|
Posted by Tony Hwang on August 28, 2006, 9:12 pm
yellowbirddog@hotmail.com wrote:
> 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.
> ***
>
Hmmm,
Demonstrated law of gravity?
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap