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Ive worked in 1 house that had a sprinkler system in it. The homeowner was also a sprinkler system company owner. It had the orange pipe. I didnt pay attention, but if you guys say its CPVC I'll believe you. I do remember it having its own 2" water service from the street.
Theres a dry system at my shop. It functions as Bob mentioned with an air compressor to keep 70 or so pounds of air on the top side of the clappers. If a head opens up the air pressure will drop, and the water pressure will overcome the clappers filling the system and sending water to the open head. Theres 6 of these clapper valves with 6" lines supplying each one. Its an impressive system that serves a total of 140,000 square feet.
in this instance, If I install it, it'll likely end up a wet system, just to avoid the having to install a compressor, and i'll likely make it a pressure loop, with no other fixtures on it.
if the concern is a line where the water is never flushed out, it's no different than that upstairs hall bath in many mcmansions after the kids move out.
Originally posted by NHMaster3015
No, it's not rocket science, it's plumbing and unlike rocket science it requires a license.