PVC pipe repair update

[john in la]

Thanks for the help guys.

When I orginally started this job I was thinking of a fitting like Destroked 450 posted.
I have them in my pump house.
Great because you can take the pipe apart but problem is they are hard to use if you can not move the pipe.

I went to the hardware and looked at the slip joint fitting.
I agree with kencombs.
That fitting seems it would be hard to slid down in a wet mud hole before the glue set up.

So I got the compression fitting like Caryc posted a picture of.

When I got down to the pipe I found 2 pipes put together with a sleeve.
I do not know how but the pipes had slid apart breaking the glue joint on one side.
I sure hope this is the only one coming apart but do not understand how the pipe is moving.
It has to be settling some where along the line cause I know the pipe never shrunk a inch.

When I cut the bad piece out one compression fitting was not long enough so I cut some more out and used 2 compression fittings with a chunk of new pipe between them.
Maybe this will put some give in the pipe so other joints do not pull apart.
The pipe is 1 foot in the ground so I can not believe running a tractor or such over the line is moving the pipe.

 

[john in la]

Forgot the picture of the old fitting. You can see how much the pipe pulled out the joint.

 

[Stephen Newell]

The ground shifts and if the pipe isn't glued together very well it can pull the joints apart.

 

[Keith True]

The way that pulled shows it wasn't glued right in the first place.Cold weather,old glue,wrong glue,that glue is suppoed to melt the material in the connector,melt the material of the pipe,and become one.That glue is not supposed to lay on the surface like elmers glue.It is supposed to melt the plastic.Both pieces become one when glued right.Being wet while installing will do that too.Wet hands,high humidity,water in the ditch can do it.

 

[Check Break]

(quoted from post at 18:41:15 09/03/23) Forgot the picture of the old fitting. You can see how much the pipe pulled out the joint.


<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto162307.jpg>

It didn't pull out. That's what happens when you're shoving pipe together and you don't pay attention. It pushes back and you have to hold it in for a few seconds to get the glue to grab. The bigger the pipe, the longer the hold. That's Red Hot Blue Glue. If the rest of your line was assembled properly, you're in good shape. On another note, PVC will rise to the surface given enough time. I believe it's related to pressurization and depressurization, but then I'm not a pipe engineer.

 

[John Garner]

Thank you for following up.

 

[kcm.MN]

(quoted from post at 19:07:53 09/03/23) The way that pulled shows it wasn't glued right in the first place.Cold weather,old glue,wrong glue,that glue is suppoed to melt the material in the connector,melt the material of the pipe,and become one.That glue is not supposed to lay on the surface like elmers glue.It is supposed to melt the plastic.Both pieces become one when glued right.Being wet while installing will do that too.Wet hands,high humidity,water in the ditch can do it.

Keith's post is absolutely True! :wink:

Seriously though, Keith is correct. That pipe was not glued together properly. Any number of reasons could account for that. Let's just hope whoever glued that fitting did not make the same mistake elsewhere.

If you find any more water leaks, I would highly recommend running a new line of either black polyethylene or PEX, with the only connections being at each end.

 

[showcrop]

The purple color is cleaner. I have never seen glue with a color to it. It is apparent to me that the installer cleaned it but then put it together without putting the glue on. As Chuck posted you do have to hold them for 3-4 seconds to keep the pipe from pushing out of the fitting but it is going to push out at the absolute max only 1/4 inch. No where near the one and 1/4 in John's pic.

 

[johnlobb]

Also, the use of primer before the cement is absolutely necessary for a good strong proper joint. The fitting is very slightly tapered, so the joint does have to be held together for about a minute depending on the temperature. I used to be a rep for Oatey PVC cement...

 

[brentb]

I would use a dresser coupling to make a repair like that. One other thing that I do is open a valve on the end of the line when I am ready to turn the water back on after the repair.

 

[caterpillar guy]

Just one of the reasons I don't like PVC for buried jobs and use the black water line for them from the well to the house then you can use whatever you like from there. Big problem I see with Pex is they measure it on the OD instead of the ID like other pipes are. So a 1/2 inch is not a half inch it is a half inch on the ID.

 

[DoubleO7]

(reply to post at 10:56:57 09/04/23)

Big problem I see with Pex is they measure it on the OD instead of the ID like other pipes are. So a 1/2 inch is not a half inch it is a half inch on the ID.

What?

OD of PEX, copper (CTS) and CPVC pipe with the same size (CTS) are the same size.

1/2" pex is 5 /8" outside.

If they made it the same size as pvc pipe there would be dumb people connecting it with pvc fittings.