I watched the video, but I still don’t get it. Maybe I’m just not too bright, but if the branch lines and other parts of the system are higher than the location of that device, wouldn’t there still be a lot of trapped air in the system?
I almost seems like the premise is that the air is entering the system as it gets filled, but that’s not the case. The air is in the system before it’s filled and we’re just trying to get as much of it displaced with water as we can. It seems like this device would be much less efficient than a standard high-point vent or remote inspector’s test. What am I missing? From: Sprinklerforum [mailto:[email protected]] On Behalf Of James McHugh via Sprinklerforum Sent: Monday, March 9, 2020 9:07 AM To: [email protected] Cc: James McHugh <[email protected]> Subject: RE: [EXTERNAL] Re: Air Venting The AGF Model 7950ILV<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.purgenvent.com_products_m7950-2Dair-2Dvent.html&d=DwMGaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A&m=DEjAc8hnK3HyBteLzxax6q_lxKvmsxEsvHoJmpn_ZgI&s=Onx-LhXgFPVel6_FOw2wnciuyBtucafndk4Bj5-2PRE&e=> works like a typical expansion chamber with the inlet and the outlet line size and the center is a larger diameter forming a trap chamber. After initial purging of the air subsequent air that migrates up through the system gets caught and vented out through the larger diameter center chamber From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of Kyle.Montgomery via Sprinklerforum Sent: Monday, March 9, 2020 12:02 PM To: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> Cc: Kyle.Montgomery <[email protected]<mailto:[email protected]>>; Ben Young <[email protected]<mailto:[email protected]>> Subject: RE: [EXTERNAL] Re: Air Venting How in the world would that work? I mean, the air is in the pipe when it’s installed, it doesn’t enter at a later date. From: Sprinklerforum [mailto:[email protected]] On Behalf Of Ben Young via Sprinklerforum Sent: Friday, March 6, 2020 2:04 PM To: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> Cc: Ben Young <[email protected]<mailto:[email protected]>> Subject: [EXTERNAL] Re: Air Venting The idea is to get out a majority of the trapped air but not every bit. So in your case you don't need to tie in every sprig and have multiple air vents, you could put it off one of the back sprigs but a remote branch line works too. The other option is to use AGFs in line vent that you can put near the beginning of a system and it supposedly gets the air out before it has a chance to form pockets downstream. Haven't used one yet but they seem cool On Fri, Mar 6, 2020 at 1:33 PM Bob Knight via Sprinklerforum <[email protected]<mailto:[email protected]>> 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:[email protected]<mailto:[email protected]>] On Behalf Of Steve Leyton via Sprinklerforum Sent: Friday, March 06, 2020 10:52 AM To: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> 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:[email protected]<mailto:[email protected]>] On Behalf Of Bob Knight via Sprinklerforum Sent: Friday, March 06, 2020 9:21 AM To: [email protected]<mailto:[email protected]> 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:[email protected]<mailto:[email protected]>] On Behalf Of Steve Leyton via Sprinklerforum Sent: Friday, March 06, 2020 10:17 AM To: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> 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. [cid:[email protected]] From: Sprinklerforum [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Bob Knight via Sprinklerforum Sent: Friday, March 06, 2020 9:11 AM To: [email protected]<mailto:[email protected]> 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 [FBK-LOGO-EMAIL] _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwMFaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A&m=XBAfr8VvT_tqVmRgf4SS23R-L_XrkNqeFKnmzVeos0o&s=KKnRzmomHZu6jow9hSzsZThLbttz2R2r9rvIf1HsADE&e=> -- Benjamin Young
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