Vent running horizontally below flood level of rim of fixtures

[samsam]

We have committed a mistake. And ran all vent pipe horizontally and combined it below flood rim level of fixtures. Our plumbing system comes below concrete foundation of building. We have noted that it doest computer with UPC requirements " each vent shall raise vertically to a point not less than 6 inches above flood rim level of each fixture before offsetting horizontally".
Please help me to find a solution for the completed vents can we provide clean outs for vents? Please help with a diagrammatic solution.

Thanks

 

[Jadnashua]

Essentially, a vent really isn't a vent unless it goes up from where the trap arm meets the drain line and that must occur within specified distances of the trap it is servicing. The whole idea of a vent is that it can provide an air path and break the siphon created by waste flowing past, and it can't do that when below the flood rim...it will end up with waste in it so air can't flow. Essentially, you've created parallel drainage paths, not vents.

If you intended to add a diagram or picture, it did not show up.

 

[Sponsor]

 

[hj]

The ONLY solution is to raise the vents up to the level of 42" above the floor OR 6" above the fixture flood level, whichever is HIGHER. It has NOTHING to do with putting cleanouts in the vents.

 

[Cool Blue Harley]

Although vent piping may be installed in a horizontal position, vent connections to the drainage piping they serve may not be connected horizontally. The "invert" (interior bottom surface of a pipe) of the vent connection must be above the centerline of the drainage piping to which it is connected. The objective here is to keep the vent opening above the flow of effluent.

The vent connection is always below the overflow rim of the fixture. Significant portions of the vent may have to be installed below the flood level rim of the fixture. For example, there may be a floor drain where the distance from a wall that might be used to place the drain's vent exceeds the trap arm distance. In this installation the vent would have to be placed in a horizontal position, below flood rim, until it could turn vertically in the wall.

To answer your question. The reason vents must not be combined until 6 inches above the highest fixture served is to ensure that if there is a stoppage and an overflow condition, the waste from one fixture will not flow into other fixtures via the vent.

 

[samsam]

Gentlemen thanks for your valuable replies. Now the question arises what is alternative option as now we have already ran horizontally Installed vents below flood rim level. Any solutions? Like can v provide clean outs for vents

 

[hj]

There are NO "alternative options" because it is a "functional" issue that cleanouts will NOT cure. It is like asking if there is some way to avoid gravity because your stairs are too short to reach the porch.

 

[Terry]

If you add the cleanouts, it at least gives you a place to clear them if they fill.
When the plumbing is running free, the vents will work fine. You have a problem if the line backs up from a blockage.

I'm guessing that this is a comleted groundwork with a concrete floor alreay poured over it.

In the future, you may want to look at the wet vented layouts that use fewer vertical vents and enable snaking from other fixtures to clear lines.

 

[samsam]

Thanks Mr. Terry for your valuable comments.
Please Can you provide a diagrammatic presentation for location of clean out for vents? What other factors shall be considered. Please help me to find a workable solution for installed vents.
Regards

 

[hj]

I know you do NOT LIKE what I am telling you, but there is NO "workable solution" for what you did. Cleanouts do NOT correct it or make it usable. King Saul also had a problem with prophets telling him things he did not want to hear.

 

[WJcandee]

Never mind. I'm staying out of this.

 

[Terry]

Never mind. I'm staying out of this.

That's being safe.

Can you post some pictures?

 

[Cool Blue Harley]

Samsam, please post some photos of the underslab piping. It would be useful to see the individual vents, vent connections and drainage piping.

 

[samsam]

C
Mr. Terry can you show a diagrammatic presentation for location and type of cleanouts for vents

 

[Jadnashua]

C
Mr. Terry can you show a diagrammatic presentation for location and type of cleanouts for vents

FWIW, vents normally have no need for cleanouts since when installed properly, they should only ever have air moving through them with the exception of maybe some condensation or precipitation from above (which is why they also require proper slope). A pipe is not a vent when it is in parallel with other drainage lines and is likely to end up with waste running in them.

 

[Sluggo]

The workable solution to a vent system that does not meet code is to redo it properly. You have no alternative, even if you don't want to hear that.