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Old 03-02-2011, 10:22 AM   #1
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no methane gas or sewer smell of any sort coming out of any drains or vents


Perhaps somebody could shed some light on this "problem"... in my previous house any time you had an open drain with no trap on it you would instantly smell methane gas/sewer gas, and you could smell gas coming out of the vent on the roof, which I thought was normal, this house was built in 1960.... now on my new house that we bought 9 months ago, built in 1991, there is absolutely no smell or gas coming out of any open(non-trapped) drains or vents, even on the roof you can't smell anything at all... everything flows perfectly, in fact it seems everything drains much faster and better than the 1960 house.... so my question is why is there no sewer gas at all in my DWV system??? how is this possible, I thought the only preventer of gas was the traps on all the fixtures.

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Old 03-02-2011, 12:05 PM   #2
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no methane gas or sewer smell of any sort coming out of any drains or vents


Do you have a trap where your main stack leaves the house? You might have one in the yard.

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Old 03-02-2011, 03:07 PM   #3
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no methane gas or sewer smell of any sort coming out of any drains or vents


You may also have a check valve or backflow preventer in the line.
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Old 03-02-2011, 04:41 PM   #4
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no methane gas or sewer smell of any sort coming out of any drains or vents


yeah I'm guessing it must be some sort of backflow preventer that also prevents gas from travelling back up the line... that does indeed make sense to me... I guess I'll never know until I rent a camera and scope the lines
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Old 03-02-2011, 04:56 PM   #5
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no methane gas or sewer smell of any sort coming out of any drains or vents


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yeah I'm guessing it must be some sort of backflow preventer that also prevents gas from travelling back up the line... that does indeed make sense to me... I guess I'll never know until I rent a camera and scope the lines
...or you could hire a professional sewer lateral inspection company to do it
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Old 03-02-2011, 07:47 PM   #6
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no methane gas or sewer smell of any sort coming out of any drains or vents


ha true that, though the last time I had Mr. Rooter come in and scope a line and push through a clog(caused by charmin toilet paper that **** is like paper towel almost), we discovered there was a bow in the line, and it cost me around $850 Canadian :o

That left a bad pain in my wallet so after watching everything that was done I decided I better start learning this **** myself.

This was back in the 1960 house.

we never did fix the bow in the line, we just stopped using Charmin toilet paper and never had a problem again!
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Old 03-02-2011, 08:19 PM   #7
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no methane gas or sewer smell of any sort coming out of any drains or vents


A bow (belly) in the line, if pronounced enough, would act as a trap and keep sewer gas from coming back from the sewer or septic tank.

You can take a chance you do not have a bow (or that a bow may clog up at some unspecified future date if you did have one), or you could satisfy your curiosity now by having a drain specialist come in and video the line.
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Old 03-03-2011, 08:56 PM   #8
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no methane gas or sewer smell of any sort coming out of any drains or vents


I really do not see any problem here, and if it ain't broke.
I have seen this before in larger commercial building in new construction.
I have actually felt a vacuum effect in the new sewer line and I feel it is dependant on where your house is connected into the main sewer in comparison to manholes, which act as vents for main sewers. Your drain may be under a slight vacuum because of other waste passing through the main sewer past your connection, creating this vacuum. This is acting the same as in your house, and the reason for a venting system, which is to allow air into the system to prevent a large vacuum and allow the waste to flow.
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Old 03-03-2011, 09:10 PM   #9
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no methane gas or sewer smell of any sort coming out of any drains or vents


that is very interesting, didn't think of that one.
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Old 03-04-2011, 09:43 AM   #10
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no methane gas or sewer smell of any sort coming out of any drains or vents


Quote:
Originally Posted by Dougtheplumber View Post
I really do not see any problem here, and if it ain't broke.
I have seen this before in larger commercial building in new construction.
I have actually felt a vacuum effect in the new sewer line and I feel it is dependant on where your house is connected into the main sewer in comparison to manholes, which act as vents for main sewers. Your drain may be under a slight vacuum because of other waste passing through the main sewer past your connection, creating this vacuum. This is acting the same as in your house, and the reason for a venting system, which is to allow air into the system to prevent a large vacuum and allow the waste to flow.
I've seen this before also. In fact in some circumstances when the city is doing maintenance on their main, i.e. jetting, the pressure (vacuum) can at times suck the water out of the traps or toilet bowl on the lowest level of a private residence.

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