Tyco Fire Suppression & Building Products ANSUL AQUASONIC, Design, Installation, Recharge, And Maintenance Manual

Page: 49 / 141

SECTION II
3-1-2010 Page 2-5
SYSTEM LIMITATIONS (Continued)
Obstruction Allowances (Continued)
Obstructions that eclipse the discharge path may obstruct
up to 42% of the discharge path, and must be 3 in. (7.6 cm)
or more from the centerline of the discharge path. See
Figure 4.
FIGURE 4
008255
An atomizer may be more than 42% obstructed if the
obstruction is not closer than 9 ft 10 in. (3.0 m) away,
provided the following conditions are met:
• Not more than 25% of the number of atomizers may be
more than 42% obstructed.
• Total obstruction of all atomizers cannot exceed 42% of
the total atomizer discharge area.
Obstructions may have either flat surfaces or curved
surfaces that are convex, but may not consist of a surface
or group of surfaces that form a gutter or channel that
would capture the flow of atomized water droplets. See
Figure 5.
FIGURE 5
008256
Obstructions that are parallel to the direction of discharge,
such as a post, beam, or pipe may not be closer than 1 ft
(30 cm) from the centerline of the discharge path. See
Figure 6.
FIGURE 6
008257
General Information
32 IN.
(61 cm)
32 IN.
(61 cm)
WORK
BENCH WORK
BENCH
3 IN.
(7.6 cm)
3 IN.
(7.6 cm)
7 IN.
(18 cm)
ALLOWED NOT ALLOWED
5 IN.
(13 cm)
1 IN.
Ø 8 IN. (20 cm)
ROUND 27%
OBSTRUCTION
Ø 8 IN. (20 cm)
ROUND 42%
OBSTRUCTION
PLAN VIEW
BEAM
POST
SIDE WALL MOUNTED PENDANT MOUNTED
1 FT (30.5 cm)
OR GREATER
1 FT (30.5 cm)
OR GREATER