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Old 04-25-2019, 08:38 PM   #1
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How to fit slightly misaligned 4" pvc pipes


Had 4" sump line clog up under the front yard. Dug it out and found the 4" SCH 30 PVC from the house was connected to the 4" SCH 40 PVC storm drain with a rubber fernco coupling. However, the pipes seem to have shifted vertically leaving a height difference of about 2".

I tried using a coupling and just inserting new pipe in slightly crooked, but couldn't get enough height. Then trying to use 2 45 fittings overcorrected by about 2". I can get them together with a shielded coupling, but it's obviously crooked, and to the point where I wouldn't feel good leaving it that way.

What's the best way to handle slightly misaligned 4" pvc pipes?
One thought was the 4x 90 fix, but that seems excessive?


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Old 04-25-2019, 09:15 PM   #2
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Re: How to fit slightly misaligned 4" pvc pipes


EDIT: whoops...must be tired. 4x 90 fix would be a terrible idea for a sump drain line
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Old 04-25-2019, 09:39 PM   #3
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Re: How to fit slightly misaligned 4" pvc pipes


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Originally Posted by dtbingle View Post
EDIT: whoops...must be tired. 4x 90 fix would be a terrible idea for a sump drain line
Several cuts 3/4 way thru will allow it to bend, Wrap that with rubber and apply 2 SS clamps.



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Old 04-25-2019, 10:44 PM   #4
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Re: How to fit slightly misaligned 4" pvc pipes


Suggest that you pick up a 4" long ninety, insert a short piece of pipe in it. Hold that along side of the existing short ninety and pipe. Chances are that you will be able to cut the vertical pipe below the existing short ninety and make horizontal pipe align with the other horizontal pipe. If so that will also let you connect the horizontal pipes with a coupling.
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Old 04-26-2019, 06:48 AM   #5
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Re: How to fit slightly misaligned 4" pvc pipes


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...but it's obviously crooked, and to the point where I wouldn't feel good leaving it that way.
Good for you.


You did an unplanned repair job.
Now you get to PLAN repiping that section altogether.
Dig out enough soil to expose more pipe.
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Old 04-26-2019, 07:59 AM   #6
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Re: How to fit slightly misaligned 4" pvc pipes


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Several cuts 3/4 way thru will allow it to bend
So will heating it up (heat gun), without the leakage risk of perforating it...is heating PVC drain pipe a no-no?
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Old 04-26-2019, 08:05 AM   #7
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Re: How to fit slightly misaligned 4" pvc pipes


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So will heating it up (heat gun), without the leakage risk of perforating it...is heating PVC drain pipe a no-no?
It is just a drain not a sewer and it isn't under pressure,
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Old 04-26-2019, 09:08 AM   #8
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Re: How to fit slightly misaligned 4" pvc pipes


All good ideas, thanks. The idea of cutting off the existing short 90 seems like my top solution assuming there's enough of a straight section underneath to cut and glue the new longer 90 too.

Might also see if 2x 22.5 degree fittings will give right height correction vs the 2x 45s.

hkstroud, you mentioned using an actual pvc coupling to tie in the horizontal run leading up to the house and the short 90 that goes go to storm drain line. If this line had shifted that much over time, my thought is that a shielded fernco coupling would allow a little flex in the joint vs. a hard glued pvc coupling just breaking off. In fact, in my second picture, it almost looks like that's exactly what happened to the broken end of the pipe. Thoughts?
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Old 04-26-2019, 09:54 AM   #9
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Re: How to fit slightly misaligned 4" pvc pipes


Slightly off-topic, but what do you all do as far as backfilling around this area? Sand? Whatever native soil that was dug up? Crushed stone?
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Old 04-26-2019, 10:16 AM   #10
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Re: How to fit slightly misaligned 4" pvc pipes


Sand, it makes for easy digging the next time, while it is best for protecting the pipe.
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Old 04-26-2019, 10:23 AM   #11
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Re: How to fit slightly misaligned 4" pvc pipes


Who know, some one makes a dog leg fitting.
https://www.google.ca/search?biw=102...=1556291651036
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Old 04-26-2019, 05:43 PM   #12
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Re: How to fit slightly misaligned 4" pvc pipes


Quote:
Thoughts?
Remember you ask.


I agree that the freezing and thawing of the ground is probably what broke the horizontal line. I assume that the vertical line is attached to the storm sewer and cannot move. The horizontal line does not appear to be buried very deeply. With each freeze the horizontal line is moved up slightly. With the thawing the line does not move back down because of the compaction of the soil. With the next freeze it moves upward a little more. How long this has been happening is hard to tell. However, it will continue until the horizontal line is either buried below the frost line or comes out of the ground.


Next thought is that a 4" line is far to big for a sump pump line. A 2" line would be quite sufficient.

I would excavate the horizontal line as far back as practical. Excavate around the vertical line deep enough to put on a 4x3 coupling and a 3" 90 degree elbow. Ream out the inside of the 4x3 coupling so the 3" line will pass through it completely. Install the 4x3 coupling on the vertical line with glue. Insert a length of 3" PVC through the 4x3 coupling as far as possible. Do not glue. The purpose of the 4x3 coupling is to keep the soil out only. Install a 3" ninety and pipe between it and the original 4" horizontal line with 3" PVC. Connect the two with another 4x3" coupling.
This will allow for the upward movement of each freezing.


Until you bury the horizontal line below the frost line or you stop the ground in Michigan from freezing, that line is going to continue to moving upward. This approach will allow it to do so.


Just my thoughts.


PS
There is such a thing as a inside pipe cutter for cutting that vertical line.
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Old 04-27-2019, 05:11 PM   #13
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Re: How to fit slightly misaligned 4" pvc pipes


hkstroud, that all makes sense and I completely agree with you.

However, I finished up the repair last night before reading your reply haha. Ended up cutting below that 45 coming from the storm sewer and extending to be the correct height, then connected the two ends together with a shielded coupling.



And as you mentioned, the 4" line is overkill for the sump. I could go all of the way back to the house rather easily, but don't think it's worth it to pull up good pipe. Also, this might worth out in my favor and allow us to attach an outlet for a planned french drain nearby without having to worry about capacity.



I have this posted in my other thread about sump pump lines, but this is how it was originally plumbed near the house.



The plan is to run new 3" Sch 40 under the driveway and tee up above grade. The 1.5" from the sump pump inside will come out and go into this 3" pipe with an air gap. Then the 3" line will go under the driveway and extend a foot or two into the front yard, and then make the transition into the existing 4" line down to the storm drain.
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Old 04-29-2019, 08:36 AM   #14
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Re: How to fit slightly misaligned 4" pvc pipes


Hopefully the clamps on that coupling are stainless!
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