Don't rule out the use of flexible hoses; it's quite possible that the
particular ones you've been using aren't appropriate for the application
or weren't installed correctly. It's not uncommon to see short lengths of
rubberized hose used to reduce the transmission of vibrations from a pump
to the piping. It is perilous, however, to clamp a hose, directly to PVC
pipe. What you need is a hose barb cemented to the pipe that will provide
a "barbed" clamping surface. On boats, it's considered good practice (and
ABYC standard) to use two stainless-steel hose clamps side-by-side on each
connection below the waterline.
PVC's pretty soft, which makes it hard to clamp to without a hose barb.
On the other hand, the softness of PVC is such that the vibrations from a
small pump probably aren't worth the trouble of flexible couplings if it's
easier to make a direct connection. In either case, it's important to
make sure that the pump is supported and secured properly on it's own, not
by it's pipe connections, and to be sure that all PVC connections are
cleaned, primed, and bonded with the correct cement.
Good luck.
On Sat, 4 Dec 2010, marty sukey wrote:
> I posted something last week asking about water alarms now let me pester the
> group with a sump pump question. History.. The house is 11 years old with a
> sump pump in the basement. The pump discharges up and through the basement
> wall at a height of about 6 or 7 feet from the bottom of the pump crock. Then
> goes out to a ditch at the road. Pipe is 1-1/2 inch PVC. Total run of pipe is
> around 240 foot. The drop from where it leaves the house to where it
> discharges into the ditch is about 2 foot. The original pump took a dump about
> 3 years after we moved in naturally when we weren't home. The first pump was
> all hard plumbed in. When I replace the pump I used some rubber couplings,
> the kind with a couple of hose clamps on the ends to tie things together. Had
> an issue a while ago where one of the couplings separated from the pipe and
> the gusher flooded part of the basement. I figured I had not tightened the
> clamps sufficiently. Tightened everything up and checked them every couple of
> months to make sure they were tight. All was well until last week when one
> blew apart again. Water in the basement AGAIN. So OK I'm figuring I should
> not have used the rubber couplings. After putting the carpet back down today I
> move over the pump to take those rubber couplings out and hard plumb things
> back together.
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