Pipe System - Siemens FDA241 Planning, Mounting

4.9 Pipe system

Building Technologies
Fire Safety
It is important that the pipe system ensures reliable detection of a fire.
The example below shows pipe systems with 3 aspirating holes/6 aspirating holes
and a symmetrical/asymmetrical arrangement. The diameter of the aspirating holes
and the openings in the end caps are calculated using the 'FXS2056 ASD Asyst
Tool V2' software. This ensures a balanced airflow within the pipe system.
2.5 mm
2.5 mm 2.5 mm
2.5 mm
2.5 mm 2.5 mm
3.4 mm 3.6 mm 3.8 mm
2.5 mm
2.5 mm 2.5 mm
Figure 10: Example of symmetrical and asymmetrical pipe systems with details of aspirating hole
diameters
Symmetrical layout
Preferably, you should select a symmetrical layout.
Advantages:
Same number of aspirating holes per pipe branch
All pipe branches are the same length (tolerance ±10 %)
Same distance between neighboring aspirating holes (tolerance ±10 %)
Asymmetrical layout
The structural conditions may make it necessary to use an asymmetrical layout.
Conditions:
As regards the number of aspirating holes in the shortest and the longest pipe
branches, there is a minimum ratio of 1:2, which must not be undershot.
The distance between neighboring aspirating holes should always be the same
(tolerance ±20 %).
The diameter of each aspirating hole must be determined using the
'FXS2056 ASD Asyst Tool V2' software and is dependent on the total number
of aspirating holes in the pipe branch.
Longer supply lines
If longer supply lines are required between the aspirating smoke detector and the
pipe system, the maximum permissible pipe length must not be exceeded as a
result.
3.0 mm
2.5 mm 3.0 mm
3.0 mm
2.5 mm 3.0 mm
3.0 mm
2.5 mm 3.0 mm
Planning
4
Pipe system
3.2 mm
3.2 mm
3.2 mm
37 | 56
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2017-09-12