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Expansion joint set too "expanded"

PCustoms

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Jul 23, 2011
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23,521
Location
VT
So I goofed....

Long story short I was in a rush and didn't dry fit my expansion joint after I glued the adjacent conduit. The joint is now expanded about 1" past the center mark.

It's going to shrink when it cools off. The pipe may settle (sweep is on virgin ground). It may heave when I get frost.

Leave it, or try to cut a section and fix?

Are standard couplings OK for schd 80?


The longer story: Should have waited until there was a second set of hands, was trying to glue a joint and realized conduit pushed back into house, so ran around to push it back. Didn't double check alignments and had just enough time to run back and twist a fitting before it set. When I was done that debacle I absent mindedly looked at the short piece I had to hold an LB during mockup, picked up the longer section of conduit I had prepped and cut an inch off because it looked long. Halfway into glueing I realized my error but was committed at that point.
 
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PCustoms

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Kinda hard reading your post what you needed.

Not sure why...

My understanding is an expansion joint should be installed at the mid point (factory mark). I messed up, the joint is now extended about 1" past the center mark.

Will it be OK, or should I fix it now?

I also asked if schedule 40 couplings are OK on schedule 80 pipe. Right now it's a single piece of 80, but to fix easily I'd need to add a 2nd section.

Jim suggested wait and see. But if it is an issue (overextends) after I pull wire, I need to pull the wire back out to cut and glue a new pipe in.
 

eejack

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May 18, 2021
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the garden state
Schedule 40 couplings are fine with schedule 80 for your application.

I suspect you will be fine with the expansion where it is, but if the stress of not knowing is greater than the effort of adding a couple of couplings and a short piece of conduit...then make the change.
 

kaffine

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Dec 13, 2009
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Henderson, NV
How much travel does it have? You said it is an inch past center if it only has 1.5 inches of travel then I would fix it now.

Can you lift the pipe in the ground up just a bit and support well so it doesn't settle?
 
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PCustoms

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Joined
Jul 23, 2011
Messages
23,521
Location
VT
How much travel does it have? You said it is an inch past center if it only has 1.5 inches of travel then I would fix it now.

Can you lift the pipe in the ground up just a bit and support well so it doesn't settle?
It's got 4-5” additional travel before it comes apart.

The horizontal run/bottom of elbow is on undisturbed gravel. Not expecting much settling.
 
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