Reliable F1 - Page 2

Application
Model F1 Res Sprinklers are used for Residential Fire
Protection according to UL 1626 Standard*.Besure
that orifice size, temperature rating, deflector style and
sprinkler type are in accordance with the latest
published standards of The National Fire Protection
Association or the approving authority having
jurisdiction.
When using F1 Residential Sprinklers for systems
design to NFPA 13D or NFPA 13R, use listed area of
coverage and minimum flow and pressure requirements
shown in Bulletin 135.
For systems designed to NFPA 13, use information in
this bulletin. The number of design sprinklers shall be the
most hydraulically demanding sprinklers as required by
NFPA 13. Flows and pressures can not be below the
baseline flows and pressurers.
NFPA 13
For residential sprinkler systems designed to NFPA 13,
a minimum density of 0.1 gpm/ft
2
must be provided over
the “design area” that includes the four (4) hydraulically
most demanding sprinklers for the actual coverage
areas being protected by the 4 sprinklers. The minimum
required discharge from each of the four most
hydraulically demanding sprinklers shall be the greater
of the following:
1. The flow rates given in the Reliable Residential
Sprinkler Technical Bulletins referenced in Table A
for NFPA 13D and 13R as a function of temperature
rating and maximum allowable coverage area (for
actual coverage areas less than or between those
indicated in the respective technical bulletin, it is
required to use the minimum required flow for the
next largest coverage area); or
2.A minimum discharge density of 0.1 gpm/ft
2
applied over the “design area” consisting of the four
most hydraulically demanding sprinklers for the
actual coverage areas being protected by the four
sprinklers. The maximum dimension of the actual
coverage area cannot be any greater than the
maximum coverage area indicated in the technical
bulletins referenced in Table A.
Design Note: Using the A
s
=SxLmethodto
determine the sprinkler protection area of coverage
in accordance with NFPA 13, apply the 0.1 gpm/ft
2
density to this area to determine the minimum
required flow. Compare this flow to the minimum
0.05 gpm/ft
2
cULus Listed flow for the appropriate
coverage area in the technical bulletin for the
specific residential sprinkler. If the flow stated in the
technical bulletin is less than the calculated 0.1
gpm/ft
2
density flow required, the .1 density flow
must then be used in the equation Q=K
P
, solving
for P, to establish the minimum required pressure
using the sprinkler K-factor. Note: In many cases
the listed flow of individual residential sprinklers
may exceed the required minimum 0.05 gpm/ft
2
density. Reliable has available residential sprinklers
with larger K-factors (K=5.8 and K=7.6) that will
provide lower pressure demands for 0.1 gpm/ft
2
densities in NFPA 13 residential applications.
Example No. 1
Room Size= 12 ft x 20 ft (3.6 m x 6.1 m)
Coverage Area= 12 x 20 = 240 ft
2
(22.3 m
2
)
Flow @ 0.10 gpm/ft
2
density= 240 x 0.10 = 24 gpm
Using an F1 Res 49 Pendent Sprinkler, K=4.9
Pressure= (24/4.9)
2
=24psi(1.65bar)
The baseline flow for a 20 ft x 20 ft (6.1 m x 6.1 m)
coverage area using the baseline density of 0.05
gpm/ft
2
will be 20 gpm @ 16.7 psi (75.7 L/min @ 1.14
bar). Therefore, the minimum flow required is 24 gpm @
24 psi (90.8 L/min @ 1.65 bar).
Example No. 2
RoomSize=8ftx20ft(2.4mx6.1m)
Coverage Area= 8 x 20 = 160 ft
2
(14.9 m
2
)
Flow @ 0.10 gpm/ft
2
density= 160 x 0.10 = 16 gpm
Using an F1 Res 49 Pendent Sprinkler, K=4.9
Pressure= (16/4.9)
2
= 10.7 psi (0.74 bar)
The baseline flow for a 20 ft x 20 ft (6.1 m x 6.1 m)
coverage area using the baseline density of 0.05
gpm/ft
2
will be 20 gpm @ 16.7 psi (75.7 L/min @ 1.14
bar). Therefore, the minimum flow required is 20 gpm @
16.7 psi (75.7 L/min @ 1.14 bar).
Example No. 3
Room Size= 10 ft x 16 ft (3.0 m x 4.91 m)
Coverage Area= 10 x 16 = 160 ft
2
(14.9 m
2
)
Flow @ 0.10 gpm/ft
2
density= 160 x 0.10 = 16 gpm
Using an F1 Res 76 Pendent Sprinkler, K=7.6
The baseline flow for a 16 ft x 16 ft coverage area is 21
gpm @ 7.6 psi (79.5 L/min @ 0.52 bar). Therefore, the
minimum flow and pressure is 21 gpm @ 7.6 psi (79.5
L/min @ 0.52 bar).
Example No. 4
Room Size= 14 ft x 18 ft (4.3 m x 5.5 m)
Coverage Area= 14 x 18 = 252 ft
2
(23.6 m
2
)
Flow @ 0.10 gpm/ft
2
density= 252 x 0.10 = 25.2 gpm
(94.6 L/min)
Using an F1 Res 76 Pendent Sprinkler, K=7.6
Pressure= (252/7.6)
2
=11psi(0.76bar)
The baseline flow and pressure of an 18 ft x 18 ft
coverage area is 21 gpm @ 7.6 psi (79.5 L/min @ 0.52
bar). Therefore, the minimum flow and pressure is 25.2
gpm@11psi(94.6L/min@0.76bar).
I
n general residential sprinklers require
flows and pressures as listed for 0.05
densities to achieve the proper spray pattern
so the flows and pressures at 0.05 density are
the baseline flows and pressures. Flows and
pressures below the listed 0.05 density shall
not be used.
2.