Connecting ductile iron pipe to plastic pipe

[DerbyRunner]

One of our employees wants to extend a ductile iron pipe to move some water to another part of our facility.

The existing pipe is ductile iron, running under a driveway. I think it is 10". We have some existing 8" plastic pipe (green color) that is left over from another job. Can the two different pipe types be joined, and if so, how do you do it?

 

[rgr33]

In general, green pipe color is sewer pipe, which is not meant to be pressurized.

Better check that out before committing to it.

 

[/pine]

One of our employees wants to extend a ductile iron pipe to move some water to another part of our facility.

The existing pipe is ductile iron, running under a driveway. I think it is 10". We have some existing 8" plastic pipe (green color) that is left over from another job. Can the two different pipe types be joined, and if so, how do you do it?

For gravity systems
Try an Internet search for "fernco pipe couplings 10 x 8"

 

[DerbyRunner]

For gravity systems Try an Internet search for "fernco pipe couplings 10 x 8"

I did that, thank you. It is for gravity/ditch water so it is not under pressure.

One thing I am confounded by is that the end of the ductile that needs to be connected to is the bell end. Those rubber couplings, I presume, are for the non-bell end?

 

[gary49]

Yes, Fernco bands are for the spigot, or straight end of the pipe not the hub end.

 

[jfh28]

cut the bell off leaving a straight end......keep in mind that you are reducing the size of the piping down stream.....what might fit in a 10" won't fit in an 8".......put some kind of a grid at the 10" entrance to filter out the big debris......your other option would be a small concrete distribution box like you would use in a septic field with the 10 going in one side and the 8 attaching on the other side......this would also give you a clean out port if you think clogging could be an issue.......Jack

 

[quicksandfarmer]

You can get a rubber donut by Fernco that goes in the bell end and fits over the plastic pipe. You glue it in with a special glue, Rector Seal is a brand.

 

[Tractor Seabee]

You can get a rubber donut by Fernco that goes in the bell end and fits over the plastic pipe. You glue it in with a special glue, Rector Seal is a brand.

I have used those donuts many times, never had to glue them. Soap heavily to get them in using a 2X board and a large hammer. Not sure they make on in 10" though. Ductile iron is not easy to saw when cutting off a bell. I would go the vendor that sells underground utility products. I would wager there is a simple solution. Ferguson and Fowler come to mind.

Ron

 

[gary49]

cut the bell off leaving a straight end......keep in mind that you are reducing the size of the piping down stream.....what might fit in a 10" won't fit in an 8".......put some kind of a grid at the 10" entrance to filter out the big debris......your other option would be a small concrete distribution box like you would use in a septic field with the 10 going in one side and the 8 attaching on the other side......this would also give you a clean out port if you think clogging could be an issue.......Jack

I like the idea of a box with a cover, maybe even a grate considering that it's a piping no-no to decrease pipe size going downstream. I'd be tempted to use the 10" pipe as a chase and run the 8" pipe thru it if you have enough pipe, then you wouldn't have to worry about joining the different sized pipes.

 

[DerbyRunner]

I like the idea of a box with a cover, maybe even a grate considering that it's a piping no-no to decrease pipe size going downstream. I'd be tempted to use the 10" pipe as a chase and run the 8" pipe thru it if you have enough pipe, then you wouldn't have to worry about joining the different sized pipes.

I am told an 8" pipe will handle the anticipated flow, and that it does upstream before the 10" ductile which is through a driveway. Ductile was put there due to heavy equipment that traverses through.

I will see if there is sufficient access and clearance to use the ductile as a chase for 8" pipe. Interesting idea. Thanks!