters in each manifold and have replaced the emitters. Water flow is fine but the sound is driving me bonkers.
Any ideas on how to fix this problem?