TFP610
Page 17 of 28
HYDRAULIC CALCULATIONS
Attic sprinklers must be calculated in conformance with these guidelines. In all cases, the design area shall include the
most hydraulically demanding sprinklers. More than one set of calculations may be required to prove different situations.
For individual areas requiring more than four AP Sprinklers, the maximum area of attic protected by AP Sprinklers is lim-
ited to 3000 ft
2
(279 m
2
) in any single area. Areas must be separated by a minimum of 15 feet (4,6 m) by an area protected
by BB, SD,or HIP Sprinklers, in order to be considered separate areas.
The hydraulic calculations have been divided into three parts as follows:
• FIGURE 20-A: “Attics Protected Entirely By BB, SD, and HIP Attic Sprinklers”.
20-A-1 (Page 18) BB Sprinklers
20-A-2 (Page 18) BB and HIP Sprinklers
20-A-3 (Page 19) BB and SD Sprinklers
20-A-4 (Page 19) SD Sprinklers
20-A-5 (Page 19) SD and HIP Sprinklers
20-A-6 (Page 19) HIP Sprinklers
• FIGURE 20-B: “Attics Protected With A Mixture Of BB. SD, and HIP Attic Sprinklers And AP Sprinklers”.
20-B-1 (Page 20) SD Sprinklers & AP Sprinklers At The Ridge
20-B-2 (Page 20) BB Sprinklers & AP Sprinklers At The Eaves or Beyond An Obstruction
20-B-3 (Page 21) BB Sprinklers & AP Sprinklers At The Hip
20-B-4 (Page 21) BB Sprinklers, SD Sprinklers, HIP Sprinklers, & AP Sprinklers At The Hip
20-B-5 (Page 22) BB, SD, or HIP Sprinklers & AP Sprinklers in a Dormer, at a Cross, or at an Ell
20-B-6 (Page 22) BB,SD, or HIP Sprinklers & AP Sprinklers Separated By Compartmentalization
• FIGURE 20-C: “Attics Protected With A Mixture Of BB. SD, and HIP Attic Sprinklers And Standard Spray
Sprinklers”.
20-C-1 (Page 23) SD Sprinklers & Standard Spray Sprinklers At The Ridge
20-C-2 (Page 23) BB Sprinklers & Standard Spray Sprinklers At The Eaves or Beyond An Obstruction
20-C-3 (Page 24) BB Sprinklers & Standard Spray Sprinklers At The Hip
20-C-4 (Page 25) BB Sprinklers, SD Sprinklers, HIP Sprinklers, & Standard Spray Sprinklers At The Hip
20-C-5 (Page 26) BB, SD, or HIP Sprinklers & Standard Spray Sprinklers in a Dormer, at a Cross, or at an Ell
20-C-6 (Page 26) BB, SD, or HIP Sprinklers & Standard Sprinklers Separated By Compartmentalization
B
A
A
B
A
VERTICAL RISER VERTICAL RISER
BRANCHLINE
VERTICAL SPRIG
ARMOVER SPRIG
ANGLE SPRIG
DIRECT MOUNT
BRANCHLINE
A = 6" (150 mm) MAX.
B = 12" (300 mm) MAX.
MODEL BB
BACK TO BACK
MODEL SD
SINGLE DIRECTIONAL
MODEL HIP
FIGURE 19
EXPOSED CPVC WITH BB, SD, AND HIP SPRINKLERS
FIGURE 20
HYDRAULIC CALCULATIONS
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