laying main waste line from house to septic tank
#1
09-25-10, 04:16 PM
laying main waste line from house to septic tank
I uncovered the main waste line from the house to the septic tank and found that it was crushed beneath some very large rocks. I've removed the rocks, cut the new pipe and and am ready to install, but want to know how to avoid having this happen again. Should I make a bed of gravel/stone for the new pipe to rest on and then cover it all with dirt? Is there a standard practice to follow? (I can't seem to find this info when reviewing "septic designs" and other such topics.) All advice appreciated!
#2
09-25-10, 08:39 PM
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Since you have it dug up, use sch40. Don't use the standard sewer pipe. The shc40 is much stronger. If a rock happens to work its way down there, it wont crush the pipe.
Bed the pipe in sand, and just cover it with dirt. Don't forget to install some clean-outs.
Travis
Bed the pipe in sand, and just cover it with dirt. Don't forget to install some clean-outs.
Travis
#3
09-26-10, 04:35 AM
Fortunately, sch40 is what they sell at the box store and that's what I've used. I already have it cut and in place, but need remove it in order to insert the donut/washer on the tank end. I'll fill the trench with sand as you suggest before replacing it. Thanks for your answer!
#4
09-26-10, 06:43 PM
I've run into another problem with connecting the main waste line to the septic tank. I used a fernco hub, but the opening to the tank is too irregular to get a snug fit and when I got it all in place and flushed a few times, water leaked from the connection to the tank. Would it work if I connected the end of the 4" pipe to a piece of 3" pipe so that the end could actually fit through the opening? I could then use a 3" hub, which I think would give a fairly tight seal (and of course, it would be buried). Is there a better solution?
#5
09-26-10, 08:49 PM
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Going from 4 to 3 at the tank will cause a place for a clog to start, and will be a problem down the road.
Put the 4" in the tank and seal around it with some cement.
The smoother the flow to the tank the better.
Put the 4" in the tank and seal around it with some cement.
The smoother the flow to the tank the better.
#6
09-27-10, 06:07 AM
Thanks again. That's what I'll do. When I pulled out the original pipe, a chunk of cement came with it and it looked like it had been used to seal the original gap. I thought the hub would be an improvement, but I guess not.
