Ask Experts Questions for FREE Help !
Ask
    frankds's Avatar
    frankds Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Aug 4, 2008, 09:44 PM
    Miniuium slope for a buried soil pipe
    What is the minimium slope for each one foot of length of a buried soil pipe? The soil pipe is 175 feet from the toilet to the sewer pit.
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #2

    Aug 4, 2008, 09:56 PM
    For 3" pipe it is 1/4" per foot. For 4" pipe it is 1/8" per foot.

    Therefore, in your case, it will be: about 44" of overall slope for 3" pipe and 22" of slope for 4" pipe. Plus, you have to add the depth of your toilet 90. You measure from top of that 90 forward...
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
    Ultra Member
    		  
    #3

    Aug 5, 2008, 10:04 AM
    The proper slope for drain and waste piping is 1/4" per foot. At this rate the water has sufficient scouring capability to help keep the drain lines clear. Piping 4" and above can be sloped at 1/8" if you don't have sufficient depth to run 1/4". Avoid putting too much slope on the piping if you have a lot of turns as the water will tend to run away from solids, Thanks.

    John
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Aug 6, 2008, 06:22 AM
    Hey Frank,
    you have to add the depth of your toilet 90. You measure from top of that 90 forward...
    We figure the fall of our sewer pipe from the foundation clean out to the sewers terminal and not from any fixture in the house. That slope's already been determined by the rough in plumber. But the answers are correct about fall. 1/4" per foot for 3" and under and 1/8" for an 4" sewer line. Good luck, Tom
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #5

    Aug 6, 2008, 06:27 AM
    Tom, he doesn't specify whether he is installing new fixture or replacing existing sewer starting at the foundation. I added that detail for that reason. Ohterwise, some people don't take the depth of toilet 90 into consideration...
    jaclark's Avatar
    jaclark Posts: 1, Reputation: 1
    New Member
    		  
    #6

    Sep 29, 2011, 11:29 AM
    A sewer line has a fall of 1.5 feet. If the pipe slope is 0.28%, what is the length of the sewer in feet
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #7

    Sep 29, 2011, 11:41 AM
    Hello Jaclark, few things first:

    1. You are attaching your question to 3 1/2 year old thread. If you want to ask a question, start your own thread
    2. Your question is missing on more piece of information: size of sewer pipe
    3. This is not an apprentice school. If you have a plumbing problem or need help with on-going plumbing situation, you post your problem in detail and one of our Experts will help you.

    Besides: why are you asking ?

    Back to you. Milo
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #8

    Sep 29, 2011, 03:37 PM
    A sewer line has a fall of 1.5 feet. If the pipe slope is 0.28%,
    Say what??
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Locating under sea bed buried pipe [ 2 Answers ]

We must to survey an area 1 km x 300 m (bathy, scan side, sub bottom) water depth 50 m, vessel speed 1knot. It is possible that this small area to be intersected by an old buried metallic pipe 6 inch diameter (buried maximum 0.5-2 m in sand or mud). Scan side, sea bed classification and sub...

How to tap into buried 4" CI waste pipe? [ 4 Answers ]

Here's the situation: There is a 3" cast iron main stack in the house (built in 1969, in MD, code is IPC) that empties into a 4" CI (with cleanout) pipe that exits through the cinder-block foundation. The pipe comes out of the foundation 14" below grade on the outside. I have uncovered it, and...

Clay soil on slope [ 2 Answers ]

What would be the best ground cover for a clay soil slope?

Soil Stack Vent Pipe/Stench Pipe ( Smelly Drains ) [ 3 Answers ]

I have a downstairs toilet and upstairs toilet ,one above the other.. The soil/stench pipe connects upwards to above the Roof heaves and downward into the sewer... Coupled into the sewer also is a Gully trap drain to take sink and bath / shower wastes and from time to time , from that drain gully...

View more questions Search