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Old 04-09-2013, 11:32 AM   #1
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Double trap question


My washing machine drains into a utility sink and occasionally gets clogged and backs up (I'm using a lint catcher on the washing machine drainpipe). The 2" galvanized pipe that the sink drains into has a p-trap about 3-4 feet from the sink. The sink also has a p-trap. There is an open vent pipe between the 2 traps.

My question is, if I remove one of the traps would it be less likely to get clogged and back up like it does? If so, which trap should I remove?

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Old 04-09-2013, 01:07 PM   #2
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Double trap question


Got a picture?
A lot of your problum may be the old steel pipe.
At some point it is going to close up on the inside.

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Old 04-09-2013, 04:17 PM   #3
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Double trap question


What do you mean by open vent? do you mean it is open to your living area?

One trap needs to go and add an AAV vent for the laundry tub. Replace the pipe in Plastic.
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Old 04-09-2013, 11:59 PM   #4
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Double trap question


Here are a couple pics. The utility sink is on the other side of the wall. The vent pipe is open to a vented crawl space and has been rigged to accept the overflow tube from a hot water heater. The drain pipe exits through the foundation wall and (apparently) tees into the outside main sewer line.

If I add an AAV to the vent, any suggestions for the overflow tube?
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Last edited by Grebus; 04-10-2013 at 12:10 AM.
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Old 04-10-2013, 01:33 PM   #5
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Double trap question


Are you saying that severely bent piece of copper piping (going into what was possibly once a stand pipe for a washer) is coming from the TP valve on your water heater?
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Old 04-10-2013, 02:20 PM   #6
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Double trap question


The copper pipe is connected to what I understand to be the pressure relief valve on the water heater. Is that the TP valve?

You might be correct that what I've been calling the vent pipe was at one time the standpipe for the washer. There is a hole in the drywall behind the washer in the same area that may have been where the hose fed through. As long we've been in the house, the hose has drained into a utility sink.
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Old 04-10-2013, 05:47 PM   #7
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Double trap question


Wow thats an awesome example of country plumbing.
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Old 04-10-2013, 06:17 PM   #8
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Double trap question


If you want to clean up the piping mess- try this
Cut the 2" galv drain back as far as conveniently possible- this will eliminate the illegal running trap and stand pipe.
Now use a galv x plastic no-hub coupling and join 2" abs onto the galv. pipe and extend it to the sink- similar to existing layout.
This will make the sink trap a little lower so lengthen the sinks tailpiece too.
The T&P relief line from the water heater needs to be 3/4"- not 1/2 as it is now.
So upsize it and run through the wall and terminate it over the rim of the sink(use copper or CPVC) At no point can it run uphill

Support all drain lines well
Grade pipe at 1/4" per foot
Run a drain cable in the 2" to clean it while it's cut open.
Hope this helps
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Old 04-10-2013, 07:33 PM   #9
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That is the old pull top beer can. Those went out in the late 70's
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Old 04-10-2013, 09:34 PM   #10
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Thats a Runing trap very much against code. re pipe that section.
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Old 04-11-2013, 12:40 AM   #11
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Double trap question


Thanks for the replies. What about a vent for the new ABS drain line if I end up replacing the steel? Should it be similar to the existing standpipe and capped with an AAV or is there a better way to do it?
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Old 04-11-2013, 06:59 AM   #12
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After you remove the water heater temp & pressure valve piping it will only be the sink using that drain line, correct? In that case once you remove that stand pipe and 2nd trap, putting an AAV in for the sink should be all you need.
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Old 04-11-2013, 08:21 AM   #13
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Originally Posted by Grebus View Post
Thanks for the replies. What about a vent for the new ABS drain line if I end up replacing the steel? Should it be similar to the existing standpipe and capped with an AAV or is there a better way to do it?
You may already be vented downstream. What does the steel pipe tie into?
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Old 04-11-2013, 09:29 AM   #14
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Quote:
Originally Posted by mj12 View Post
That is the old pull top beer can. Those went out in the late 70's
That is not a beer can. Its a Mark I-A2 Moisture Collection Vessel. Formerly lunch for the guy that plumbed this house.
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Old 04-11-2013, 11:03 AM   #15
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Double trap question


Fetzer, yes the sink would be the only thing using this line. Eplumber, this line exits through the foundation about 4 feet past what's in the picture, and presumably ties into the main sewer line running along the side of the house. So I don't think there is any other vent.

I like the comments on the beer can. I've left it there along with the other odd items found in the crawl space of my 1959 house--a miniature bible tucked in between the floor joists, a chrome bicycle fender, a stop sign, etc. If we ever sell the house I will have to add a couple of weird things to the collection.

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