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View Full Version : PVC pipe repair -- best option


Ira
07-12-2008, 04:23 PM
I have a cracked 45* fitting in a 1-1/2 inch sched 40 PVC line. The crack is near the middle of a main line that is about two hundred feet long, between the master valve and the last zone valve on the line, so when any zone is active, the pipe leaks. On the downstream side of the cracked fitting, it probably goes another ten feet before hitting another 45* fitting. On the upstream side there is an ell about five feet before the leak.

I don't want to use four ells because I don't want to dig up that much of my yard and I don't want the pressure drop. So my choices are a compression fitting, a telescoping fitting, or one or two "screw" unions (with O-rings). My best guess is that I should be able to do this with one union and a few glue fittings if I am really careful on the cuts.

The repair will be buried. Freezing is not an issue. I don't want to put in any stop blocks.

So, which would you use and what would be the layout? For example, if I use the telescoping or compression fitting, put it after the 45* (down stream) or before it? If I use one union, put it upstream or downstream of the 45*? Use two unions, one on each side of the 45* fitting?

On a side note, the leak occured yesterday. I had been running another zone for about thirty minutes while I was away from the house. When I got back. I noticed a "mound" in the yard about 15" high and four feet across. The yard is stratified between the original gumbo clay soil and about six inches of sandy clay fill dirt. Rather than "leak thru", the grass held together so the soil separated. When you walked on it, the hump moved around like a cheap water bed. I ended up popping it to get it to go back down. Really weird.

Thanks,
Ira

Wet_Boots
07-12-2008, 04:38 PM
You will use two unions, if you want to minimize digging.

Mike Leary
07-12-2008, 04:46 PM
When you walked on it, the hump moved around like a cheap water bed. I ended up popping it to get it to go back down. Really weird.


You wonder if it's going to blow sky high as you're looking at it!
Ditto Boots suggestion, measure carefully.

Ira
07-12-2008, 06:04 PM
I halfway expected water to shoot up a few feet when I popped it, but it only went up a few inches. The sod was put down less than two years ago. It came in 2' X 50' rolls, and had a plastic mesh on the back of it to keep it together while being unrolled. The mesh hasn't deteriorated so I guess that's why it held together.

I ran out of time today, so I just cut out the cracked fitting and capped both pipes. I can still run four of the five zones that way. The 45* fitting cracked right along the inside angle about half way around the fitting. When I made my first cut, the pipe didn't move like it was under stress, so I'm not sure why it cracked. The trench it was in was filled with sandy clay soil, so I don't think the dry ground shifted much.

So I should put a union on each side of the 45 fitting?

Thanks,
Ira

Mike Leary
07-12-2008, 06:28 PM
]You need a Ford "pack joint" for sch 40 pipe. Go to section "J".

fordmeterbox.com

Dirty Water
07-12-2008, 07:31 PM
Do your cuts right, and you can glue a 45 back in without any form of repair fitting.

Mike Leary
07-12-2008, 07:48 PM
Do your cuts right, and you can glue a 45 back in without any form of repair fitting.

:::yawn:::what's with the hurt my eyes political sig?

Dirty Water
07-12-2008, 09:03 PM
:::yawn:::what's with the hurt my eyes political sig?

I'm trying to annoy the guys in the politics section. I'm not even for barr.

Wet_Boots
07-12-2008, 09:28 PM
I'm trying to annoy the guys in the politics section. I'm not even for barr.I'm tellin' :nono:

FIMCO-MEISTER
07-12-2008, 11:06 PM
Do your cuts right, and you can glue a 45 back in without any form of repair fitting.

That 45 cracked because it was under stress. pipes no longer 45s now. 4 elbows only solution as far as I'm concerned. I bet the pipes shifted slightly after the cut so I bet they are even less of a 45 now. Try to 45 that back in and that next 45 down or up stream is going next. By the way did you know the original Astros were the Colt 45s? Used to see them for free on Dr. Pepper night if you had the right bottle cap.

Ira
07-13-2008, 01:10 AM
That 45 cracked because it was under stress. pipes no longer 45s now. 4 elbows only solution as far as I'm concerned. I bet the pipes shifted slightly after the cut so I bet they are even less of a 45 now. Try to 45 that back in and that next 45 down or up stream is going next. By the way did you know the original Astros were the Colt 45s? Used to see them for free on Dr. Pepper night if you had the right bottle cap.

Yeah. I saw them a few times back before the Dome, back when Bob Aspromonte was the local baseball hero. I guess I was maybe ten years old then. Remember that they first tried to grow real grass in the Dome? And the original roof was almost clear but they had to paint it to make it translucent.

Ira

AI Inc
07-13-2008, 06:46 AM
I'm tellin' :nono:

No need to , anyone with a brain figured it out after the first post it was attatched to.

Wet_Boots
07-13-2008, 11:13 AM
No need to , anyone with a brain figured it out after the first post it was attatched to.Reading the drivel over there makes me think some of the participants are from the brain-optional contingent.

irrig8r
07-13-2008, 12:18 PM
On a side note, the leak occured yesterday. I had been running another zone for about thirty minutes while I was away from the house. When I got back. I noticed a "mound" in the yard about 15" high and four feet across. The yard is stratified between the original gumbo clay soil and about six inches of sandy clay fill dirt. Rather than "leak thru", the grass held together so the soil separated. When you walked on it, the hump moved around like a cheap water bed. I ended up popping it to get it to go back down. Really weird.



That happened to me once in my parents backyard when I was about 11 or 12. It was a Sunday morning, and I went out in the yard and noticed this mound... I had no idea what was going on.. I poked it with my foot and it jiggled... the dog was barking at it... turned out to be the poly mainline that broke. (Back in 1970 before widespread PVC use here, it was either poly or galvanized)... I've encountered similar mounds in tight knit turf twice since.

WalkGood
07-14-2008, 01:14 AM
Ever see an asphalt parking lot lift up because of an irrigation line leak underneath it? It doesn't go down when you walk on it.

"IT'S A-LIVE"!

Dirty Water
07-14-2008, 01:22 AM
Ever see an asphalt parking lot lift up because of an irrigation line leak underneath it? It doesn't go down when you walk on it.

"IT'S A-LIVE"!

I must weigh a good bit more than you.

:laugh:

WalkGood
07-14-2008, 01:29 AM
This was a big BIG leak, and very strong asphalt! Actually it was a few layers of ashalt...... lot had been repaved a few times.

HooKooDooKu
07-14-2008, 11:53 AM
That happened to me once in my parents backyard when I was about 11 or 12. It was a Sunday morning, and I went out in the yard and noticed this mound... I had no idea what was going on.. I poked it with my foot and it jiggled... the dog was barking at it... turned out to be the poly mainline that broke. (Back in 1970 before widespread PVC use here, it was either poly or galvanized)... I've encountered similar mounds in tight knit turf twice since.

Happened in our neiborhood when I was a child too. The mainline leading to the house broke. The sod was at least 10 years old, so it held and they had a bulg in the yard you would walk on at least 10' in diameter.

Ira
07-15-2008, 09:56 AM
I ended up going with the "two sched 80 unions" solution. Did the repair yesterday afternoon. Put pressure on the line for about thirty minutes with no leaks. Ran the downstream zone for 45 minutes this morning. Still no leaks. I think I will keep pressure on the line most of the day, and if it continues to hold, I will cover it up this evening.

Thanks for the help.

Regards,
Ira