We have a sewage pit at work (maybe 500+ gallons) and it has 2 zoeller pumps in it. Both are piped up to above the pit to 3" to a single 4" wye. From the 4" end it goes up maybe 8' and then a few turns till about 40-50' till it exits the building into a 6" pipe. This was just recently changed to this set up, previously it ran maybe 150-200' in the building before joining with our existing sewer pipe. Anyways, since we had this changed over the pipe has a huge amount of kickback after the pump turns off. The pumps turn on, suck everything out and then turn off, a second later there's a loud bang, the pipes rattle and shake. The first week we had this set up the wye broke and we had to have it repaired from this shaking. The plumber added extra bracing on the top, and tightened all previous connections. We added a board on the top of the vertical stack to try and cut it down but it's still loud and shaking violently. Is there anything else that we can do to this set up to cut down on the amount of shaking that's occurring? We need to fix it soon, otherwise something else is gonna crack. I should also mention that the way it was set up before, there wasn't as much shaking, but all the wye's that entered into the old pipe before it was cut off are all cracked because of the force.
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