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Old 11-26-2016, 08:31 PM   #1
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Adding a washing machine standpipe to a horizontal 3" main


I'm in the process of relocating my laundry appliances to the basement. The main 3" plumbing waste line of the entire house exits my home horizontally. I'd like to add a standpipe and trap for the washing machine to that horizontal run. I've mocked up the area in SketchUp to show how it'll look. Is the standpipe setup correct? I believe this current setup creates an S trap, which I think isn't correct. Any ideas would be very welcome.
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Old 11-27-2016, 07:21 AM   #2
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Re: Adding a washing machine standpipe to a horizontal 3" main


I am not a plumber, but I would have the tap line off of the main come up and out and have my trap above the entirety of the main. A small elbow on that line coming off the main would allow you to put in a P-trap.
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Old 11-27-2016, 10:33 AM   #3
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Re: Adding a washing machine standpipe to a horizontal 3" main


You also need to vent it.
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Old 11-28-2016, 10:34 AM   #4
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Re: Adding a washing machine standpipe to a horizontal 3" main


Ghost..... I'm not a plumber either...

Does that vent have to be on his toilet trap arm.... or can he put it on his main.....?
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Old 11-29-2016, 08:07 PM   #5
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Re: Adding a washing machine standpipe to a horizontal 3" main


The vent would have to be on the branch to the washer.
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Old 11-29-2016, 09:02 PM   #6
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Re: Adding a washing machine standpipe to a horizontal 3" main


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Originally Posted by MTN REMODEL LLC View Post
Ghost..... I'm not a plumber either...

Does that vent have to be on his toilet trap arm.... or can he put it on his main.....?
Quote:
Originally Posted by Ghostmaker View Post
The vent would have to be on the branch to the washer.
Ghost... Thanks but I'm slow and still confused.

The OP has that trap dumping into his main....(which I guess is a "main branch"????)

And I guess it does not have to be on a trap arm before it enters a branch or main branch line...????

TIA
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Old 11-29-2016, 09:24 PM   #7
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Re: Adding a washing machine standpipe to a horizontal 3" main


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Originally Posted by MTN REMODEL LLC View Post
Ghost... Thanks but I'm slow and still confused.

The OP has that trap dumping into his main....(which I guess is a "main branch"????)

And I guess it does not have to be on a trap arm before it enters a branch or main branch line...????

TIA
The wye in his main building drain creates the branch line.

A trap arm is the length of pipe between the trap and it's vent- every trap needs a vent and there are several ways to vent.

A section of drain between the vent and the wye connecting to the building drain is the branch
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Old 11-29-2016, 10:01 PM   #8
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Re: Adding a washing machine standpipe to a horizontal 3" main


Quote:
Originally Posted by MTN REMODEL LLC View Post
Ghost..... I'm not a plumber either...

Does that vent have to be on his toilet trap arm.... or can he put it on his main.....?
Quote:
Originally Posted by Ghostmaker View Post
The vent would have to be on the branch to the washer.
Quote:
Originally Posted by MTN REMODEL LLC View Post
Ghost... Thanks but I'm slow and still confused.

The OP has that trap dumping into his main....(which I guess is a "main branch"????)

And I guess it does not have to be on a trap arm before it enters a branch or main branch line...????

TIA
Quote:
Originally Posted by TheEplumber View Post
The wye in his main building drain creates the branch line.

A trap arm is the length of pipe between the trap and it's vent- every trap needs a vent and there are several ways to vent.

A section of drain between the vent and the wye connecting to the building drain is the branch
E... Thanks.... but does that not simply mean that the vent has to be on the trap arm ..... (on one side and I guess you could say it is on the branch .... ie the other side of the vent) ????
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Old 11-29-2016, 11:01 PM   #9
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Re: Adding a washing machine standpipe to a horizontal 3" main


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E... Thanks.... but does that not simply mean that the vent has to be on the trap arm ..... (on one side and I guess you could say it is on the branch .... ie the other side of the vent) ????
It's not totally correct to say "the vent has to be on the trap arm" What if the drain is vertical such as a sink?

A trap arm is the portion of pipe between the trap weir and it's vent.
This might help-- http://ths.gardenweb.com/discussions...ms-illustrated
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Old 11-30-2016, 12:00 AM   #10
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Re: Adding a washing machine standpipe to a horizontal 3" main


Quote:
Originally Posted by TheEplumber View Post
It's not totally correct to say "the vent has to be on the trap arm" What if the drain is vertical such as a sink? ( I guess I would say its on the end of the trap arm.... but I get your point)

A trap arm is the portion of pipe between the trap weir and it's vent.
This might help-- http://ths.gardenweb.com/discussions...ms-illustrated
E... Thanks..... the reference was good and nomenclature can be somewhat exacting...

but one more quick definitional question.... does a "branch line" refer only to any horizontal run to the main (starting after the vent) or in the sink reference above, would the vertical drain be included as part of the branch line run.?

Best
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Old 11-30-2016, 06:49 AM   #11
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Re: Adding a washing machine standpipe to a horizontal 3" main


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Originally Posted by MTN REMODEL LLC View Post
E...
but one more quick definitional question.... does a "branch line" refer only to any horizontal run to the main (starting after the vent) or in the sink reference above, would the vertical drain be included as part of the branch line run.?

Best
UPC definition:
Horizontal Branch A drain pipe extending laterally
from a soil or waste stack or building drain with
or without vertical sections or branches, which
receives the discharge from one (1) or more fixture
drains and conducts it to the soil or waste stack or to
the building drain.
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Old 11-30-2016, 07:44 AM   #12
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Re: Adding a washing machine standpipe to a horizontal 3" main


I think it would be safe to state that "A drain line must be vented before it turns down". The maximum distance between the trap and the vent is determined by the pipe size.

Your set up must look more like this.


Unusual supply lines design. Normally red represents hot. What does the blue line represent? What is the device between the two stop valves?
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Old 11-30-2016, 09:35 AM   #13
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Re: Adding a washing machine standpipe to a horizontal 3" main


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Originally Posted by hkstroud View Post
I think it would be safe to state that "A drain line must be vented before it turns down". The maximum distance between the trap and the vent is determined by the pipe size.

Your set up must look more like this.


Unusual supply lines design. Normally red represents hot. What does the blue line represent? What is the device between the two stop valves?
HK....Thanks... Yep.... and for a layman, a simple good way to think in relation to normal venting.

Best
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