Design
Criteria
FM APPROVAL CRITERIA
The Model EC-25 Extended Coverage
Upright Sprinklers (SIN TY9128) are
FM Approved to be utilized in accord-
ance with the following guidelines:
1. Application:
The Model EC-25
Extended Coverage Upright Sprin-
klers may be used to protect any occu-
pancy for which there is an area/den-
sity design criter ion up to 11.2
K-Factor standard spray (control-
mode area/density) sprinklers speci-
fied in FM Global Data Sheets. The
Model EC-25 Sprinklers are not ap-
proved for use in control-mode specific
application (e.g. large-drop) or sup-
pression-mode (ESFR) protection de-
signs.
2. Hydraulic Design:
Area/density de-
signs should be the same as those for
11.2 K-Factor standard spray (control-
mode area/density) sprinklers when a
separate 11.2 K-Factor standard spray
(control-mode area/density) sprinkler
design criteria is provided. Otherwise
use the same design criteria as 5.6 or
8.0 K-Factor standard spray (control-
mode area/density) sprinklers. The
minimum design pressure is 7 psi (0,5
bar), and a K-factor of 25.2 (363 met-
ric) is to be used for hydraulic calcula-
tions. As for all area/density sprinklers,
the hydraulic design for the Model EC-
25 sprinklers should be based on the
design density applied over the actual
area of coverage per sprinkler.
For example: when sprinkler spacing is
14 feet by 12 feet - 6 inches (4,3 x 3,8
m) or 175 ft
2
(16,3 m
2
), and the design
density is 0.6 gpm/ft
2
(24,4 mm/m), the
sprinkler design flow rate is 105 GPM
(397 LPM) and the required design
pressure is 17.4 psi (1,2 bar).
3. System Type:
Wet-pipe, dry-pipe,
or preaction systems are acceptable.
4. Sprinkler Spacing:
The maximum
area of coverage per sprinkler is 196
sq. ft. (18,2 sq. m). The minimum area
of coverage per sprinkler is 100 sq. ft.
(9,3 sq. m).
The maximum distance
between sprinklers is 14 feet (4,3 m).
The minimum distance between sprin-
klers is 10 feet (3,05 m).
Exception: When a wall or obstruction
makes a minimum spacing of 10 feet
(3,05) impossible between the line of
sprinklers along the wall and the next
adjacent line of sprinklers, the mini-
mum distance from the sprinklers lo-
cated along the wall or obstruction to
the sprinklers located on the adjacent
row can be a minimum of 7 feet (2,13
m). In this case the sprinklers located
along the wall or obstruction must be
hydraulically calculated for a 100 sq. ft.
(9,3 sq. m) coverage area or their ac-
tual coverage area, whichever is
greater.
5. Sprinkler Location:
Locate sprin-
klers with respect to the ceiling/roof in
accordance with Section 4-6.4 of FM
Global Data Sheet 2-8N.
Exception: Exception #4 to Section
4-6.1.2 of FM Global Data Sheet
2-8N does not apply to extended cov-
erage control mode sprinklers. For ob-
structed construction, when the struc-
tural members are deeper than 12
inches (300 mm) and spaced less than
42 inches (1050 mm) on center, install
sprinklers in every bay.
6. Obstructions:
Follow the obstruc-
tion requirements for standard spray
(control-mode area/density) sprinklers
in Section 4-6.5 of FM Global Data
Sheet 2-8N.
7. Other Details:
All other design de-
tails should be in accordance with FM
Global Data Sheet 2-8N, as well as any
other applicable FM Global Data
Sheet.
UL AND C-UL LISTING CRITERIA
The Model EC-25 Extended Coverage
Upright Sprinklers (SIN TY9128) are
UL and C-UL Listed for installation in
accordance with the extended cover-
age upright spray sprinkler require-
ments of NFPA 13, or other applicable
NFPA standards, when used in con-
junction with the following guidelines:
•
Suitable for the protection of ordi-
nary, extra, or high-piled storage oc-
cupancies where area/density de-
sign criterion are provided.
•
Suitable for “unobstructed” or “non-
combustible obstructed” construc-
tion.
•
The minimum flow requirements are
to correspond to the maximum de-
sign density of the applicable design
curves for ordinary, extra, or high-
piled storage hazard, using either a
12 ft. x 12 ft. (3,7 m x 3,7 m) or 14 ft.
x 14 ft. (4,3 m x 4,3 m) protection
area.
•
The maximum area of coverage per
sprinkler is 196 sq. ft. (18,2 sq. m).
The maximum distance between
sprinklers is 14 feet (4,3 m).
The
minimum distance between sprin-
klers is 8 feet (2,44 m).
•
The minimum clearance between
the deflector and the top of storage
is 36 inches (0,9 m).
Page 2 of 4
TFP213
1-Frame
2-Deflector
3-Compression Screw
4-Hook
5-Strut
6-Link Assembly
7-Button
8-Gasketed Spring Plate
9-Ejection Spring
10-Deflector Nut
FIGURE 1, MODEL EC-25 EXTENDED COVERAGE UPRIGHT SPRINKLER
OBSOLETE
