"Craig" wrote
Been in lots of places that used it and seen lots of failures. You do
know that Sch 40 and 80 both have an ultimate tensile strength of
only 7400psi at 73 deg. F.,( black iron is about 10-15 times that )
and that by the time you get to around 90deg F., that is reduced by
almost 50%? By the time you run the numbers for the data given in ASTM
D1784, the code that your pvc pipe is rated by, when you do all the
required derates and apply all the safety factors required for sound
engineering practices, 1" PVC is rated to handle about 4psi working
pressure. It also might interest you, in that the code specifically
states that the rating is good for incompressible liquids only and
that pvc and cpvc are to never be used in a compressible gas system
without revising the pressure ratings to those found under ASME B31.3.

OK, I can accept at face value that PVC isn't meant to handle compressed air
Compressible vs incompressible fluids, no problem.

But out of curiosity, how do you get from a 7400 psi under ANY conditions to
a safe working pressure of 4 psi?
That requires dividing 7400 by 2 almost TWELVE times!!!
Are there twelve (or more) separate conditions that each compromise the
tensile strength by 50% (or more)??!?!?

Just wondering, Eric