TFP850
Page 3 of 6
Design
Criteria
The TYCO Model TN-25 K=25.2 Hor-
izontal Spray Nozzle is intended for
integration into a water spray, deluge
fire protection system designed in
accordance with the applicable stan-
dards recognized by any authorities
having jurisdiction.
Nozzle Orientation
The Model TN-25 Nozzle must be
installed in a horizontal orientation.
See Figures 1 and 3.
Corrosion Resistance
It is recommended that the Tunnel
Operator be consulted with respect
to the suitability of the materials of
construction and finish for any given
corrosive environment. The effects of
ambient temperature, concentration of
chemicals, and gas/chemical velocity,
should be considered, at a minimum,
along with the corrosive nature to which
the nozzles may be exposed.
The pipe, fittings, hangers, and hanger
components must be suitable for use in
the application environment.
Obstructions
The maximum allowable vertical and
horizontal distance that the bottom of
an obstruction can be away from the
Model TN-25 Nozzle is provided in
Graph A.
Non-continuous suspended obstruc-
tions such as air handlers, lights, and
the like are to meet the “4x rule” of
Figure 6; within 5 ft (152,4 cm) of the
nozzle deflector in the area below the
nozzle, the obstruction must be located
four (4) times the longest dimension of
the obstruction as defined in Figure
6, to a maximum of 60 in. (152,4 cm).
No obstructions are allowed to be
located within the designated shaded
region. Care must be taken to place
large obstructions running parallel to
the nozzle discharge, such as signs, in
the areas between the nozzles.
TN-25
NOZZLE
NOZZLES
AND
FITTINGS
SHOWN
ENLARGED
COVERAGE
AREAS
ADJACENT
COVERAGE
AREAS
7 psi (0,5 bar)
14'-0" (4,3 m)
-or-
10 to 30 psi
(0,7 to 2,1 bar)
16'-4" (5,0 m)
7 psi (0,5 bar)
14'-0" (4,3 m)
-or-
10 to 30 psi
(0,7 to 2,1 bar)
16'-4" (5,0 m)
FIGURE 4
MODEL TN-25 HORIZONTAL SPRAY NOZZLE
COVERAGE AND SPACING – PLAN
