Bulletin 056
Page 9 of 24
December 2016
www.reliablesprinkler.com
Reliable Attic Sprinkler Hydraulic Design Criteria
Table H
Sprinklers in Attic
Number or (Area) of Sprinklers Included in Hydraulic Design
(Select Hydraulically Most Remote Sprinklers of Each Type)
Wet Pipe Sprinkler System
Dry Pipe Sprinkler System
aa=
pÉêáÉë=
apRS=
dmRS=
pí~åÇ~êÇ=
péê~ó=
aa=
pÉêáÉë=
apRS=
dmRS=
pí~åÇ~êÇ=
péê~ó=
DD Series at ridge only (Fig. 7)
5
N/A
N/A
N/A
7
N/A
N/A
N/A
DS56 at ridge only (Fig. 8)
N/A
5
N/A
N/A
N/A
9
N/A
N/A
DD Series at ridge with DS56 beyond
obstruction (Fig. 9)
5 2
N/A
N/A 7 2 N/A
N/A
DS56 at ridge with DS56 beyond ob-
struction (Fig. 10)
N/A 5 N/A
N/A N/A 9 N/A N/A
DD Series at ridge with GP56 beyond
obstruction (Fig. 11)
5 N/A 2 N/A 7 N/A 2 N/A
DS56 at ridge with GP56 beyond ob-
struction (Fig. 12)
N/A 5 2 N/A N/A 9 2 N/A
DD Series at ridge with GP56 in dormer
or cross (Fig. 13)
(Calculate upper row if 4 or less GP56
sprinklers are used in each dormer or
cross;
Separately calculate upper row and
lower row if more than 4 GP56 sprin-
klers are used in any dormer or cross
and use the greater demand)
5 N/A 2 N/A 7 N/A 2 N/A
0 N/A
(1,500 ft
2
)
(139 m
2
)
N/A 0 N/A
(1,950 ft
2
)
(181 m
2
)
N/A
DD Series at ridge with Standard Spray
sprinklers in dormer or cross (Fig. 14)
(Calculate upper row if 4 or less
Standard Spray sprinklers are used in
each dormer or cross;
Separately calculate upper row and
lower row if more than 4 Standard
Spray sprinklers are used in any dor-
mer or cross and use the greater de-
mand)
5 N/A
N/A 2 7 N/A N/A 2
Calculate design area per NFPA 13 and include
all sprinkler types that are in the design area
Calculate design area per NFPA 13 and include all
sprinkler types that are in the design area
DD Series at ridge with DD Series in
dormer (Fig.15)
5 at ridge
and up to
2 in dormer
N/A N/A N/A
7 at ridge
and up to
2 in dormer
N/A N/A N/A
DD Series sprinklers at ridge with
GP56 sprinklers at eave (Fig. 16)
5 N/A 2 N/A 7 N/A 2 N/A
DS56 sprinklers at ridge with GP56
sprinklers at eave (Fig. 17)
N/A 5 2 N/A N/A 9 2 N/A
DD Series sprinklers at ridge with DS56
sprinklers at hip or ell (Fig. 18)
5 total
N/A
N/A
9 total
(Include a max. of 7 DD
Series sprinklers in
hydraulic design)
N/A N/A
DS56 sprinklers at ridge with DS56
sprinklers at hip or ell (Fig. 19)
N/A 5 N/A
N/A N/A 9 N/A N/A
DD Series sprinklers at ridge with
Standard Spray sprinklers at hip or ell
(Fig. 20)
(Calculate upper row if 4 or less
Standard Spray sprinklers are used in
each hip or ell; Separately calculate
upper row and lower row if more than 4
Standard Spray sprinklers are used in
any hip or ell and use the greater de-
mand)
5 N/A
N/A 2 7 N/A N/A 2
Calculate design area per NFPA 13 and include
all sprinkler types that are in the design area
Calculate design area per NFPA 13 and include all
sprinkler types that are in the design area
DS56 sprinklers at ridge with Standard
Spray sprinklers at hip or ell (Fig. 21)
(Calculate upper row if 4 or less
Standard Spray sprinklers are used in
each hip or ell; Separately calculate
upper row and lower row if more than 4
Standard Spray sprinklers are used in
any hip or ell and use the greater de-
mand)
N/A 5 N/A 2 N/A 9 N/A 2
Calculate design area per NFPA 13 and include
all sprinkler types that are in the design area
Calculate design area per NFPA 13 and include all
sprinkler types that are in the design area
