4 inch PVC to 5 inch clay drain problem
#1
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4 inch PVC to 5 inch clay drain problem
Hi
I had some new pipework laid that involved a new 4 inch PVC pipe being connected to an old 5 inch clay pipe. From what I can tell the builder used the correct adapter ie something like this
http://www.toolstation.com/shop/Roof...+to+PVC/p63345
However when a CCTV drainage survey was carried out you could see a large lip that was causing water to hold.
Does anybody know why this has happened despite using the right piece of kit?
Thanks very much
I had some new pipework laid that involved a new 4 inch PVC pipe being connected to an old 5 inch clay pipe. From what I can tell the builder used the correct adapter ie something like this
http://www.toolstation.com/shop/Roof...+to+PVC/p63345
However when a CCTV drainage survey was carried out you could see a large lip that was causing water to hold.
Does anybody know why this has happened despite using the right piece of kit?
Thanks very much
#3
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Hi
I'm not sure I understand. The new drains are standard PVC 4 inch, the existing part of the drainage system is the old 5 inch clay pipe.
So at some point 4 inch needs to be joined to 5 inch doesn't it? And I'm not sure what you mean by redoing it in concrete.
Thanks
#5
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As an ex Dyno-rod engineer that don't look right..
If he had of used the connector you have linked then the centres of the pipes would be aligned...
I'd not be happy with that to be honest..
Alan...
If he had of used the connector you have linked then the centres of the pipes would be aligned...
I'd not be happy with that to be honest..
Alan...
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#8
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.
Did you see the connection once it was made? or the fitting used, When the drain was done?
Did you supply the fitting or did your builder?
I think they have used a LEVEL INVERT REDUCER (upside down)
I could be wrong, I agree with gueniss about it being incorrect...
As alcazar says the 4 to 5 inch reduction or flow could be the wrong way, i.e. Our homes have 4inch (mostly) and the further away from the property the bigger the pipe gets until its at the sewage plant...
Hope you get sorted fella..
Did you supply the fitting or did your builder?
I think they have used a LEVEL INVERT REDUCER (upside down)
I could be wrong, I agree with gueniss about it being incorrect...
As alcazar says the 4 to 5 inch reduction or flow could be the wrong way, i.e. Our homes have 4inch (mostly) and the further away from the property the bigger the pipe gets until its at the sewage plant...
Hope you get sorted fella..
Last edited by fez the plodder; 14 February 2017 at 10:12 PM. Reason: .
#11
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That old clay pipe would be 150mm ID, don't know when originally laid, but guessing could be Hepsleeve pipe. I'm not familiar with that type of connector but if it's holding water in that area then there must be a backfall maybe caused by settlement of the pipes at connector. I agree that the pipes seem to be misaligned somehow when looking at the CCTV.
In your photo of the pipes being laid, there appears to be no bedding under the pipes which should be pea gravel or similar (unless doing a concrete bed and surround for shallow pipes - not really applicable here I would have thought), this may have exacerbated the problem.
HTH
In your photo of the pipes being laid, there appears to be no bedding under the pipes which should be pea gravel or similar (unless doing a concrete bed and surround for shallow pipes - not really applicable here I would have thought), this may have exacerbated the problem.
HTH
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#15
Stainless actually needs an abundance of oxygen to retain its resistance to corrosion. I would have thought being buried in wet soil could be the worst place for it (stagnant conditions where bacteria use up the local oxygen), but as you say maybe it does last decades.
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Stainless actually needs an abundance of oxygen to retain its resistance to corrosion. I would have thought being buried in wet soil could be the worst place for it (stagnant conditions where bacteria use up the local oxygen), but as you say maybe it does last decades.
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You need to pack the 4" pipe up so if you did have any lip for any reason it would be at the top - looking at the photo the smaller pipe is set lower so the lip would appear on the bottom - get the builder back to do it properly.
#21
as mentioned earlier it needs filling around with pea shingle before back fill.
I reckon it was installed ok ish but over time the new installation section has sunk relative to the clay pipe and caused a lip.
dig it up and do it properly and don't do it when its as muddy as the pic
I reckon it was installed ok ish but over time the new installation section has sunk relative to the clay pipe and caused a lip.
dig it up and do it properly and don't do it when its as muddy as the pic
#23