On Feb 28, 7:46�am, wrote:
I'm replacing some old sprinkler piping with PVC. �A one inch pipe
ends branching off using a "T" fitting to the right in a 10 foot run
and to the left for 70 feet. �For the 10 foot run to the right should
I continue with one inch pipe, then decrease the diameter to the
left. �Or since it's only 10 feet would it be better to go with 3/4"
pipe to the right and one inch to the left, decreasing to the end? �Or
does it matter?

Is that a good practice to use PVC? Will it pass code? I don't know.
Have you checked with the local code enforcement?

It would seem to me that the PVC may weaken and maybe rupture before
the sprinkler would go off ( depending on sprinkler temp. and heat
build-up in the ceiling).

It don't take long for PVC to melt using a small candle flame (about
10 seconds).

Hank