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Old 12-30-2012, 12:18 PM   #46
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Drain stack configuration


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Originally Posted by jklingel View Post
of note is the orientation of the wye and 1/8th bend in this picture. i assume that is because any condensate would then "go with the flow" as if the fitting were being used for draining. i would have installed it reversed for the air to flow up; learn something every day.

You would have installed the combo(circled in green) as shown below as opposed to its original orientation(shown circled in yellow)??

Shown in yellow does promote air flow behind the water. Air is not "flowing up" it is being drawn in.
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Last edited by hammerlane; 12-30-2012 at 12:50 PM.
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Old 12-30-2012, 03:32 PM   #47
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Drain stack configuration


hammer: yes, assuming the large pipe on the right is vent only. at the green circle, had i not been thinking, it would have made sense for air to rise out.... even though it does not need to for plumbing purposes, as you said. (that said, an old plumber told me that air gets pushed more than pulled, but i think the reality is both happen equally. if air is sitting in a pipe and water displaces it, the air has to go somewhere. if air is being pushed, somebody's gotta come in to replace it). i now see that the proper configuration of the fitting accounts for air flow and liquid flow, if liquid were in the pipe (like maybe condensate). bottom line, i will surely pay attention if/when i run into this. thanks.
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Old 12-30-2012, 03:45 PM   #48
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Drain stack configuration


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I used Both never had a problem as far a inspections or function.
Agreed- sort of. They look good inverted when venting
@ Hammerlane- if the vent fittings are 6" above flood rim- you could use non drainage pattern fittings- Google a "vent 90" for an example There is a saying- "air don't care"
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Old 12-30-2012, 06:51 PM   #49
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Drain stack configuration


Venting Is air equilibrium a state of rest or balance due to the equal action of opposing forces. what did i say about this thread going 4 pages
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Old 12-30-2012, 07:05 PM   #50
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Venting Is air equilibrium a state of rest or balance due to the equal action of opposing forces. what did i say about this thread going 4 pages
Now you realize I'm just a plumber, right? How am I supposed to understand that definition? Did you learn that in physics 101?
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Old 12-31-2012, 12:49 AM   #51
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Drain stack configuration


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Now you realize I'm just a plumber, right? How am I supposed to understand that definition? Did you learn that in physics 101?
That's from second semester, where he also learned Newton's other laws of plumbing, like (1) Payday is Friday (2) Stink flows downhill (amended in 1937 to read ".... at 1/4" per lineal foot, measured horizontally), and (3) Never wipe the snake on your T-shirt whilst you are retrieving it from a clogged toilet drain line. The Three Cardinal Rules of Plumbing.
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Old 12-31-2012, 01:13 AM   #52
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That's from second semester, where he also learned Newton's other laws of plumbing, like (1) Payday is Friday (2) Stink flows downhill (amended in 1937 to read ".... at 1/4" per lineal foot, measured horizontally), and (3) Never wipe the snake on your T-shirt whilst you are retrieving it from a clogged toilet drain line. The Three Cardinal Rules of Plumbing.
I missed 2nd semester, but for make up class i was taught- hot on the left and cold on the right and that plumbers shouldn't chew their fingernails
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Old 12-31-2012, 02:15 AM   #53
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Drain stack configuration


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... and that plumbers shouldn't chew their fingernails
if you have a kid who is a late thumb-sucker, i guess teaching him/her to plumb would cure that rather quickly.
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Old 12-31-2012, 10:36 AM   #54
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Drain stack configuration


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@ Hammerlane- if the vent fittings are 6" above flood rim- you could use non drainage pattern fittings


That statement is kind of infering that if you tie in below the flood level rim of the highest fixture connected to the stack it would be OK to use a sweep-fitting. Which is not correct. You cannot go horizontal until you are at least 6" above the flood level rim of tthe highest fixture.

And actually looking at this depiction, fitting #5 should be higher on the stack so as to be above the top of the washer standpipe making the horizontal section of pipe between fittings #4 and #5 above the flood level of the highest fixture. The highest fixture being the washer standpipe.

