System Design
July 2018
3-20
06-237518-001
3-17.2
Nozzle Selection and Placement
Use the Kidde IGS Flow Calculation software to determine the required orifice area and nozzle
size. There are two Kidde IGS nozzle configurations:
•
The 360° nozzle provides a full 360° discharge pattern designed for placement in the centre
of the hazard.
•
The 180° nozzle provides a 180° discharge pattern designed for placement adjacent to a
side wall of the hazard.
The maximum orifice area to pipe area ratio must conform to the following:
•
The ratio between the nozzle orifice area for a 360° nozzle at the given node and the pipe
cross sectional area for the pipe segment preceding that nozzle is 0.85, or 85%.
•
The ratio between the nozzle orifice area for a 180° nozzle at the given node and the pipe
cross sectional area for the pipe segment preceding that nozzle is 0.85, or 85%. Due to
geometric constraints and the need to keep a sharp-edged orifice, in sizes up to and includ-
ing 3/4 in NPT (19 mm), the 180°
sidewall nozzle has a lower ratio of orifice area to feed
pipe area. This value is different for each size nozzle through 3/4 in (19 mm) NPT.
The minimum orifice area to pipe area ratio must conform to the following:
•
The ratio between the nozzle orifice area for a 360° nozzle at the given node and the pipe
cross sectional area for the pipe segment preceding that nozzle is 0.20, or 20%.
•
The ratio between the nozzle orifice area for a 180° nozzle at the given node and the pipe
cross sectional area for the pipe segment preceding that nozzle is 0.20, or 20%.
Nozzles are available in nominal pipe sizes of 1/2 in, 3/4 in, 1 in, and 1-1/2 in (13mm,
19mm, 26mm, and 38mm). Nozzles are available in NPT or BSP fittings.
3-17.2.1 Nozzle Placement
There are certain coverage and height limitations which must be observed with each nozzle
configuration to ensure proper Agent distribution.
Figure 3-5. Nozzle Placement and Coverage
•
Orientation
-Nozzles must be mounted perpendicular to the ceiling or subfloor surface and
oriented with the orifices radiating outward from the pipe network. Pendant or upright
mounting of the nozzle is acceptable.
10.8 m
(35.5 ft.)
10.8 m
35.5 ft.
(
)
180° Nozzle
360° Nozzle
d =
(
)
12.08 m
39.6 ft.
10.8 m
35.5 ft.
(
)
10.8 m
35.5 ft.
(
)
d =
(
)
7.64 m
25.07 ft.
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