Clogged drain pipes

Re: Clogged drain pipes

PostBy: KLook On: Wed May 28, 2014 9:31 pm

I am going to jump back in about to much pitch. I have pipes pitched to much and they have never plugged since 1989. My present house has pipes that are pitched to much and I don't anticipate any problems. First of all, the house in Maine had ONLY one toilet in it as all other liquids went to a gray water system. If the water was going to "run" away and cause problems,(nothing following it) that would have been it.
Now, in my present house, everything goes into one pipe, and I will bet that any turds etc, that do not make it down with the flush will certainly go with the dishwasher or the washing machine. Those appliances put out high volumes of water and I am certain that turd didn't dry that much and become concrete overnight.
To little pitch, I would agree, I think the code is to little pitch. But I have seen hundreds of installs in old homes where the pipes went in the only way it would work and the sh!t did go down hill.
I have a plumbing buddy to, and he tells me he has never ever seen a pipe plug up that was over pitched. But that is the code. Sometimes the codes make no sense at all. Sometimes they save your life.

Kevin
KLook
 
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Re: Clogged drain pipes

PostBy: windyhill4.2 On: Wed May 28, 2014 9:39 pm

While i am no plumber, my understanding of pipe pitch is that too much pitch allows the water to exit too fast, which empties the trap allowing methane gas to come into the house. I never heard anything about the brown trout getting stranded with no water to swim to the pool.
windyhill4.2
 
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Re: Clogged drain pipes

PostBy: Rob R. On: Wed May 28, 2014 9:43 pm

I wouldn't know about the empty trap thing...the main vent stack in my house is connected to the chimney in the attic. Keeps the system under negative pressure. ;)
Rob R.
 
Stoker Coal Boiler: EFM DF520
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Re: Clogged drain pipes

PostBy: Lightning On: Wed May 28, 2014 9:52 pm

Rob R. wrote:I wouldn't know about the empty trap thing...the main vent stack in my house is connected to the chimney in the attic. Keeps the system under negative pressure. ;)


Yikes :lol: What happens in a draft reversal??
Lightning
 
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Re: Clogged drain pipes

PostBy: titleist1 On: Thu May 29, 2014 8:10 am

windyhill4.2 wrote:While i am no plumber, my understanding of pipe pitch is that too much pitch allows the water to exit too fast, which empties the trap allowing methane gas to come into the house. I never heard anything about the brown trout getting stranded with no water to swim to the pool.


Very true regarding the vent siphoning. There are required 'horizontal' run distances from a trap based on drain pipe size and also required vent sizing to keep this from happening.

Regarding pitch it should be noted that the fittings are molded so pipe that is seated properly has the 1/4" pitch. If a pipe comes out of a fitting with a lot more pitch than that you may not be seated properly and have a potential leak point.

As understand it the plumbing code only recently included a 'too much pitch' note and many places probably haven't started using the newest code...(and I can't give you a paragraph number, only going by what someone who recently went through union education classes told me at a trade show this past spring). It had only ever mentioned a minimum pitch before that. Side note...Anything over 45* is considered vertical. Also, as I have seen, the use of smooth wall plastic pipe (relative to older iron pipe) greatly reduces the supposed issue of water outrunning the brown trout causing problems. And as has already been mentioned, if it does happen the next wave of water will move the solids along nicely. It seems typical they introduce the code update when materials being used probably negate the need, but I suppose the panels that maintain the codes need something to do on their vacation conferences. I have never seen a white paper or plumbing research study done that confirms the theory of too much pitch.

I do know some cities require laterals entering mains from being too steep as they claim it interferes with the flow in the mains. But those requirements have nothing to do with solids building up in laterals.
titleist1
 
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Re: Clogged drain pipes

PostBy: NWBuilder On: Thu May 29, 2014 8:23 am

No they don't wash their hair in the sink but they do brush it over the sink and chances are some gets washed down. I may look into a spa style shower head but I don't think that has much to do with it. I think they take tepid showers and not really hot showers which is more of the issue.
NWBuilder
 
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Re: Clogged drain pipes

PostBy: Rob R. On: Sun Jun 01, 2014 8:43 pm

If the sink drains are clogging just from incidental hair, something else is going on.

Do you have hard water? Have you ever had the water tested?
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy