On 1/31/2011 11:18 AM, mike wrote:
On Jan 29, 10:37 am, wrote:
On 1/29/2011 11:08 AM, Bill wrote:



Sorry for the topic.... But I'm installing new ABS sewer pipe and as I
do this, I'm wondering how poop actually "flows" through various types
of sewer pipe?

At the store are sharp 4" 90 degree bends and also longer more gradual
90 degree bends. I should think the "poop" would go around a bend in a
pipe "easier" if it was a "wider" turn?

Which got me to thinking that they have those sewer cameras now. Maybe
someone made some videos of poop going through various sections of
sewer pipe? And you would be able to see "how it works"???
What works best?

Besides large pipe, proper venting, and the proper drop per foot for
the sewer pipe, perhaps some designs are better than others?

Anyway I searched google videos and could only find videos of sewer
pipe inspections and nothing being "flushed" during the video. Anyone
know where there would be a video of this?

And dumb question... Does poop "float" down the pipe in the "wash of
water" from the toilet flush? (I would think it would be "sticky",
would sink to the bottom, and would tend to get stuck?)

It is the slope of the pipe that determines how material move in it.
If memory serves me correct it's 1 in 50. At that slope solids and
liquids move together along the pipe at about the same rate. If you
have the wrong slope the solids and liquids will separate as they
move.

The steeper the slope, the higher the velocity, and the cleaner the
pipe:
http://www.pmmag.com/CDA/Archives/83...00f932a8c0____

There is only a minimum slope.

As I said in another post I built my own house. I was fortunate in
that the local building inspector was a good person to deal with. He
was also the local plumbing inspector (Small town). His only concern
is that things be done to code. He was a hard nose in that area so you
may as well do it right the first time otherwise you will do it right
the second or third time. I knew others that suffered his wrath and
were forced to do some major chances in their work and attitude. One
of my neighbours built at the same time I did. He was no more than a
semi skilled laborer that worked in the construction trade
(renovations not new construction). I remember him once telling the
inspector that the both the code and the inspector were wrong and that
the neighbor new more about building than the inspector. Guess who
lost that one.

The inspector gave me a few drawings that covered the plumbing code
and I believe the 50 to 1 slope was specified in those drawings, I
followed them to the letter and had no problem with him or the plumbing.

I'm a believer in Code Minimum. I built my house over code in a number
of areas. I remember the inspector commenting that if more people were
like me and made sure things were done right to begin with his life
would be a lot easier.

My main point to the OP was to get familiar with the code and follow
it. If his work passes inspection he has nothing to worry about.

One thing I recall doing that the code never mentioned was to clean
off all the little burrs that were left on the pipe by the saw. I
could see them being a problem by catching something and possibly
creating a small dam in the pipe.

LdB