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Waste pipe sizes and joining ABS with copper

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Waste pipe sizes and joining ABS with copper sparkyguy442 11-26-2006
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Posted by on November 26, 2006, 8:54 pm
I want to add a shower in the bathroom of my office. This is a
commercial structure.

The available copper waste pipe, unlike other pipe compositions,
actually measures 2 inches in diameter. I see in the home improvement
center that the 2 inch ABS is larger than 2 inches.

I'm going to use ABS for the shower waste pipes. It looks like most
showers use 1-1/2 inch plumbing.

The sewer pipe coming out of the slab is cast iron, and a copper waste
pipe (from a utility sink nearby) Y's into it using a copper elbow. A 2
inch rubber union (the kind with hose-clamps) connects the copper elbow
to the cast iron Y. I could replace the copper elbow with a Y (copper?)
and run the ABS into that.

How can I mate the ABS to the copper pipe or Y? Are there adapters to
go from one material/size to another (ie, 2 inch copper to 1-1/2 inch
ABS)?

Other suggestions?

Thanks,
Dave


Posted by on November 26, 2006, 10:12 pm
well abs is kinda sucky so i would suggest PVC
but
there are 1-1/2 to 2 rubber union adaptors



>I want to add a shower in the bathroom of my office. This is a
> commercial structure.
>
> The available copper waste pipe, unlike other pipe compositions,
> actually measures 2 inches in diameter. I see in the home improvement
> center that the 2 inch ABS is larger than 2 inches.
>
> I'm going to use ABS for the shower waste pipes. It looks like most
> showers use 1-1/2 inch plumbing.
>
> The sewer pipe coming out of the slab is cast iron, and a copper waste
> pipe (from a utility sink nearby) Y's into it using a copper elbow. A 2
> inch rubber union (the kind with hose-clamps) connects the copper elbow
> to the cast iron Y. I could replace the copper elbow with a Y (copper?)
> and run the ABS into that.
>
> How can I mate the ABS to the copper pipe or Y? Are there adapters to
> go from one material/size to another (ie, 2 inch copper to 1-1/2 inch
> ABS)?
>
> Other suggestions?
>
> Thanks,
> Dave
>



Posted by on November 26, 2006, 10:23 pm
> well abs is kinda sucky so i would suggest PVC
> but there are 1-1/2 to 2 rubber union adaptors

-=-=-=-

I've learned that a 1-1/2 inch ABS pipe isn't really 1-1/2, but a 2
inch copper pipe is actually 2 inches. Will such an adapter fit both?
Is there such a thing as a "specialty" adapter for ABS to copper pipe,
since they seem to use different rulers for measurement? (c:

What's so bad about ABS?

Thanks,
Dave


Posted by on November 26, 2006, 11:50 pm
Just went and bought a 2 inch threaded male fitting (copper) and a Y
(ABS) and threaded female fitting (ABS). Will cut copper pipe and
solder male fitting and then thread into ABS female. Then glue the
female fitting to Y and away I go!

I already have 2 inch ABS pipe and fittings, so I thought I might do
the drain all in 2 inch. Any reason to not do this?

Thanks,
Dave


Posted by Wayne Whitney on November 27, 2006, 10:24 am

> Just went and bought a 2 inch threaded male fitting (copper) and a Y
> (ABS) and threaded female fitting (ABS).

It is a minor point, but I believe that when transitioning from
plastic to metal using threaded adapters, it is proper to to use a
female metal adapter and a male plastic adapter. The idea is that
since the metal is stronger than the plastic, if you overtighten it in
your configuration, you could split the female plastic fitting.

As to those who say PVC is better than ABS for DWV, I would like to
ask why. My understanding is that they are functionally equivalent,
and that ABS is somewhat less nasty to make, environmentally, so I
have been using ABS. It also seems easier to join, requiring no
primer.

Cheers, Wayne

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