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Posted by EXT on July 30, 2007, 2:56 pm
Depending on the plumbing layout, there must be some water/sludge that
settles in the pipe leading to the bar sink, when upstairs facilities
particularly a toilet is flushed, enough pressure must be forcing this
sludge up and into the sink. The exterior vent that was connected to the
sink must have relieved the air pressure in the drain line and did it's job,
however, it sounds like the bar sink line is not draining well, and may be
allowing sewage to back up into its line causing the foul burps. The pipe
may need to be properly sloped towards your main drain line as the sludge
burps may end up clogging any new vent line and/or may continue to discharge
into the sink. Either that or your main sewer line is partially blocked
preventing the sewage from exiting in a steady flow, instead it may be
causing a backup into your sink. You may want to get a plumber out to check
for any blockage between your stack and the street sewer.
> djh wrote:
>
>> As a result of a remodeling job, the workers capped off a sewer pipe
>> that was once properly vented out the roof. They must not have
>> realized that I had a basement bar sink that is a part of same set of
>> drain pipes.
>>
>> My symptom was that the bar sink would no longer drain properly. This
>> made sense to me: there needs to be a vent so that air can be drawn in
>> to help the system drain.
>>
>> The OTHER symptom was sewage getting sucked through the bar sink P-
>> trap and belching up a foul sludge into the sink (I've remodeled my
>> bathrooms before and have had my head nearly in the toilet sewer hole
>> and yet I've NEVER smelled a smell like this). This was strange, this
>> part of the sewer circuit is not active and should not have material
>> in it.
>>
>> Does the vent also serve other purposes other that proper drainage?
>> Without it, does it create some sort of, I don't know, vacuum that
>> pulls sewage towards pipes that would otherwise be clear?
>>
>> Connecting this pipe back up with the vent in the roof would be a
>> considerable effort. So I put an indoor vent cap on the end of the
>> pipe. It supposedly lets air in but won't allow are to come out. I
>> don't get sludge backups anymore but I do get sewer smell. I take it
>> that these indoor vent caps don't work very well.
>>
>
> The "vent cap" is a mechanical vent that should not allow
> sewer gas to escape. But it may not be an adequate solution
> to the overall venting problem.
>
> Not nearly enough info. You would have to post a diagram
> of the complete venting/drainage layout.
>
> In the end, a proper roof vent may need to be installed.
>
> Jim
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