care in engineering and design is required to eliminate these air pockets. Gang drains have been used for years to drain low points on dry system lines. The same is needed for air evacuation, just at the top of the system. A small line joining the peaks of lines may be needed. As for the antifreeze piping, you're spot on about the trapped air and pressure fluctuations diluting the mix. I like to pump the antifreeze in at the control valve and exhaust air out at the heads. Left loose, they'll allow air to escape. Tighten them once the mix gets there. Pump it up to ten pounds more than static pressure and you're set. Good field workers are necessary to get good installations.
On Thu, Feb 18, 2021 at 5:10 AM Tom Duross via Sprinklerforum < [email protected]> wrote: > I think it all depends on placement and location, to remove as much as > possible. > > I've been meaning to write a similar post about anti-freeze systems and air > vents. These are almost always dead-end systems and I'm finding dilution > at > the source even after a single year. Granted 13 requires a physical end of > line which could be used to vent but I hardly ever see one with existing > systems. My only guess for dilution would be air mitigation over time > allowing water to pass the BFP or CHV into the AF portion of the system. I > would think an AAV would solve this but I wonder with all these secret new > listed formulas of AF out there, would they effect the inner parts of these > devices? Apologies for the digression from topic but saw this as an > opportunity to query the group. Too bad GLC isn't here, he'd have $0.02 to > add. > TD > > Cc: Jerry Van Kolken <[email protected]> > Subject: Air Venting (2021) > > I was reading the Air Venting discussion from early 2020 and this really > didn't come up. > > The code only requires a single vent, but I can think of several situations > where I there would every branchline would be trapped. Say a tree system > with BL on riser nipples, any system in an peaked roof where the branchline > travel up the pitch then back down. I don't under stand how the single air > vent relives the air from more than that single branchline it would be > installed on. > > I'm I think of this too much like trapped water for drainage? > > Jerry Van Kolken > Millennium Fire Protection Corp. > 2950 San Luis Rey Rd. > Oceanside, CA 92058 > (760) 722-2722 FX 722-2730 > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
