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Water lines underground, fittings question

 
pollinator
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What kind of pipe and fittings do you all use for running water lines to different areas of your yard?

Thank you for your time.
 
pollinator
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Regular old PVC, just make sure it is below the frost line.

If you are going to drain the line in the winter, then just regular garden hose, or irrigation poly lines or even pex piping. The less sunlight they get the better.
 
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black poly is probably most durable with brass or bronze barbed fittings secured with stainless clamps.
 
master pollinator
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Yes, PVC for me also. It has the wall strength to prevent being crushed.

If you plan to drain a shallow line for winter, try to arrange for the lowest point to have a drain fitting that you can get to. Then you just hit it with compressed air a couple of times and you're done.

Edit: Correction -- it's black polyethylene, not PVC. There are different grades; some are rated for potable water use.
 
pollinator
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PEM 32mm is what we run from the tap to the field it's 100m so a standard hose will not do. We also have to keep the water drinking quality so the pipe must be one that is certificated for drinking water. After that we run water through standard rubber hoses with brass fittings. It is dug down but only about a foot and a half that will keep it below our frost line 95% of the time, but we do not use it in winter so the pipe is empty at that time.
 
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I would use black poly. It can stand minor freezing without bursting, though I wouldn't recommend allowing it to freeze often. My father ran black poly about 500 feet from spring to house, including crossing under a ravine, 60 some years ago, and it still works.
 
gardener
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I would be careful with black poly if it is a pressure line. I've seen lots of blow outs. Even with the new thicker stuff, I've seen issues. I've had two stainless hose clamps on barb fittings start leaking. I don't know how many years they were buried, but it was a mess both times.
 
Glenn Herbert
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Yes, that is a consideration. I would use double SS clamps on any buried fittings, and minimize joints. For cold water use, you can get black poly with well over 100 psi rating.
 
Liv Smith
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I am not familiar at all with black poly pipe.

The lines we did so far, we used pex and the kind of fittings that are “push” type. We had two failures already, so I’m looking into different options. One that is readily available is “crimp” type fittings. I started using those. We’ll see how long they work.

One problem I’m having, due to poorly designed project, is that I have a “node” of pipes going into three directions that is under an area where we drive over it pretty often...
 
Jordan Holland
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Pex is good stuff, much better than the black poly. The thicker black poly is about as thick as the Pex, but I've seen it fail. I've never seen the Pex stuff rupture, and I've never seen a crimped joint fail. Driving over it is not good unless it's really deep. I definitely would make sure to never let a concrete truck drive over it. If possible, I would try to run it through a larger pipe for protection where you will drive.
 
Glenn Herbert
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Its proper name is high density polyethylene, or HDPE. It is quite cheap as piping goes, and can be gotten in rolls of 200 feet or more, depending on size. (Smaller sizes can be gotten in longer lengths.) There are at least two grades of it, standard and thicker (which can be used for suspending well pumps 150' deep or more and resisting the regular torque from starts and stops.)

HDPE pipe uses barbed fittings and stainless steel band clamps (ideally doubled for high-risk locations).

For use under driveways, I would bury it like electrical conduit, at least 18" deep if not more, and make sure there are no stones in contact with it. I second the idea of running it inside a larger pipe under heavy-traffic driveways.
 
Liv Smith
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Thank you, all, for your input. Valuable, as always.
 
pollinator
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In Australia we have poly pipe fittings made of plastic.
They are fantastic and I have never seen a broken one.
I have never seen one blow out, so investigate if you have them in North America.
They are very easy to use.

poly compression fittings
 
pollinator
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Schedule 100 HDPE, ie rated for 100psi, is pretty tough. I like it a lot more than PVC with glued joints. I use it on some buried runs, and lots of short-medium term surface applications.

Unfortunately, my supplier only carries it up to 1.5".

Also unfortunately, it is around twice as expensive as PVC...

So, when time is less short than money, and in larger sizes.. PVC, and all the annoying gluing, is the only way to fly.
 
steward
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PVC for all of my buried irrigation piping. 1/2" to 6" in diameter depending on what part of the system it is.

Steel for my buried culinary lines.

 
pollinator
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Ideal is to borrow or rent a fuser for hdpe and weld it.  Otherwise I would use the compression fittings for anything over an inch.  They are $$$ but I have never seen one fail.

Around here, pvc needs curves or zig zags for expansion if it's glued.  Otherwise the clay swells enough after a rain to pop glue joints.  I used slip joint pipe last time, but it had issues as well.
 
Skandi Rogers
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John C Daley wrote:In Australia we have poly pipe fittings made of plastic.
They are fantastic and I have never seen a broken one.
I have never seen one blow out, so investigate if you have them in North America.
They are very easy to use.

poly compression fittings



Those are the fittings we use as well, we've not had one break or come off yet.
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