General
Description
The Model ESFR-25 Sprinklers (Ref.
Figure 1) are “Early Suppression Fast
Response Sprinklers” having a nomi-
nal K-factor of 25.2. They are suppres-
sion mode sprinklers, and their use is
especially advantageous as a means
of eliminating the use of in-rack sprin-
klers, when protecting high-piled stor-
age.
The Model ESFR-25 is primarily de-
signed for use with storage heights of
most encapsulated or non-encapsu-
lated common materials including car-
toned unexpanded plastics to 40 ft.
(12,2 m) high and with ceiling heights
to 45 ft. (13,7 m). In addition, the pro-
tection of some storage arrangements
of roll paper and rubber tires can be
considered as well.
The ESFR-25 provides the system de-
signer with hydraulic and sprinkler
placement options not presently avail-
able to the traditional ESFR sprinklers
having a nominal K-factor of 14.0. In
particular, the Model ESFR-25 has
been designed to operate at substan-
tially lower end head pressures, as
compared to ESFR sprinklers having a
nominal K-factor of 14.0. This feature
offers flexibility when sizing the system
piping, as well as possibly reducing or
eliminating the need for a system fire
pump. Also, the Model ESFR-25 per-
mits use of a maximum deflector-to
ceiling distance of 18 inches (460 mm)
versus 14 inches (360 mm); and, a
storage arrangement of 40 ft. (12,2 m)
with a ceiling height of 45 ft. (13,7 m)
does not require in-rack sprinklers as
do ESFR sprinklers having a nominal
K-factor of 14.0.
The Model ESFR-25 Pendent Sprin-
kler is also Listed by Underwriters
Laboratories Inc. (UL) and by UL for
use in Canada (C-UL) as a “Specific
Application Early Suppression Fast
Response Sprinkler” as indicated un-
der the UL and C-UL Specific Applica-
tion Design Criteria section. The spe-
cific application listing provides for re-
duced
pressure
design
for
the
protection of certain commodities.
Applications for the Model ESFR-25
Sprinklers are expanding beyond the
current recognized installation stand-
ards. For information regarding re-
search fire tests which may be accept-
able
to
an
Authority
Having
Jurisdiction (e.g., flammable liquids,
exposed plastics, and aerosols),
please contact the Technical Services
Department.
WARNINGS
The Model ESFR-25 Sprinklers de-
scribed herein must be installed and
maintained in compliance with this
document, as well as with the applica-
ble standards of the National Fire Pro-
tection Association, in addition to the
standards of any other authorities hav-
ing jurisdiction (e.g., FM Global). Fail-
ure to do so may impair the integrity of
these devices.
The owner is responsible for maintain-
ing their fire protection system and de-
vices in proper operating condition.
The installing contractor or sprinkler
manufacturer should be contacted
relative to any questions.
Sprinkler
Identification
Numbers
SIN TY9226 - (Pendent K=25.2)
TY9226 ia a redesignation for C9226,
G8441, aand S8010.
Page 1 of 4
TFP312
FEBRUARY, 2002
Model ESFR-25
Early Suppression Fast Response Pendent Sprinklers
25.2 K-factor
Technical Services:
Tel: (800) 381-9312 / Fax: (800) 791-5500
Customer Service/Sales:
Tel: (215) 362-0700 / (800) 523-6512
Fax: (215) 362-5385
TFP312 (3-1.2)
OBSOLETE
