System Risers can be sized per hydraulic calculations. Risers 3" and smaller can be served by a single 2.5" FDC per NFPA 13 6.8.1
Larger sized risers require (2) connection 2.5" 8.17.2.3 provides additional guidelines/ clarifications Underground lead-ins can be sized per hydraulic calculations when serving a sprinkler system only When underground is serving hydrant(s) minimum size is 6" _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
