In trying to find an answer for Todd's question, I looked into the 2007 edition starting at section 8.6.4.1.3. In reviewing this, I could not find a answer, but I was thinking that in calculating the ceiling due to the addition of sprinklers, that the attic piping would have less sprinkler (hopefully, even through you may have to increase the remote area due to the slope) then the ceilings if calculating 1500 sq. ft. If so, if the ceiling works, then the attic should work. (This is not telling anyone anything they did not already know.) However, in reviewing these sections, am I understanding correctly that the 5'-0 rule, 120 sq. ft., 15 parallel, 10' perpendicular and the 20 psi if greater than 8' perpendicular to the slope applies only if it is a combustible concealed space? So if I had a light hazard, combustible obstructed, members 3' or less building with a roof slope 4:12 or greater, open to the floor (no attic space / no ceilings), I could space the sprinklers at a 130 sq. ft. maximum, 7'-6 from the wall and 15' apart? In reading Table 8.6.2.2.1 (a) and the corresponding sections, those rules only apply to combustible concealed spaces under pitched roofs.
Gregg Fontes Cen-Cal Fire Systems, Inc. 209-334-9119 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - work Sent: Monday, January 29, 2007 12:03 PM To: [email protected] Subject: pipe schedule modifications I am working on a building which has an existing pipe schedule system. The system provides protection both above and below. Each area has separate cross mains and branch lines, but is fed by a common feed main. The ceiling (both existing and new) are flat and the roof is arched. The existing piping for the area below is to be re-used to pipe sprinklers below a new ceiling. This system below is to be hydraulically calculated, due to the number of sprinklers necessary to accommodate the new floor plan. May the system above (at the roof) be treated as an existing pipe schedule and not be calculated? If it does need to be calculated, how do we calculate the roof slope for an arched ceiling? It is over the 2:12 slope at the hip, but decreases to flat at the "peak". _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
