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 > > -- 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)
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