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TFP852

Page 3 of 6

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-17 Nozzle is provided in 

Graph A.

Design 

Criteria

The TYCO Model TN-17 K=16.8 Hori-

zontal 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-17 Nozzle must be 

installed in a horizontal orientation. See 

Figures 1 and 3.

Non-continuous suspended obstruc-

tions such as air handlers, lights, and 

the like are to meet the “4x rule” of 

Figure 7; 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-17

NOZZLE

16'-4"

(5,0 m)

NOZZLES

AND

FITTINGS

SHOWN

ENLARGED

16'-4"

(5,0 m)

COVERAGE

AREAS

ADJACENT

COVERAGE

AREAS

FIGURE 4 

MODEL TN-17 HORIZONTAL SPRAY NOZZLE 

COVERAGE AND SPACING – PLAN

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