I have to replace about 20 feet of 1-inch black poly pipe between the
house and the five-zone manifold. About six feet of the pipe passes
under a paver brick walkway, which I don't want to disturb. The pipe is
about 6-8" below the soil, in Central New Jersey.

The first sprinkler company I called said the walkway must be disturbed,
and it would be up to me to make arrangements to remove and restore the
pavers. If I tackled that job myself, then I could easily replace the
pipe as well.

The second company said he would simply pass a 3/4" section of pipe
through the existing 1" pipe under the walkway, then use adapters to
transition back to 1 inch. (I don't know if meant to make the entire run
3/4" or just the part passing under the walkway. He's looking over the
job tomorrow.)

I asked about the reduced flow available through the 3/4" pipe. He said
that as long as I don't have more than five sprinkler heads on a zone, I
would be okay. My heads are by Hunter and there are only five per zone,
so it sounds okay.

Any other suggestions for not disturbing the walkway, or comments on
using 3/4" pipe?

Thanks,

Ray

On Sep 9, 6:16*am, Rebel1 wrote:
I have to replace about 20 feet of 1-inch black poly pipe between the
house and the five-zone manifold. About six feet of the pipe passes
under a paver brick walkway, which I don't want to disturb. The pipe is
about 6-8" below the soil, in Central New Jersey.

The first sprinkler company I called said the walkway must be disturbed,
and it would be up to me to make arrangements to remove and restore the
pavers. If I tackled that job myself, then I could easily replace the
pipe as well.

The second company said he would simply pass a 3/4" section of pipe
through the existing 1" pipe under the walkway, then use adapters to
transition back to 1 inch. (I don't know if meant to make the entire run
3/4" or just the part passing under the walkway. He's looking over the
job tomorrow.)

I asked about the reduced flow available through the 3/4" pipe. He said
that as long as I don't have more than five sprinkler heads on a zone, I
would be okay. My heads are by Hunter and there are only five per zone,
so it sounds okay.

Any other suggestions for not disturbing the walkway, or comments on
using 3/4" pipe?

Thanks,

Ray

When mine broke they just pulled a new section through, but I wasnt
there to see how it was done. Call companies till you get a real pro
that has equipment and knows how to do the job. Cutting the size of
the pipe will probably cut flow in half, I would not remove the
pavers since they will never be the same, the dirt will settle over
time and you will have a depression in the pavers.

Andy comments:

The 3/4 inside of a 1" for 20 feet will drop the pressure only
slightly,
depending on your flow rate. You can do this yourself..

If you do, try this:

After you have cut the existing 1 inch pipe at both ends and
fed the 3/4 pipe thru it, see if you can rotate the 1 inch pipe.
If you can, and it is loose, then you might be able to remove
it and put a new 1 inch pipe thru the hole, using the 3/4 inch
pipe as a guide. Sort of like running one piece of pipe along
the outside of another. If it works, you can then take the 3/4
back out and just bond the 1 inch in...

I've never done this, but , IF the 1 inch pipe is in the
right kind of soil, this would be worth trying. At the worst,
you still have the 3/4 pipe in place, as before.....

If you try this, and it works, please report back here.
I'm sure we'd all like to see if it works....

Andy in Eureka, Texas