MiamiCuse wrote:

I have a few busted sprinkler heads so I decided to dig a trench along the
line and examine the line. I was amazed that in a stretch of 60' the pipe
went from 1-1/2" diameter to 3/4" to 1" then back to 3/4" as it goes
downstream. I think over the year sections of pipes were being repalced or
modified.

I assume the changes in the diameters like this would cause unnecessary
pressure loss or even un-uniform pressure for each sprinkler head on that
line? So I am planning to replace them all with a long stretch of pipe with
the same diameter. I am not sure what diameter to use, should I stay with
1-1/2" or reduce it to a smaller diameter? This line runs down the middle
of a side yard about 25' wide and 75 feet long but the run is only 60'. How
far apart should I space the sprinkler heads if I used 360 degree heads?

Another question is at the end of that 60' run is a big tree occupying the
end of that yard, and the root system is such that I cannot trench any
further. I am wondering if it's ok (will there be enough pressure) to put a
big 360 degree impact rotor sprinkler head on the end of the pipe run to try
to cover the area of the tree, but I don't know if it's going to have enough
pressure to run that rotor sprinkler at the end of the line. How can I
determine that without actually gluing up everything to try it?

Thanks,

MC

If you plan to replace lines and heads, the simplest thing to do is to
use one of the manufacturers free design services. You send them the
dimensioned sketch of the yard, water supply info, etc. and in a week or
two they send you a full design with all the piping and sprinkler head
specs. Get this design and then just use the portion of it you need, and
as other areas need repair, just refer to the plan again for what to
replace things with.