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Old 01-23-2013, 09:11 AM   #16
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Another vent question


Quote:
Originally Posted by hammerlane View Post
Fitting "A" looks like a 3x3x2 Wye and it is being used as the toilet vent. What is the problem you see with that??
Shouldn't the WYE fitting A be turned around?

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Old 01-23-2013, 09:17 AM   #17
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Another vent question


Quote:
Originally Posted by mikem201 View Post
Shouldn't the WYE fitting A be turned around?

What do you mean by turned around? Along which axis?
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Old 01-23-2013, 09:18 AM   #18
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Another vent question


i mean just turned around horizontally like it is now but with the ends switched around.
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Old 01-23-2013, 09:21 AM   #19
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Another vent question


Quote:
Originally Posted by mikem201 View Post
i mean just turned around horizontally like it is now but with the ends switched around.
No...the way it is now helps promote the air flow from the vent as the water drains past it. Imagine the air as the green line with the arrows.
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Another vent question-img_2701a.jpg  
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Old 01-23-2013, 09:23 AM   #20
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Another vent question


oh im sorry. The way I figure it was you want the gaseous air behind the waste to escape that is the reason for the vent. Was I wrong?
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Old 01-23-2013, 09:24 AM   #21
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Another vent question


Quote:
Originally Posted by hammerlane View Post
San T vs. Wye & 1/8
Help me understand your first image- it says code violation to me.

The center image is missing the left side of the pipes- that is the part that makes the combo wrong. As shown, the combo is fine.
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Old 01-23-2013, 09:29 AM   #22
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Another vent question


Quote:
Originally Posted by TheEplumber View Post
Help me understand your first image- it says code violation to me.

The center image is missing the left side of the pipes- that is the part that makes the combo wrong. As shown, the combo is fine.
first image...center image...Its says code violation....combo wrong...combo is fine. Cant make sense of what you are asking/saying.

Sorry
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Old 01-23-2013, 09:31 AM   #23
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Another vent question


posted images for reference
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Another vent question-when-20to-20use-20san-20t-20wye-201-208.jpg   Another vent question-proper-20placemet-20wye-20san-20t.jpg  

Last edited by hammerlane; 01-23-2013 at 09:33 AM.
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Old 01-23-2013, 09:34 AM   #24
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Another vent question


The purpose is to vent the sewer gases using the vent so what do you mean about allowing air from the vent back into the pipe?
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Old 01-23-2013, 09:35 AM   #25
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Another vent question


Quote:
Originally Posted by mikem201 View Post
The purpose is to vent the sewer gases using the vent so what do you mean about allowing air from the vent back into the pipe?
You need air behind water.
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Old 01-23-2013, 09:36 AM   #26
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Another vent question


So how do you know what position to place the vent? You have to vent the gases and bring air in, correct?
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Old 01-23-2013, 09:39 AM   #27
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Another vent question


When water is not flowing through a sewer pipe, the pipe is able to maintain neutral air pressure when compared to its surrounding atmosphere. When waste water moves through the pipe, however, it can act like a piston. The air downstream can become compressed. This creates positive pressure in the pipe. The air upstream can pull a vacuum, and this pulls back on the waste.
The positive pressure in the pipe needs to be released. Otherwise, it will push back against the waste stream. At the same time, there must be air flow behind the waste stream. If there is not, negative pressure will occur and this will result in suction. The volume of the waste that was discharged will determine how much pushing or suctioning takes place.
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Old 01-23-2013, 09:42 AM   #28
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Another vent question


Quote:
Originally Posted by hammerlane View Post
posted images for reference
Where did you get this images?
C- you can't lay a sant horizontal on a drain.

B- Both fittings are correct- unless you are showing trap arms- it doesn't say.

C & A are the same
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Old 01-23-2013, 09:42 AM   #29
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Another vent question


But im asking you need to vent and bring air in so in what way do you place the vent pipe?
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Old 01-23-2013, 09:44 AM   #30
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Another vent question


Quote:
Originally Posted by mikem201 View Post
But im asking you need to vent and bring air in so in what way do you place the vent pipe?
You really need to spend some time studying plumbing theory

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