Read 7.2.4 closely: “Where more than two hose connections are used downstream of a pressure-regulating device …”
A floor control assembly or a single hose connection with integral PR device does not require redundancy or a bypass because that section of the standard only applies to multiple hose connections influenced by a single PR device. My opinion only, but the standard clearly says what is says … SL From: Sprinklerforum [mailto:[email protected]] On Behalf Of Tony Silva Sent: Wednesday, September 06, 2017 11:27 AM To: [email protected] Subject: PRV By-pass NFPA 14, 2010, 7.2.4 (4) requires a bypass across a prv. Is it only when multiple smaller prv's are used instead of a larger prv, or whenever any prv is used? My application is there is a prv at the floor control stations supplying combined sprinkler/standpipe. Would this prv need a by-pass? The other question is will every prv need control valves upstream and downstream? I know it is good engineering practice to have the valves and by-pass, but very often there is not much space inside the stairs. What is the general industry practice? Thanks, Tony
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