i am working on a project where there are two rectangular rooms with high ceilings surrounded by corridors with 8 ft ceilings. For the sake of this discussion, assume the rectangular dimensions are 30 ft x 70 ft. The system has a 3" main running on one of the long dimensions and a 1-1/2" loop around the perimeter corridors. The sprinklers for the high ceiling rooms are fed off the 30 ft sides. The only other sprinklers fed from the 1-1/2" are those for the corridor ceilings.
For figuring seismic, the two pieces of 1-1/2" are considered cross mains by definition because they feed branch lines. However, since the 1-1/2" along the 70ft leg only includes sprinklers on swing joints are fed from it, can it be considered a branch line? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
