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My sump pump recently went bad and while replacing it, I also decided to replace the plastic corrugated tubing that was connected to it.

When I turned on the new pump, the amount of noise it was making sounded like there was an elephant in the basement. Best I could tell, that noise came from the corrugated tubing getting into some resonating vibration. After wiggling things here and there, I removed the new tubing and put the old one back in and now the pump is as quiet as a mouse.

As far as I know, this is a standard corrugated tubing for use with sump pumps that I bought from the local hardware store. But it appears to be made of a slightly harder plastic than the old tubing and I think that is partially why vibration noise is so much higher.

Is there anything that can be done to eliminate the noise besides having to use really old tubing which I would like to replace at some point?

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natural frequency = sqrt(k/m) where k is the stiffness and m is mass. So if the old tubing wasn't vibrating, increasing the mass on the newer stiffer tubing should lower the natural frequency back down to where it was before. –  Doresoom Apr 11 '12 at 19:02

2 Answers 2

You might try insulating a section of the pipe with foam insulation.Then try to mount that to something solid like a section of 2x4.

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You can also try isolating the sump pump from the plastic pipe with a section of rubber pipe of the proper diameter; a hose clamp and some sealant on either side of a short length will absorb some vibration that would otherwise be transmitted directly from the pump housing into the pipe. –  KeithS Mar 13 '12 at 0:10

You could replace the corrugated tubing with smooth black plastic pipe in the same size as your corrugated pipe. It bends slightly, but you will also probably need a 90 degree elbow to make the turn from "up" to "out". Although it fits on the connectors pretty snugly, be sure to get hose clamps for all of the connections; it would be a bad day if one of the connections eventually came apart.

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