Re-using PVC Pipe

[rp2813]

I've finally gotten around to fixing the irrigation system along the driveway that was badly damaged when an old juniper hedge was removed, and I'm going to reconfigure the PVC piping to allow for easier planting and help avoid damage in the future.  I've already replaced the damaged section of galvanized pipe up to the (new) valve (a visitor drove over the old one so I've relocated the new one out of harm's way), and will use PVC on the other side of the valve that won't be under constant pressure.  Existing sprinkler heads that spray in a strip pattern (they all survived) will be re-used.

 

I'd like to pull up and re-use the existing 3/4" PVC piping where possible.  This will require purchase of many new couplings and perhaps some other fittings, but I have concerns over whether the cement's bond will be compromised if I'm not using brand new clean pipe.  I tried cleaning up a section with some 409 and it didn't change anything.  Sanding lightly produced a rough surface, which may not be favorable for cementing either.

 

It's not like new PVC pipe would break the bank, but I'd prefer to keep the existing stuff out of the landfill.  I don't think it's recyclable. 

 

Any suggestions or experiences to share with regard to re-using this stuff?  If it's more trouble than it's worth, I won't hesitate to fire up the Jimmy and head to OSH for all new pipe.

 

Thanks,

 

Ralph

 

[retro-man]

I have reused many pieces of pvc in my irrigation system. Just as you did a light sanding primer and glue and back together the parts,no leaks and some have held for many years. Yes I did replace the joints and elbows with new ones. Wish I could do that on my body LOL.
Jon

 

[combo52]

REUSING PVC PIPE

Yes I agree pipe that was buried should still be very useable, like Jon said is just sand clean and reglue at the joints. The only pipe that I would be at all concerned about is pipe that was in full sun for many years as the ultraviolet sun light can weaken the plastic.

 

I have collected several hundred feet of used 1 and 1/2" 2" and 3" PVC PVC pipe that we will use when installing drain systems at the warehouse-museum. Like you I like to keep this stuff out of land fills and reduce the need for more imported oil.

 

[mattl]

Just curious, what type of PVC are you using?  My underground system uses the heavy black flexible PVC piping.  All my joints and connections are with the barb type fitting along with a stainless strap.  The trick I learned from the installers and I've used when adding or repairing a connection is to heat it with a propane or Mapp gas torch for a few seconds, push the fitting in and as it cools it forms a decent seal.   None of mine are glued.

 

[sudsmaster]

If the pipe is going to be exposed to the sun, I was told years ago to give it a coat of house paint and it will be protected. I did this for filter piping around the fish pond.

I would think that the sanding would improve the cement bond.

The other thing I've noticed is that on cold days the PVC pipe often doesn't shear evenly. It tends to crack irregularly instead. Not a problem in summer, though!

Last time I checked, though, PVC piping is fairly inexpensive, although if you have a lot to run then reusing old stuff makes sense.

 

[rp2813]

Thanks for the input.  I think I can re-use what I have.  It's been buried for at least 25 years, so exposure to sunlight is not an issue. 

 

This is the common white PVC pipe used for sprinkler systems.  It's my understanding that the black tubing with ribbed/barbed fittings is designed for drip irrigation systems.

 

 

 

[mattl]

My whole yard is done with the black stuff, 11 zones, various types of heads, but no drip...  Different system I guess.

 

 

 

[rp2813]

Matt, I do believe part of the outdoor piping that feeds this area is made up of the type of black pipe, ribbed fittings and clamps you're referring to.  I kind of like that system better, as it can be taken apart and modified or reconfigured without having to sacrifice cemented joints, and the pipe material is both pliable and durable; not subject to breakage like the white stuff.