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Old 02-23-2012, 08:11 PM   #1
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1/4 inch per foot equals ???


Hi everyone.

I know my 3 inch horizontal drain has got to be at a 1/4" per foot

My question is..

What would 1/4" per foot be equal to in degrees ?

I've looked on the internet for this answer and I havent had much luck. Your help is appreciated.
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Old 02-23-2012, 08:12 PM   #2
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1/4 inch per foot equals ???


It's extremely close to 2 degrees........
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Old 02-23-2012, 08:27 PM   #3
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1/4 inch per foot equals ???


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Originally Posted by jomama45 View Post
It's extremely close to 2 degrees........
I was going to start a thread about this...

I wanted to clarify the distinction between the "2%" usually referred to with longer runs and larger pipes vs the 1/4" P/LF usually referred to with shorter runs and smaller pipes.

eg: When I trench to re-route 70 linear feet of 4" main/waste pipe I'm told I can use 2% (70x12 x .02) or 16.8" because I will dearly need that 3/4" (vs 17.5").
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Old 02-23-2012, 08:32 PM   #4
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1/4 inch per foot equals ???


EDIT: After reading "Tarheel's" response, I realize I made a mistake. 1/4" per foot pitch equals 2%, NOT 2 degrees. I can't give you the exact answer off of the top of my head, but I'd say it's likely just under 1 degree.......

Hopefully someone else here can give you a better answer.
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Old 02-23-2012, 08:44 PM   #5
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1/4 inch per foot equals ???


One degree could be equal to any length depending on how far from the point of origin you are making a measurement. It is not normally a function of length.

One degree can be broken down into 60 minutes or 360 seconds.
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Old 02-23-2012, 09:04 PM   #6
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1/4 inch per foot equals ???


Quote:
Originally Posted by kevin705 View Post
Hi everyone.

I know my 3 inch horizontal drain has got to be at a 1/4" per foot

My question is..

What would 1/4" per foot be equal to in degrees ?

I've looked on the internet for this answer and I havent had much luck. Your help is appreciated.
Hi Kevin: works out to 1.2. It would be the inverse tangent of .25/12 but I just drew it out in DeltaCad and let it figure out the math
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Old 02-23-2012, 10:40 PM   #7
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1/4 inch per foot equals ???


Thanks for the answers.
If your curious , any levels that I can find find have an auto adjust for the degrees.
And for this length of pipe it'll be helpful to know what I can set it at.
Thanks Again.
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Old 02-23-2012, 11:00 PM   #8
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1/4 inch per foot equals ???


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Originally Posted by kevin705 View Post
And for this length of pipe it'll be helpful to know what I can set it at.
I don't know anything about this whiz-bang gizmo you have, but...

If Point "A" = X" (below some known grade level or such)...
then Point "B" 100 linear feet away MUST be 24" shallower than X.
(100 x 12" x .02)

For the 1/4" P/lf method... 100' x .25" per = 25" shallower.

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Old 02-23-2012, 11:18 PM   #9
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1/4 inch per foot equals ???


Quote:
Originally Posted by jschaben View Post
Hi Kevin: works out to 1.2. It would be the inverse tangent of .25/12 but I just drew it out in DeltaCad and let it figure out the math

To be a little more accurate :

1.193489423982035

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Old 02-24-2012, 07:27 AM   #10
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1/4 inch per foot equals ???


go to home depot and buy a husky plumbers level it has 1/8, 1/4, 3/8, rise marks on it just
make sure you use it right or your pipe will be going the wrong way

http://www.homedepot.com/Tools-Hardw...&storeId=10051
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Old 02-24-2012, 08:03 AM   #11
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1/4 inch per foot equals ???


Tape a shim (1" in this case) on one end of a 4' level.
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Old 02-24-2012, 08:09 AM   #12
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1/4 inch per foot equals ???


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Originally Posted by jaydevries View Post
go to home depot and buy a husky plumbers level it has 1/8, 1/4, 3/8, rise marks on it just
make sure you use it right or your pipe will be going the wrong way

http://www.homedepot.com/Tools-Hardw...&storeId=10051
Or, I've seen guys take a 4' level and tape a 1" block to the end of it.

edit: ^^^ he beat me.
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Old 02-24-2012, 06:49 PM   #13
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1/4 inch per foot equals ???


I have two different sizes of these levels. They convert from degrees, % and ?/12(for roof pitch). A little fun and you can convert anything you want.

http://www.sears.com/shc/s/search_10...el%20craftsman
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