Matt I've seen this, at least for a short time, by eliminating the air. Best example 4-story office, OH-2 (FM HPR).
Replace the checks... Are you replacing the clappers, or the full check valves, or the assembly? Is it still a listed assembly for the water department? Bv -----Original message----- From: Matt Mueller <m...@metrofp.com> To: "'sprinklerforum@firesprinkler.org'" <sprinklerforum@firesprinkler.org> Sent: Wed, Feb 20, 2013 18:01:28 GMT+00:00 Subject: RE: Flow switch problem Seen this a bunch of times, and I could have told you it was an Ames. Ames has two different cam checks they use in their SS series. I'm nor exactly sure which is standard, but one has a notch, or ridge on the cam lever that requires a higher flow than one sprinkler to maintain flow through the body of main device. So basically the check opens, but can't get fully past this notch, then closes when the pressure on the downstream side gets closer to the incoming. Water continues through the bypass until pressure drops enough to make the main check open again. You can verify this by closing the bypass to see if the problem stops. The solution is to change the checks to checks designed for "fire flow" which do not have this notch. Matthew Mueller Metropolitan Fire Protection 175 Gordon St Elk Grove Village Illinois, 60007 P 847.758.9820 F 847.758.9822 C 847.602.3576 -----Original Message----- From: Hillman, Lorenzo [mailto:hillm...@leonschools.net] Sent: Wednesday, February 20, 2013 6:39 AM To: sprinklerforum@firesprinkler.org Subject: RE: Flow switch problem Could it be a programming problem ie. The point is set as a momentary relay and not a latching relay? Just my 2 cents. Lorenzo Hillman Coordinator, Fire & Safety Inspections Leon County Schools\ Facilities Cell. 850-933-6843 Office. 850-617-1782 FX. 850-617-1790 -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of John Drucker Sent: Wednesday, February 20, 2013 7:03 AM To: jaycs7...@yahoo.com; sprinklerforum@firesprinkler.org Subject: Re: Flow switch problem Is there a BFP on system ? John Drucker - Mobile Email ----- Original Message ----- From: sprinklerforum-boun...@firesprinkler.org <sprinklerforum-boun...@firesprinkler.org> To: Sprinkler -Forum <sprinklerforum@firesprinkler.org> Sent: Wed Feb 20 06:55:16 2013 Subject: Flow switch problem We have a wet system that is having problems with the flow switch. The flow switch would send a signal and then stop and then send another signal. This would be happening intermittently. We figured the flow switch diaphram was bad and then replaced the flow switch with the same results. The main drain test is 60 psi with 50 psi residual. The inspector's test was a globe valve that would flow water intermittantly; so we changed it to a ball valve. It flows water continuously now with the same problem with the flow switch. We checked the vane on the flow switch and the pipe is clean, so it's not hanging up at the riser. Any suggestions? Jay Stough Tilley fire Equipment Co. -------------- next part -------------- An HTML attachment was scrubbed... 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