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4
Planning
Designing the pipe system
4.3 Designing the pipe system
4.4 Planning the pipe system
28 | 48
Take the following into account for an effective design:
●
Pipe length
●
Number of aspirating holes
●
End cap hole
●
Number and radius of bends
●
Number of pipes
●
Length of capillary tubes
●
Size of bends and branches
●
Differences in air pressure
●
How the total airflow is split into separate airflows for each pipe
●
Equalization of airflows in the pipes
●
Response time, i.e., the time it takes to transport air to the aspirating smoke
detector from aspirating holes that are far away
●
Sensitivity of the aspirating holes
●
Total power of the system including all components
●
End caps with holes 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
software 'FXS2056 ASD Asyst‑Tool V3')
●
The air return pipe must be kept as short as possible so as not to impair the
aspirator.
w
You are familiar with the function of the aspirating smoke detector and the local
conditions.
◈
Spread the aspirating holes throughout the room like the nodes in a network.
–
Typical mesh sizes are 3 x 3 m, 4 x 4 m, and 6 x 6 m.
–
The maximum gap (A) from the wall to the nearest aspirating hole is
defined in local regulations and guidelines.
–
The maximum gap (B) between two aspirating holes is 10 m.
A
B
B
Fig. 11: Planning the pipe system
a The network of aspirating holes has been created.
A6V11783979_en--_a
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