NFPA 14 6.3.5 doesn't make any exception for dry combined systems, at least that I can see, the annex material has diagrams that are clearly for wet pipe systems, but the wording really doesn't leave any wiggle to get out of doing it on non wet systems. It applies any time a sprinkler system connection is made to a standpipe, so regardless of whether or not the building is considered multi story if you take off at each level from the standpipe to a sprinkler system you are by code required to provide a shutoff and check. The check valve seems a bit silly in this case, but I can understand why they'd want a control valve (similar to the requirements for each vertical standpipe to have its own valve to allow maintenance without taking the entire system out of service). Mike Morey, SET, CFPS Sprinkler Designer BMW Constructors, Inc. O: 317.651.0596 | C: 317.439.2695 www.bmwc.com
________________________________ From: [email protected] on behalf of [email protected] Sent: Thu 4/21/2011 7:14 PM To: [email protected] Subject: RE: Combination standpipe riser & hose flows But is that for wet systems? For a dry system such as this the shut off valves and check valves would serve no purpose. The system is either totally flooded due to head(s) fusing or it's dry. For the application I have, there is no real building code correlation to an occupied mult-story buildings. These structures are basically big machines. Miles of pipe, vessels, pumps, and other equipment all jam packed into half the space it ought to occupy. There are no walls, the upper level has equipment on it exposed to the sky. The challenge of laying out a sprinkler system is often beyond imagination. Eveyone is clamoring for every cubic inch of space to put their stuff. The red pipe, nobody thinks about that. Just another day in paradise. :) Craig Prahl CH2MHILL/SPB 864-599-4102 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
