Designing The Pipe System; Planning A Pipe System For Aspirating Smoke Detectors - Siemens FDA241 Planning, Mounting

4.4 Designing the pipe system

4.5 Planning a pipe system for aspirating smoke
Building Technologies
Fire Safety
To ensure an effective design, consider the following points:
Pipe length
Number of aspirating holes
Size of end caps
Number and radius of bends
Number of pipes
Length of capillary tubes
Size of bends and branches
Air pressure differences
Division of overall airflow into airflows per pipe
Equalization of airflows in pipes
Response time as a measure of how long it takes for the air to be carried from
distant aspirating holes to the aspirating smoke detector
Sampling Hole Sensitivity
Overall performance of the system with all components
End caps with openings at the end of the pipes are used to adjust the airflow
Filter box and its effect on the airflow (must be taken into account in the
'FXS2056 ASD Asyst Tool V2' software)
detectors
The planner is familiar with the function of the aspirating smoke detector and
the local situation.
Distribute the aspirating holes across the room as if they were nodes in a
network.
– Typical mesh sizes are 4 x 4 m, 6 x 6 m, 3 x 3 m.
– The maximum distance (A) between the wall and the next aspirating hole is
5.1 m.
– The maximum distance (B) between two aspirating holes is 10 m.
You have created a network of aspirating holes.
A B B
Planning
Designing the pipe system
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2017-09-12
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