Mike, Almost 1,300lf of 6"?
Is the question how long will it take for 18psi to bleed off, or how long for water at pressure to expel the air? One standpipe with several vertical risers? If not connected at the top the other risers' air will just be compressed and not bled off, similar to branch lines on a dry system. Best Bruce Verhei > On Feb 28, 2017, at 08:55, Mike Stossel <[email protected]> wrote: > > I figured that was probably going to be the answer. The only reason I was > trying was to appease a customer. I am with you and don’t see what the > problem is, if it works great if not add another hose valve. I am sure as > you know some clients are extremely hard to please. > > Mike Stossel SET > <image001.png> > 36 Barren Road > East Stroudsburg, PA 18302 > Office: 973-670-2627 > [email protected] > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Matt Grise > Sent: Tuesday, February 28, 2017 11:47 AM > To: [email protected] > Subject: RE: Air Relief Time > > To make sure I am following this correctly – you need to know how long it > will take to drop from 18 psi to 0 psi if you open a 2.5” hose valve on a > 1902 gallon standpipe? Then – if it takes more than 3 minutes, you have to > add a second hose valve? > > What if you just build it and test it. Then if it takes more than 3 minutes > you can cut in a mechanical T and second hose valve? > > It seems like there are a lot of variables that would make it impractical to > do a very accurate calc. If all you need to do is add a second hose valve, > why not just build it and see what happens? > > Matt > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Mike Stossel > Sent: Tuesday, February 28, 2017 10:40 AM > To: [email protected] > Subject: RE: Air Relief Time > > The maximum minutes would be three the minimum can be anything, and the > ambient air I would say place at about 30 since we are headed into Spring. > Yes, you can definitely contact me off Forum, I greatly appreciate the help. > > Mike Stossel SET > <image004.png> > 36 Barren Road > East Stroudsburg, PA 18302 > Office: 973-670-2627 > [email protected] > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Brad Casterline > Sent: Tuesday, February 28, 2017 11:08 AM > To: [email protected] > Subject: RE: Air Relief Time > > Mike, > > 1) Need to know the min. and max. ambient air temperatures. > > 2) May I contact you off Forum? > > Brad > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Mike Stossel > Sent: Tuesday, February 28, 2017 7:17 AM > To: [email protected] > Subject: Air Relief Time > > I am trying to calculate the time it will take for a 2-1/2” hose valve to > relieve a standpipe system of air. I am designing a temporary standpipe > system in NYC and the requirement is to fill the entire system with air and a > single 2-1/2” hose valve needs to relieve the pressure within 3 minutes or a > second will need to be added. My total system volume will be 1902 gallons > and the staring air pressure will be at 18psi. Does anyone know of a way to > calculate this? > > Thanks for the help. > > Mike Stossel SET > <image005.gif> > 36 Barren Road > East Stroudsburg, PA 18302 > Office: 973-670-2627 > [email protected] > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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