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jjrbus 05-04-2013 08:14 AM

joining old PVC
 
I need to put a T in an old PVC pipe. 3/4" PVC about 15 years old, been buried underground. Yes I am sure it is scd 40 PVC.

I have washed the old pipe and plan on cleaning it with Acetone before I start, good idea?

I have fresh Oatey regular/clear cement and purple primer.

Are there any issues with welding old PVC to new PVC? Did a web search and came up with very little.

Is there a better way to do this ?

Thanks JIm

user1007 05-04-2013 08:35 AM

Just clean it. No need for the acetone. Then use your primer and than the PVC cement inside the t and on the pipe surface. Same exact procedure as with new PVC save for the cleaning step. It will still bond and should be fine unless it has been rocking around in sand or something that would have abraded the surface.

PVC exposed above ground can degrade from UV rays but you do not have this situation.

Do dig enough along the pipe run, and deep enough under where you are making your connection so you can manipulate the pipe some, twist the fitting before it cures and make the bond.

Alan 05-04-2013 11:37 AM

Make sure you deburr your cut edges. If you leave a burr it can push the glue out of the socket and cause a leak.

jjrbus 05-04-2013 12:41 PM

Thanks for the time and effort you have put into your responses, always appreciated. JIm

Javiles 05-04-2013 11:18 PM

PVC is petroleum based over time its looses its ability to weld, give the joints plenty of time to set before turning on the water.

jjrbus 05-05-2013 11:50 PM

Thanks for the input. I knew it was brittle and should be cut with a saw and not a PVC cutter, I recently learned this watching my neighbor.

The Oatey website said hold the joint for 15 sec and 1 hr cure time, 50% more for high humidity. I held the joints for 30 seconds and gave it 2 hours before testing. So far so good, but am going to leave it uncovered for a few days.
JIm

Alan 05-06-2013 08:58 AM

Quote:

Originally Posted by jjrbus (Post 1173514)
Thanks for the input. I knew it was brittle and should be cut with a saw and not a PVC cutter, I recently learned this watching my neighbor.

The Oatey website said hold the joint for 15 sec and 1 hr cure time, 50% more for high humidity. I held the joints for 30 seconds and gave it 2 hours before testing. So far so good, but am going to leave it uncovered for a few days.
JIm

2 hours is plenty, and the joint is only going to get stronger. Bury it. :thumbup:


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