On Tue, 04 Sep 2007 21:52:21 -0500, Mike wrote:

Home repair folks,

The plumber did a wonderful job installing our new sump pump and hung up
the DWV pipe with plastic J-hook hangers solidly to the basement ceiling
joists. When water flows thru the pipe, the whole floor vibrates and is
very noisy upstairs in the bedrooms. The pump itself is fairly quiet.
Just the pipe vibration is noisy.

Is there any such thing as a vibration damping pipe hanger? Maybe
something like a tailpipe hanger for a care, with a rubber section
between two clamps, only made for PVC pipe.

Any ideas?

Those tailpipe hangers for cars are just pieces of old tires. You can
get an old tire for free almost anywhere. Cut strips from the
sidewalls (not the steel belted tread). A saber saw will cut them.
Make the strips long enough to go from the joist around the pipe and
back to the joist. Screw the strip of tire to the joist with a washer
under the screw head. Drill a hole in the rubber strip just above the
pipe and put a bolt thru with washers on both ends. Put a nut on the
bolt and tighten. Use as many of these as there are plastic hangers.
Remove the plastic hangers and enjoy the quiet pump. Total cost, a
few screws, bolts nuts and washers, and maybe a saber saw blade.
Probably about the same price as a Big Mac, and much less fattening.

Gene