TFP802
Page 2 of 6
Design
Criteria
Nozzle Placement.
Where direct im-
pingement of water spray onto all of
the protected surface is required by
the authority having jurisdiction, the
nozzles are to be spaced and directed
so that their spray patterns will com-
pletely cover the plane-of-protection
with the minimum required average
density; however, it is recommend-
ed that indoor nozzle spacing be 12
feet (3,7 m) or less and that outdoor
nozzle spacing be 10 feet (3,0 m) or
less. Where rundown or slippage is
planned, such as, exposure protec-
tion of vessels per NFPA 15, the above
rec
ommended indoor and outdoor
spac ings also apply.
When used for protecting the surfaces
of a vessel, for example, the nozzles
are positioned normal to and approxi-
mately 2 feet (0,6 m) from the surface.
This approach, in conjunction with
a properly selected spray angle, will
tend to make more effective use of the
spray as well as help minimize the dis-
turbance effects of wind/draft condi-
tions on the water spray patterns.
Spray Patterns.
The Design Spray
Profiles for the nozzle spray angles of
65 to 180 degrees are shown in Fig-
ure 2 and apply to discharge pres-
sures of 20 to 60 psi (1,4 to 4,1 bar).
Discharge pressures in excess of 60
psi (4,1 bar) will result in a decrease
in coverage area since the spray pat-
terns tend to draw inwards at higher
pressures. Refer inquiries on higher
discharge pressures to the Technical
Services Department. The maximum
axial distances between the nozzle tip
and plane-of-protection, for exposure
protection, are given in Table C and D.
When the axial distance from the noz-
zle tip to the plane-of-protection is 2
feet (0,6 m) or less, the Design Spray
Profile is the same as the nominal
spray angles of 65 thru 140 degrees.
Main Pipeline Strainers.
Main pipe-
line strainers per NFPA 15 are required
for systems utilizing nozzles with a
flow path less than 3/8 inch (9,5 mm)
diameter, i.e., No. 16 thru No. 24 (Ref.
Table A), and for any system where the
water is likely to contain obstructive
material.
Installation
The TYCO Type D3 Protectospray
Nozzles must be installed in accor-
dance with this section.
General Instructions
A leak-tight 1/2 inch NPT nozzle joint
should be obtained by applying a min-
imum to maximum torque of 7 to 14 ft.
lbs. (9,5 to 19,0 Nm). Higher levels of
torque may cause impairment of the
nozzle.
Step 1.
With pipe-thread sealant ap-
plied to the pipe threads, hand tighten
the nozzle into the nozzle fitting.
Step 2.
Tighten the nozzle into the
nozzle fitting using only the W-Type 11
Sprinkler Wrench (Figure 3). With ref-
erence to Figure 1, apply the W-Type
11 Sprinkler Wrench to the wrenching
area.
65°
80°
95°
110°
125°
140°
160°
180°
ORIFICE
SIZE
MINIMUM
DIAMETER
K-FACTOR
GPM/psi
1/2
LPM/bar
1/2
NO. 16
0.203” (5,16 mm)
1.2
17,3
NO. 18
0.250” (6,35 mm)
1.8
25,9
NO. 21
0.281” (7,14 mm)
2.3
33,1
NO. 24
0.328” (8,33 mm)
3.0
43,2
NO. 28
0.375” (9,53 mm)
4.1
59,0
NO. 32
0.438” (11,13 mm)
5.6
80,6
NO. 34
0.500” (12,70 mm)
7.2
103,7
AREA
WRENCHING
2-1/2"
(63,5 mm)
(44,5 mm)
1-3/4"
2-1/16"
(52,4 mm)
1/2" NPT
PIN
DEFLECTOR
SPLITTER
FRAME
NOMINAL MAKE-IN
7/16" (11,1 mm)
ORIFICE SIZE
STAMPED ON
WRENCHING
AREA
DEFLECTOR
STAMPED ON
(INCLUDED ANGLE
SPRAY ANGLE
OF DISCHARGE)
FIGURE 3
W-TYPE 11
SPRINKLER WRENCH
TABLE B
SELECTION OF SPRAY ANGLES
TABLE A
SELECTION OF ORIFICE SIZES
FIGURE 1
TYPE D3 PROTECTOSPRAY NOZZLES
NOMINAL DIMENSIONS
