Not as a regular practice but we had an unusual residential project that was composed of 8 row homes that had to be separated by 11" because of something having to do either with property lines or seismic separation or both. So instead of abunch of seismic loops, we ran a CPVC supply pipe down a walkway along one side of the building and did a service entry for each unit.
However one thing we do as a regular practice is when there is a satellite structure to a larger building, we take the connecting pipe underground (if there's no connecting structure overhead) and tie it to the larger building system. Since Ames has just come out with small diameter in-building risers, it's a really clean solution to transition with those and pipe with CPVC. Steve Leyton (Sent from my phone; please excuse typos and voice text corruptions.) -------- Original message -------- From: Skyler Bilbo <[email protected]> Date: 3/22/19 2:33 PM (GMT-08:00) To: [email protected] Subject: Underground Sprinkler Lines Has anyone installed CPVC piping for an entire fire sprinkler system underground? We are being asked more and more on one story buildings to install wet systems where our mains are in the corridor and lines are in the walls. This involves a whole lot of drilling of 2x4's and installing a bunch of protective nailer plates (a whole lot of man hours). Seems to me like we could do it faster using a trencher, installing the vast majority of the piping underground with stub ups into the walls for sidewalls. I suppose in order to do this correctly, we would have to install a drain, perhaps by stubbing into a sump pit somewhere? I know I have seen a small amount of CPVC piping installed underground in apartments that have open stairwells between units, and those don't have a way to drain the underground portion, even though this would be after the riser controls and fall under NFPA 13(R). I'm really interested to know if anyone has done it, and/or if there are any big reasons not to. To my knowledge, this isn't specifically addressed in our standards. Thanks, Skyler Bilbo 217-819-6404 Cell
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