Flexible drain pipe for wastewater (non-rigid)?

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dirk pitt
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Flexible drain pipe for wastewater (non-rigid)?




by dirk pitt » 05/04/11, 13:14

I am looking for a product or a trick that would allow me to use an old chimney flue in bushel bushels to bring down a sewage pipe on 2 floors.

unfortunately, this conduit is deflected by about 50cm in one place which makes me say that I have no chance to pass a rigid PVC of 100mm classic.

Despite my research on the net, I do not find a suitable product for sanitation that is partially flexible pipe.
I would have liked to find something of the style of the red ringed scabbards double wall which one finds for the electric cables; but suitable for wastewater.

if you have a tip, I'm interested.

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by Christophe » 05/04/11, 13:21

100mm, so it's for toilets?

If you can use less big, a good quality garden hose should be usable and easily connectable to rigid PVC 40mm ...

With us, all pipes (except wc) are 40mm

Why are the sheaths not suitable? Corrosion?
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by dirk pitt » 05/04/11, 13:39

it is indeed for WC + sink.
80mm minimum is therefore required.
the corrugated sheaths are sheaths and are not intended a priori to contain water (and materials ...) not to mention their resistance to products like bleach or other WC products.
maybe it could work ... for a while.
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by Forhorse » 05/04/11, 14:22

it exists ... in industrial equipment ... but then I dare not imagine the price.
Did you go to the plastic pipe specialists? (frans Bonhomme and PUM plastic for example)
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by dedeleco » 05/04/11, 14:37

The heated PVC becomes flexible (pile pile at the right temperature), not too hot (otherwise dangerous vapors and fire) and if you can keep it hot until the right position (thermal insulation or heating sheath around in the right place to remove after , with wire tie) it should be possible (if the deflected place is not too strong) by quickly threading it with force and pulling on a rope tied down on the pipe.
With this method adapted with a little imagination this should be possible.
Do not overheat because then it flattens and deforms too much, or even melts !!
By accepting a few hiccups on sacrificed pipes, and thinking about it, you should get there.
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by Forhorse » 05/04/11, 14:44

why not, it would be worth a try (for once dedicated to an applicable idea : Cheesy: )
Perhaps by inserting something inside the pipe which would prevent it from flattening but which could easily be removed later (inflated air chamber, etc ...)

The most delicate is actually heating ... but with a hint of resourcefulness, recuperation and imagination, there may be a way to find a solution.
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by dirk pitt » 05/04/11, 15:16

Thank you for your ideas.
here is what I thought to do:
PVC actually becomes quite flexible around 70 or 80 °.
I was thinking of using a flexible PEHD DN125 sheath type elec sheath which would serve as "casing".
then I will put down a hot air generator connected to this tube. HDPE is softened at a higher temperature.
I will thus have a hot guide sheath.
I plan to preheat my lengths of pvc pipe and introduce them from the top into the HDPE sheath. I have to make several lengths with collages between each length and I do not know too much the reaction of hot PVC bonding I have to try.

What do you think?
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by Alain G » 05/04/11, 15:18

Hi dirk pitt!

Here in Canada we have these very resistant 100mm flexible joints, you could put some paired with pipes of a length allowing you to pass the "S"!

http://www.homedepot.ca/webapp/wcs/stor ... PartNumber

The manufacturer:

http://www.fernco.com/plumbing/flexible-couplings


Note that it is 4 inches which gives 101.6 mm but there is no problem to install it on 100 mm


I use it to adapt the ABS on cast iron or copper!
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by Forhorse » 05/04/11, 16:17

We also find in France, but it is not so flexible because frankly short in length.
It is intended to make connections between pipes of different types (which cannot be glued together) but surely not to correct any misalignment or coaxiality.
I would frankly be afraid of the reliability of this thing in the long term with mechanical constraints related to this deviation ... even worse if it is necessary to put several!
In the absence of a flexible hose specially designed for this (see the suppliers mentioned above) PVC softened with hot air seems to me the best solution.

EDIT: apart from major works consisting of breaking the brick to access this naturally diverted part
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by dirk pitt » 05/04/11, 16:23

it seems to me that the pvc dn80 pipes for gutter evacuation are more flexible than the evac WC dn100
probably because less thick. that could be a solution too.
I'm going to give it a try.
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