Hello rongreenman, I have seen this before on a large grid with a 20 year old alarm valve in it, Air trapped in the grid was the problem, Found a large section where the mains and branch lines had been raised over the drain, Had to run an Auxiliary Drain off the high part to vent air and then all was good.
Thursday, July 21, 2016, 1:55:39 PM, you wrote: > I'm seeing a consensus here that the problem has to do with the cushioning > effect of air and that eliminating air inside the piping is a good idea. > On Thu, Jul 21, 2016 at 10:45 AM, Mark Phillips <[email protected]> > wrote: > > > > Air Vent up High > > > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of rongreenman . > Sent: Thursday, July 21, 2016 1:15 PM > To: [email protected] > Subject: Resi Riser - Character set not allowed > > > > > Anyone experienced this before? > > > > > > The original CSC version of the Tyco rest riser in four inch. > > > > > > http://tyco-fire.com/index_link.php?link=TFP962&_ga=1.123267982.464632162.1469119864 > > > > > > Flow throw the IT port and you can watch the lever in the flow switch move > and then, before alarming, move back to the static condition and essentially > reset the diaphragm timing. Watch it long enough and listen to the flow and > you can identify the flows changing the pitch suggesting turbulence. After a > bit you can identify and the tones and know when the paddle will move > (indicated by the lever) and when it will retreat back to what appears a low > flow situation. > > > > > > The flow switch works fine when flowing the main drain but not throw the test > orifice, although the technician asking me this question says it worked last > year. All I can figure is there are lots of corners in solved and the flow > keeps going from a laminar to turbulent pattern and the paddle resets during > the turbulent period. It seems to me the flow switch and the test outlet are > too close together but this is the only one of these I've ever seen this > particular problem occur on and it is a listed device that's been around for > a long time in both CSC and Tyco livery. > > > > > > I suggested the technician try the flow test again at a different time of day > and see what happens. That won't correct the problem but if it works it > suggests that the problem was due to a temporary condition (maybe repeating) > of the water supply. > > > > > > Any other ideas? > > > > > -- > > > > > > Ron Greenman > > > 4110 Olson Dr., NW > Gig Harbor, WA 98335 > > [email protected] > > 253.576.9700 > > > > > > A problem well stated is a problem half solved. -Charles F. Kettering, > inventor and engineer (1876-1958) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- Best regards, Charles mailto:[email protected] _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
