If you are using electric flow switches most of them have a built in retard feature (or time delay) witch allow the flow switch to absorb a pressure surge with out activating the alarms. This was meant to replace the old fashioned Retard Chamber used in conjunction with Alarm Valves.
Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 TEL: (802) 434-2968 tston...@comcast.net -----Original Message----- From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of Cesar Lira Sent: Thursday, August 9, 2018 1:53 PM To: sprinklerforum@lists.firesprinkler.org Subject: RE: Building Heights Requiring Standpipes Hi. I have a doubt. NFPA13 request that all sprinklers system shall have a Retarding device. But in our sprinkler systems installed we are not using it. Because we have a water flow sensor above check alarm instead of an alarm pressure switch or water motor alarm. Is it correct as I have it?. What would be the purpose of installing the retarding device if the alarm pressure switch or water motor alarm are not installed. My client demands to me this devices and I am looking for how can defend that I not having installed it I need to know if a water flow alarm and the pressure switch alarm are both necessary? Or just one of this options. _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
