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Angle of the septic Line, 90 or 45?

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Angle of the septic Line, 90 or 45? Scott Townsend 08-25-2006
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Posted by jim on August 27, 2006, 9:16 pm
Yes when you will get sediment build up in city pipes 6 inch and bigger
but in 4 inch and smaller the flow of water will keep it at a minium ,
remember you have all your water coming down the pipe so it washes out
also most clogs happen because of roots not waste once again sorry
.yellowbirddog@hotmail.com wrote:
> jim wrote:
> > The minium is 1/2 inch per foot leaving the house to the tank or street
>
> Jim, just out of curiosity: Have you ever run across a situation where
> clogs were occurring due to excessive slope? I ask this because there
> are those in sewer maintence that have said that excessive slope has
> never been a problem with causing clogs. And the study I cited noted
> that sediment is less likely to form with increased slope.
>
> In common household sewage lines, you often have lines going from
> horizontal to vertical, which would cause the liquids to drop away
> pretty quickly, if anything would, but yet solids collecting in the
> region before the vertical drop and causing clogs doesn't seem to be an
> issue.


AppliancePartsPros.com, Inc.
Posted by Tony Hwang on August 27, 2006, 7:08 pm
yellowbirddog@hotmail.com wrote:
>>>>Seems like the 45/45 is the way to go, but I don't want my liquids to run
>>>>away from my solids. In keeping with the theory of a multi story house.
>>>>its
>>>>all 90/90 to get from floor to floor.
>>>>
>>>>So what should I do??
>>>>
>>>>Thanks,
>>>> Scott<-
>>>
>
> There is such a thing as minimum slopes for sewage lines, but not a
> maximum slope. The more slope, the better. The liquids running away
> from solids and causing clogs theory is a myth. High flow velocity is
> good. See this:
>
> http://tinyurl.com/kz2gj
>
Hi,
Make sense. Think about highrise commercial buildings.

Posted by jim on August 27, 2006, 9:20 pm
The standard rule still applies 1/4 per foot also use ty s at stacks
not wye s so that as much can leave the pipe as possible
Tony Hwang wrote:
> yellowbirddog@hotmail.com wrote:
> >>>>Seems like the 45/45 is the way to go, but I don't want my liquids to run
> >>>>away from my solids. In keeping with the theory of a multi story house.
> >>>>its
> >>>>all 90/90 to get from floor to floor.
> >>>>
> >>>>So what should I do??
> >>>>
> >>>>Thanks,
> >>>> Scott<-
> >>>
> >
> > There is such a thing as minimum slopes for sewage lines, but not a
> > maximum slope. The more slope, the better. The liquids running away
> > from solids and causing clogs theory is a myth. High flow velocity is
> > good. See this:
> >
> > http://tinyurl.com/kz2gj
> >
> Hi,
> Make sense. Think about highrise commercial buildings.


Posted by on August 28, 2006, 6:56 pm

Scott Townsend wrote:
> I'd have Cleanouts at either ends of the 90.
>
> Is that the only reason? What about the flow of the liquid getting away
> from the Solid? Am I too worried about it?
>

In hopes of putting this myth to rest once and for all, I found another
article specifically on the subject from Plumbing & Mechanical
Magazine. Here's an excerpt from a Google cache of the article:

***
Lessons Learned

One of my favorite stories about George occurred at a Plumbing
Exposition. George was on the Board of Directors of the ASPE Research
Foundation. He helped set up a demonstration model for the show. The
model had four of these new fandagled 1.6-gpf water closets. There was
a 3-inch drain line in clear plastic pipe. (Installed by a UA
contractor, of course.) The model had different segments of pipe to
demonstrate different flow parameters. One section of pipe was pitched
about 3 inches per foot.

As the show was about to begin, George was speaking to a few of us
standing around. He looked at this steeply pitched pipe and said, "We
might have a problem with stoppages in this section of pipe. I'm afraid
the liquid will be running away from the solids." I just smiled.

As the demonstration began, they flushed carrots, beets and peas. When
the vegetables hit the steep section of pipe, they took off down the
pipe, flying at a high speed. George looked over at me and said, "Well,
I'll be. You knew that was going to happen, didn't you? You see, my
apprenticeship instructor always taught us that if you pitched the pipe
too much, the liquids would run away from the solids." I said to
George, "My plumbing instructor said the same thing, but my engineering
professor explained why this is a plumbing myth and would never
happen." For the next hour we spoke about engineering principles. Here
George was in his 70s learning new concepts so he could relay the
information to others.
***


Posted by =?iso-8859-15?Q?Tekkie=AE?= on August 28, 2006, 7:52 pm
posted for all of us...
I don't top post - see either inline or at bottom.

>
> Scott Townsend wrote:
> > I'd have Cleanouts at either ends of the 90.
> >
> > Is that the only reason? What about the flow of the liquid getting away
> > from the Solid? Am I too worried about it?
> >
>
> In hopes of putting this myth to rest once and for all, I found another
> article specifically on the subject from Plumbing & Mechanical
> Magazine. Here's an excerpt from a Google cache of the article:
>
> ***
> Lessons Learned
>
> One of my favorite stories about George occurred at a Plumbing
> Exposition. George was on the Board of Directors of the ASPE Research
> Foundation. He helped set up a demonstration model for the show. The
> model had four of these new fandagled 1.6-gpf water closets. There was
> a 3-inch drain line in clear plastic pipe. (Installed by a UA
> contractor, of course.) The model had different segments of pipe to
> demonstrate different flow parameters. One section of pipe was pitched
> about 3 inches per foot.
>
> As the show was about to begin, George was speaking to a few of us
> standing around. He looked at this steeply pitched pipe and said, "We
> might have a problem with stoppages in this section of pipe. I'm afraid
> the liquid will be running away from the solids." I just smiled.
>
> As the demonstration began, they flushed carrots, beets and peas. When
> the vegetables hit the steep section of pipe, they took off down the
> pipe, flying at a high speed. George looked over at me and said, "Well,
> I'll be. You knew that was going to happen, didn't you? You see, my
> apprenticeship instructor always taught us that if you pitched the pipe
> too much, the liquids would run away from the solids." I said to
> George, "My plumbing instructor said the same thing, but my engineering
> professor explained why this is a plumbing myth and would never
> happen." For the next hour we spoke about engineering principles. Here
> George was in his 70s learning new concepts so he could relay the
> information to others.
> ***
>
>
No shit!
--
Tekkie

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