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74
en | Planning
Distances of apertures
The distance between the T-piece and the following branch pipe as well as the pipe length
between aspiration apertures on the branch pipes must not exceed 12 m in total.
FAS / FCS
Maximum length of branch pipe
The length of pipe between the last T-piece and the last aspiration apertures is the length of
branch pipe. All other branch pipes need to be shorter. Two aspiration apertures in total can
be projected on each branch pipe.
If the maximum distance is exceeded a correction by an additional aspiration aperture on a
branch pipe can be done. In this connection please notice that two aspiration apertures in
total can be projected on each branch pipe.
4.13
Planning with air sampling hose
The application of air sampling hose FAS-ASD-PHF16, PG16 can be useful if several direction
changes on a short distance of a pipe system is required, e. g. for avoiding any obstacles.
As the transport time can be manipulated negatively by application of an air sampling hose,
the influence of the used air sampling hose is to be deter-mined on the allowed total length of
pipe as follows.
Consideration during application of air sampling hose:
For calculation the maximum length of air sampling pipe with air sampling hose, the length of
the air sampling hose must be multiplied by the certain factor b and deducted from the
allowed total length of pipe.
Air sampling pipe length = Total pipe length – (Length of the air sampling hose * factor b)
Factor for calculation of the air sampling hoses length:
Fan voltage
6,5 V
6,9 V
≥ 9 V
Example 1: Altogether, the air sampling hose of type FAS-ASD-PHF16 with a length of 22 m
shall be connected to a FAS/FCS aspirating smoke detector with a fan voltage of 6.9 V. The
allowed total length of pipe is 120 m. The result for the maximum air sampling pipe inclusive
air sampling hose is:
Air sampling pipe length = 120 m – (22 m * 0.6) = 106.8 m.
Example 2: In case of a pipe project planning, 100 m of air sampling pipe and air sampling
hose shall be connected to a FAS/FCS aspirating smoke detector with a fan voltage of 6.5 V. In
accordance to the project planning scale, the allowed total length of pipe can be 120 m for the
2018.04 | 2.0 | F.01U.130.926
Factor b
0,9
0,6
0,7
Operation Guide
Aspirating Smoke Detector
Bosch Sicherheitssysteme GmbH
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