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Old 06-18-2016, 08:24 PM   #1
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Default Combination waste and vent

For those of you do restaurants, commercial kitchens or supermarkets where there are multiple floor sinks and floor drains, do you ever install your waste using a combination and waste and vent layout?
I'm amazed that even on engineered projects they don't avail themselves of the option of using a code compliant combination waste and vent design.
Fortunately, most AHJ's in my area are open to such systems without requiring wet stamped drawings (as long as they are installed in a fashion that follows the language of the code).
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Old 06-18-2016, 09:10 PM   #2
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Yes , here in Texas we have the UPC and IPC so we install the CWV under the UPC and the CDV under the IPC. The city of Dallas even lets you install the CDV on grease waste when just about all other jurisdictions don't allow that. Definitely makes the topout go much quicker.
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Old 06-19-2016, 07:16 AM   #3
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For those of you do restaurants, commercial kitchens or supermarkets where there are multiple floor sinks and floor drains, do you ever install your waste using a combination and waste and vent layout?
I'm amazed that even on engineered projects they don't avail themselves of the option of using a code compliant combination waste and vent design.
Fortunately, most AHJ's in my area are open to such systems without requiring wet stamped drawings (as long as they are installed in a fashion that follows the language of the code).
probably because those engineers have no clue what wet venting is, but if they worked in the field they might pick up some knowledge...
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Old 06-19-2016, 12:13 PM   #4
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probably because those engineers have no clue what wet venting is, but if they worked in the field they might pick up some knowledge...
A combination waste and vent system is completely different than wet venting.
Combination waste and vent is over sizing the line up to the trap. Let's say it's a 2" trap, you would run a 3" line up to it. Theory is that the 2" trap will never allow enough water through it to fill the 3" line. The top of the 3" would act as a vent because it would never be full of water.
Wet venting still has a traditional vent going going up but you can run horizontal below the flood level because there is a sink washing it down.
Obviously there's more to it than my over simplified explanation but there are differences between wet venting and combination waste and vent systems.
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Old 06-19-2016, 03:30 PM   #5
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A combination waste and vent system is completely different than wet venting.
Combination waste and vent is over sizing the line up to the trap. Let's say it's a 2" trap, you would run a 3" line up to it. Theory is that the 2" trap will never allow enough water through it to fill the 3" line. The top of the 3" would act as a vent because it would never be full of water.
Wet venting still has a traditional vent going going up but you can run horizontal below the flood level because there is a sink washing it down.
Obviously there's more to it than my over simplified explanation but there are differences between wet venting and combination waste and vent systems.
Ah, gotcha..I would think the cost of the oversize piping and fittings it would be close to just venting or use a few common vents..the problem I see with that especially on mop and floor drains is all the junk that would go down would fill half the pipe solid and then you loose the vent..good in theory not in application..
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Old 06-21-2016, 06:13 AM   #6
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this is wet venting
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Old 06-21-2016, 06:43 AM   #7
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this is wet venting
that aint jack without an into and a disgrace of a name.
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Old 06-21-2016, 10:44 AM   #8
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They're called combi wv, btw.
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Old 06-21-2016, 11:10 AM   #9
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this is wet venting
Not a plumber here..
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Old 06-21-2016, 01:55 PM   #10
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Ah, gotcha..I would think the cost of the oversize piping and fittings it would be close to just venting or use a few common vents..the problem I see with that especially on mop and floor drains is all the junk that would go down would fill half the pipe solid and then you loose the vent..good in theory not in application..

HMMMMMMM, well the savings is in the fact you don't have to run a vent on every fixture so you save tons of money on the topout not mention in the rough.
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