Possible this person was to cut the washer standpipe a little lower.
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Last edited by hammerlane; 12-31-2012 at 10:39 AM.
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Old 12-31-2012, 10:38 AM   #55
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Drain stack configuration


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Originally Posted by hammerlane View Post
You would have installed the combo(circled in green) as shown below as opposed to its original orientation(shown circled in yellow)??

Shown in yellow does promote air flow behind the water. Air is not "flowing up" it is being drawn in.
Well, Hammerlane, in looking at the photo, my circumstance will actually be slightly different. My washer drain line will connect into a y and 1/8" combo of the vanity drain positioned to the right of it. I would think that the S/Tee should remain oriented as I have in the sketch for waterflow.

This said, my concern is on the washer drain ventilation. Being that the vent will be to the right of it by about 5 ft or so. Wouldn't this present a ventilation problem at all? If so, I thought an AAV would be the best solution to my concern... Do you think by adding an AAV would throws things off?

Revision to the sketch include the followings:

1) Relocation of clean out ports
2) Correction of Washer Drain line size from 1/5" to 2"
3) Adjusted the sink drain height in sketch to illustrate closer to the real thing
4) Additional labling (i.e. 2"-to-1.5" reducer points, 3"-to-1.5" reducer points, clean out, etc.)

Otherwise, we are close to the end of the post (LOL @ javiles and E ). So, I must ask one other question:

"Are there any problems with the plumbing sketch that I have drawn?"

Thank you all. This truly has been an excellent discussion on everyone's part!
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Last edited by oodssoo; 12-31-2012 at 11:10 AM.
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Old 12-31-2012, 11:28 AM   #56
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Drain stack configuration


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Originally Posted by hammerlane View Post

That statement is kind of infering that if you tie in below the flood level rim of the highest fixture connected to the stack it would be OK to use a sweep-fitting. Which is not correct. You cannot go horizontal until you are at least 6" above the flood level rim of tthe highest fixture.

And actually looking at this depiction, fitting #5 should be higher on the stack so as to be above the top of the washer standpipe making the horizontal section of pipe between fittings #4 and #5 above the flood level of the highest fixture. The highest fixture being the washer standpipe.

Possible this person was to cut the washer standpipe a little lower.
That's not what I was inferring. You cannot tie vents together below the flood rim but you can- in certain cases(AHJ approval) run horizontal vents below the flood rim- then you need drainage fittings and follow drainage standards. Here's 2 examples: kitchen drain/vent centered under the window or a floor drain in a large area that exceeds trap arm length.
Once 6" above the flood rim you could pipe with sch.40 galvanized water pipe fittings if you wanted too and per UPC- you can lay the venting level- no need to grade it(I'm sure that will get a comment from someone)
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Old 12-31-2012, 11:35 AM   #57
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Revision to the sketch include the followings:

1) Relocation of clean out ports
2) Correction of Washer Drain line size from 1/5" to 2"
3) Adjusted the sink drain height in sketch to illustrate closer to the real thing
4) Additional labling (i.e. 2"-to-1.5" reducer points, 3"-to-1.5" reducer points, clean out, etc.)

Otherwise, we are close to the end of the post (LOL @ javiles and E ). So, I must ask one other question:

"Are there any problems with the plumbing sketch that I have drawn?"

Thank you all. This truly has been an excellent discussion on everyone's part!
You are redundant with the clean outs- remove the 2" horizontal cleanout.
You don't need to vent the drain stack- refer to my previous sketch
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Old 12-31-2012, 11:58 AM   #58
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but you can- in certain cases(AHJ approval) run horizontal vents below the flood rim- then you need drainage fittings and follow drainage standards. Here's 2 examples: kitchen drain/vent centered under the window or a floor drain in a large area that exceeds trap arm length.
Good point.
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Old 12-31-2012, 01:21 PM   #59
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GGGGGGEEEEEEEEE
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Old 12-31-2012, 01:24 PM   #60
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Under IPC re venting not required in this set up unless exceeding waste arm length fitting 3 10 4 and 5 not needed saved what 10 bucks vertical must be in 3" min. only on new not if re piping existing.
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Last edited by Javiles; 12-31-2012 at 01:35 PM.
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