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Old 04-08-2014, 07:34 AM   #1
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Changing out the stand pipe...


Need to change out the stand pipe for the washing machine and reroute to a washing machine outlet box.

It looks like the chrome stand pipe is lead-welded to the (galvanized?) elbow,

which is treaded to the nipple from the tee.


Changing out the stand pipe...-img_0557.jpg


The threaded close nipple from the tee seems to be rusted (the tee is also rusted). Is it still good to reuse and connect to an ABS female adapter? Or I'd need to attempt to change out the nipple also?


When connecting an ABS female adapter to a galvanized nipple, would Teflon tape be good enough for a leak-free hookup?

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Old 04-08-2014, 07:51 AM   #2
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Changing out the stand pipe...


Should be considering getting rid of all that old steel pipe not just that one line.
It's all going to leak at some point and closes upon the inside from rust.

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Old 04-08-2014, 10:03 AM   #3
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Changing out the stand pipe...


IMO, it would be easier to remove as much of the old galvanize pipe as possible and replace it with PVC. You're going to reroute it to a new washing machine outlet box anyway. You have it all opened up, now's the perfect time to do it. It wouldn't take that long to redo it. PVC is cheap and lasts a long time. We have excellent plumbers on this forum who can help you out if needed. Just a thought.

Stay tuned, the plumbers will be along shortly with more advice/suggestions for you. Thanks.

Last edited by jmon; 04-08-2014 at 10:51 AM.
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Old 04-08-2014, 12:10 PM   #4
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Changing out the stand pipe...


Thx--need the specific details to know exactly which joint, etc. to remove (and how).


The tee connects to the vent up to the roof and also down to the drain pipe under the concrete I believe. That's the part I need to figure out what to do.
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Old 04-08-2014, 07:01 PM   #5
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Changing out the stand pipe...


If you decids not to rip it all out, remove the nipple and use a ABS or a PVC male adapter. Plastic female adapters often will crack when a metal pipe is inserted.
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Old 04-08-2014, 11:29 PM   #6
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Changing out the stand pipe...


Quote:
Originally Posted by joemc3 View Post
Thx--need the specific details to know exactly which joint, etc. to remove (and how).


The tee connects to the vent up to the roof and also down to the drain pipe under the concrete I believe. That's the part I need to figure out what to do.
I can't see what's under the tee but I'd look at cutting the riser just below it.
Then use a shielded transition coupling to convert to ABS or PVC drain pipe- rough in the laundry per your local code.
Treat the vent pipe the same way- cutting it up high and transition to plastic with an approved shielded coupling.

As mentioned- it's best to remove as much cast iron or galvanized pipe as possible. It's lived it's life and will fail at some point.
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Old 04-09-2014, 01:02 PM   #7
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Changing out the stand pipe...


Here are two close-ups.

Changing out the stand pipe...-img_0564.jpg

Changing out the stand pipe...-img_0566.jpg


Cut the galvanized pipe from the bottom drain half way up and remove the tee, then use Proflex couplings to change out to ABS (leave the top galvanized vent untouched)?


Quote:
remove the nipple...
That close nipple seems a bit tricky to remove. If I were to do this, might as well cut out the tee cleanly and use Proflex coupling... .

Last edited by joemc3; 04-09-2014 at 01:06 PM.
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Old 04-09-2014, 02:57 PM   #8
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Changing out the stand pipe...


cut the drop down line elbow then unthread the that galvanized elbow into the riser...clean it up then PVC it out to the new location
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Old 04-09-2014, 06:44 PM   #9
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Changing out the stand pipe...


Quote:
Originally Posted by joemc3 View Post


Cut the galvanized pipe from the bottom drain half way up and remove the tee, then use Proflex couplings to change out to ABS (leave the top galvanized vent untouched)?




That close nipple seems a bit tricky to remove. If I were to do this, might as well cut out the tee cleanly and use Proflex coupling... .
That's what I'd do- you can remove/replace the gal. vent too if you want.

I don't think that nipple will come out...

If you really want to get industrious- you could remove the vertical line out of the cast iron hub at floor level, install a rubber doughnut into the hub and build ABS out from there. But sometime those hubs crack- then your screwed....
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Old 04-10-2014, 12:19 AM   #10
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Changing out the stand pipe...


I noticed the following:

The elbow out from the tee is 1.6" OD.
The vent pipe is 1.6" OD.
The chrome pipe is about 1.55" OD.

The outlet box I bought has an opening of 2.3", so it looks like it's meant for a 2" pipe size.


If I'm changing out to ABS, I wonder about the following:

Vent pipe to the roof: 1-1/4" ID ABS

1. Sanitary Tee : 1-1/4 or 1-1/2 for the output to the P-Trap?

2. P-Trap : 1-1/4", or 1-1/2" ABS?
What is the correct height of the P-Trap (any code requirement?)


3. Need a 2"->1.5" reducer going out from the outlet box?


OR,

do I need to change out everything to 2" pipe size? If so I wonder how to change out that bottom cast iron female adapter that comes out from the concrete base... .

Last edited by joemc3; 04-10-2014 at 02:26 AM.
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Old 04-10-2014, 08:14 AM   #11
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Changing out the stand pipe...


Today's code require's 2" or 3" drain line and 11/2" vent for a washer box.
To be compliant, you should install a laundry sink instead and discharge the washer into it.
The sink takes a 1.5" drain which is your current set up
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Old 04-10-2014, 08:43 PM   #12
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Changing out the stand pipe...


So just cut the chrome stand pipe short and have the laundry sink drain feed into it? Wonder how to couple those two... .

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