Raucina
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I thought I knew a bit about pumps, but I am stumped. Well water is fed to a 3000 gallon tank, then feeds to a distribution building via 2" pvc pipe. No filters or restrictions in feed line outside of a valve and checkvalve. A Myers
[8stage?] horizontal booster pump, 1hp then feeds a standard pressure tank. I also have 2 backup pumps at 3/4 hp with about 6 stages that can be put in service if needed. Typical pump switch pressure setting is 60-80 psi.
There is 6psi at the pump inlet from the elevation rise of the storage tank.
The problem is that the pressure boost on the 8 stage unit rises to 50 psi, then very reliably hesitates and drops to 48 psi where it stays "forever", probably until the water would boil in the pump. Ok, so I popped in the smaller pump and it stops boosting at 62 psi and drops to 60 where it stays.
Is this cavitation? Why at different psi's on each pump? I have searched for suction leaks and cannot find any. This same set up worked reliably for years- cant think of any new elements in the system. Pumps are not very old and the water is very clean. Any ideas appreciated!
[8stage?] horizontal booster pump, 1hp then feeds a standard pressure tank. I also have 2 backup pumps at 3/4 hp with about 6 stages that can be put in service if needed. Typical pump switch pressure setting is 60-80 psi.
There is 6psi at the pump inlet from the elevation rise of the storage tank.
The problem is that the pressure boost on the 8 stage unit rises to 50 psi, then very reliably hesitates and drops to 48 psi where it stays "forever", probably until the water would boil in the pump. Ok, so I popped in the smaller pump and it stops boosting at 62 psi and drops to 60 where it stays.
Is this cavitation? Why at different psi's on each pump? I have searched for suction leaks and cannot find any. This same set up worked reliably for years- cant think of any new elements in the system. Pumps are not very old and the water is very clean. Any ideas appreciated!