When say sprigs do you mean the sprinklers are on sprigs as defined in 13 or do you mean the branch lines are are of risers that some folks sometimes call sprigs? And as a fun FYI for everyone, autocorrupt changed sprigs to spirirs in one place, springs in another, and sprints in another.
On Fri, Mar 6, 2020 at 10:03 AM Bob Knight via Sprinklerforum < sprinklerforum@lists.firesprinkler.org> wrote: > In this case, the branch lines are all located beneath the trusses. The > trusses are shallow open web wood two feet on-center. The elevation is > 11’8” everywhere, so the sprigs are actually the highest points. That > said, it sounds like the air vent just needs to be at the furthest point > that it can be. > > > > > > Thank you, > > > > Bob Knight, CET III > > Fire by Knight, LLC > > 208-318-3057 > > > > *From:* Sprinklerforum [mailto: > sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of *Steve > Leyton via Sprinklerforum > *Sent:* Friday, March 06, 2020 10:52 AM > *To:* b...@firebyknight.com; sprinklerforum@lists.firesprinkler.org > *Cc:* Steve Leyton > *Subject:* RE: Air Venting > > > > I’d put it on a branch along the highest part of the building to which > piping is attached, assuming that the piping more or less follows the roof > contour. > > > > SL > > > > *From:* Sprinklerforum [mailto: > sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of *Bob Knight > via Sprinklerforum > *Sent:* Friday, March 06, 2020 9:21 AM > *To:* sprinklerforum@lists.firesprinkler.org > *Cc:* Bob Knight > *Subject:* RE: Air Venting > > > > Thanks Steve. I get the high point part. This system is all one > elevation, but sprigs are being used. Do I put the air vent on one of the > sprigs, and is the most remote branch line the appropriate location? > > > > > > Thank you, > > > > Bob Knight, CET III > > Fire by Knight, LLC > > 208-318-3057 > > > > *From:* Sprinklerforum [mailto: > sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of *Steve > Leyton via Sprinklerforum > *Sent:* Friday, March 06, 2020 10:17 AM > *To:* b...@firebyknight.com; sprinklerforum@lists.firesprinkler.org > *Cc:* Steve Leyton > *Subject:* RE: Air Venting > > > > Usually - and I mean to say, almost always – that’s going to be the high > point of the system. Trapped are generally migrates to the high point > eventually. There are exceptions and some piping configuration can trap > air in pockets that aren’t at the highest point of the system, but that’s > usually where it is. > > > > > > > > > > > > > > *From:* Sprinklerforum [mailto: > sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of *Bob Knight > via Sprinklerforum > *Sent:* Friday, March 06, 2020 9:11 AM > *To:* sprinklerforum@lists.firesprinkler.org > *Cc:* Bob Knight > *Subject:* Air Venting > > > > Not being an air venting expert, when NFPA 13 (2016 ed.) says “The air > venting valve should be located where it will be > > most effective. System piping layout will guide the designer in choosing > an effective location for venting. In order to > > effectively accomplish venting, it is necessary to choose a location where > the greatest volume of trapped air is vented > > during the first fill and each subsequent drain and fill event (A.8.16.6).” > > > > No other guidance is provided, so would this be at the most remote branch > line, or at the end of a dead end main, or somewhere else? > > Is there a “best practice” that is being used? > > > > Thank you, > > > > Bob Knight, CET III > > Fire by Knight, LLC > > 208-318-3057 > > [image: FBK-LOGO-EMAIL] > > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- Sent from Gmail Mobile
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