Design
Criteria
The Model BVR-2 Residential Pendent and Recessed Pendent
Sprinklers are UL, ULC Listed and MEA Approved for use in
accordance with current NFPA standards on wet pipe sprinkler
systems. These sprinklers with a maximum ceiling to top of
sprinkler deflector distance of 4 inches, have been investigated for
use under smooth flat horizontal ceilings with slopes up to 2
inches per foot using the hydraulic design requirements found in
Table 1. These sprinklers with a maximum ceiling to top of
sprinkler deflector distance of 4 inches, have also been
investigated for use under smooth flat sloping ceilings with slopes
up to 8 inches per foot using the hydraulic design requirements
found in Table 2 as well as the sloped ceiling "Specific Application
Design Criteria" found in Figure 4. When conditions exist that do
not meet all the parameters of the "sloped ceiling "Specific
Application Design Criteria" found in Figure 4, and when
acceptable to the local authority, additional guidance on the
placement of residential sprinklers on sloped ceilings has been
provided in Figures 5 -14. This information will provide the
minimum spacing requirements necessary for preventing the
wetting (i.e., cold soldering) of the heat responsive element (Bulb)
of a non-operated Central Model BVR-2, which is adjacent to one,
which has operated. In these situations the minimum required
single and multiple sprinkler flow rates given in Table 1 should be
used. Your local authority should be consulted to determine the
number of sprinklers required in the hydraulic design area.
The Recessed Pendent Sprinklers are only listed with the Series
BV Res./QR Recessed Escutcheon Assembly. These sprinklers
can be used with any metalic flush or extended escutcheon,
provided the maximum ceiling to top of sprinkler deflector
dimension specified in Table 1 or Table 2 is maintained.
The minimum required single and multiple sprinkler flow rates for
systems designed to NFPA 13D or NFPA 13R occupancies are
given in Table 1 and Table 2 as a function of temperature rating,
ceiling to top of deflector distance, and the maximum allowable
coverage areas. The single sprinkler flow rate is the minimum
required discharge from the most hydraulically demanding single
sprinkler and, the multiple sprinkler flow rate is the minimum
required discharge from each of the total number of "design
sprinklers" as specified in NFPA 13D or NFPA 13R.
TIA 99-1 (Tentative Interim Ammendment) with an effective date
of May 22, 2000 states that the minimum required discharge from
Table 2 - BVR-2 Pendent & Recessed Pendent
UL & C-UL Specific Application Sloped Ceiling
Hydraulic Design Requirements for NFPA 13D &
NFPA 13R Occupancies (For use with Figure 4)
Table 1 - BVR-2 Pendent & Recessed Pendent
Hydraulic Design Requirements for NFPA 13D &
NFPA 13R Occupancies
Minimum Design Flow
Coverage
Multiple
Area
Single Sprinkler
Sprinklers
12' x 12'
13 GPM (9.1 psi)
11.5 GPM (7.1 psi)
(3,7 x 3,7m)
49,2 lpm (0,63 bar)
43,5 lpm (0,49 bar)
14' x 14'
18 GPM (17.5 psi)
14 GPM (10.6 psi)
(4,3 x 4,3m)
68,1 lpm (1,21 bar)
53,0 lpm (0,73 bar)
16' x 16'
18 GPM (17.5 psi)
14 GPM (10.6 psi)
(4,9 x 4,9m)
68,1 lpm (1,21 bar)
53,0 lpm (0,73 bar)
18' x 18'
20 GPM (21.6 psi)
16 GPM (13.8 psi)
(5,5 x 5,5m)
75,7 lpm (1,49 bar)
60,6 lpm (0,95 bar)
20' x 20'
20 GPM (21.6 psi)
16 GPM (13.8 psi)
(6,1 x 6,1m)
75,7 lpm (1,49 bar)
60,6 lpm (0,95 bar)
Maximum Ceiling to top of Sprinkler Deflector 4 inches.
Maximum Ceiling to top of Sprinkler Deflector 4 inches.
Minimum Design Flow
Coverage
Multiple
Area
Single Sprinkler
Sprinklers
12' x 12'
13 GPM (9.1 psi)
11.5 GPM (7.1 psi)
(3,7 x 3,7m)
49,2 lpm (0,63 bar)
43,5 lpm (0,49 bar)
14' x 14'
20 GPM (21.6 psi)
14 GPM (10.6 psi)
(4,3 x 4,3m)
75,7 lpm (1,49 bar)
53.0 lpm (0,73 bar)
16' x 16'
20 GPM (21.6 psi)
14 GPM (10.6 psi)
(4,9 x 4,9m)
75,7 lpm (1,49 bar)
53,0 lpm (0,73 bar)
18' x 18'
20 GPM (21.6 psi)
16 GPM (13.8 psi)
(5,5 x 5,5m)
75,7 lpm (1,49 bar)
60,6 lpm (0,95 bar)
20' x 20'
20 GPM (21.6 psi)
16 GPM (13.8 psi)
(6,1 x 6,1m)
75,7 lpm (1,49 bar)
60,6 lpm (0,95 bar)
each of the "design sprinklers" for systems designed to NFPA 13
must be calculated based on delivering a minimum design density
of 0.1 gpm/sq. ft. for each of the listed coverage areas shown in
Table 1 or Table 2. Consult the authority having jurisdiction
regarding the application of this TIA to the currently adopted
NFPA 13.
Model BVR-2 Residential Pendent and Recessed Pendent
Sprinklers must be installed using the obstruction criteria for
extended coverage sprinklers found in the current edition of
NFPA 13.
NOTES
Residential Fire Sprinkler Systems should only be designed
and installed by those competent and completely familiar
with automatic sprinkler system design, installation
procedures, and techniques.
The sprinkler must be secured in position by firmly fastening
the sprinkler system piping to the structure. If the sprinkler is
not properly secured in position, reaction forces resulting
from sprinkler operation could alter its orientation and its
water distribution pattern. The sprinkler escutcheon cannot
be used to hold the sprinkler in position.
Several criteria may apply to the installation and usage of
each sprinkler. Consequently, it is recommended that the
sprinkler system designer review and develop a working
understanding of the complete list of criteria prior to initiating
the design of the sprinkler system.
Questions concerning sprinkler installation and usage
criteria, which are not covered by the following instructions,
should be submitted to Central Sprinkler. Include sketches
and technical details as appropriate.
In some instances, the requirements of this document may
concern specifications which are more stringent and which
take precedence over those specified in NFPA 13, NFPA 13D,
NFPA 13R, or by the authority having jurisdiction.
OBSOLETE
