Bosch FAS-420-TP2 - Principles of Pipe Planning

Aspiration smoke detector LSN improved Planning | en 33
Bosch Sicherheitssysteme GmbH Operation guide 2020.04 | 6.1 | F.01U.029.275
Planning criteria Technical solution Principles Restriction
Reducing transport time Planning with acceleration
openings
Section
Standard pipe
planning, page
39
Section Planning
with acceleration
openings, page
57
Ventilation ducts Planning for forced airflow Section
Standard pipe
planning, page
39
Section Planning
for forced airflow,
page 67
With regard to the planning regulation below, the applicable national regulations of the
countries concerned must be observed and the plans modified accordingly.
EN 54‑20 or ISO 7240‑20
For VdS systems, compliance is also required with the following guidelines:
– "Guideline for automatic fire detection systems, planning and installation", VdS
Schadenverhütung GmbH, Cologne (VdS2095)
– The guideline "Installation protection for electrical and electronic systems" VdS
Schadenverhütung GmbH, Cologne (VdS2304)
– The "Planning Aspirating Fire Detectors" data sheet from VdS Schadenverhütung GmbH,
Cologne (VdS 3435)
The applicable national regulations must also be observed, for example in Germany:
– DIN VDE0833 parts1 and 2 "Alarm systems for fire, intrusion and hold-up"
– Additional provisions for the installation of fire detection systems, which are published by
fire directors of fire departments, by the construction supervision authorities or by the
construction law authorities that have only local validity.
Notice!
For planning, the system limits in accordance with Planning Limits are to be observed.
Select airflow monitoring and the associated planning limits (see Airflow Monitoring) and
check these for any restrictions imposed by country-specific regulations.
If the on-site planning deviates from the standard plans described below, this must always be
checked with activation attempts for correct detection of a malfunction and a fire. A special
plan may be required.
Plans not contained in the operation guide must be requested.
4.2 Principles of pipe planning
The aspiration pipe network must be designed such that all possible fires in the monitoring
area can be dealt with at an early stage.
The number of air sampling openings and the structure of the pipe system depend on the size
and geometry of the monitoring range. The pipe system must be laid out according to the
planning guidelines in this chapter, taking into account the following issues:
Symmetrical structure
The pipe system should preferably have a symmetrical structure, i.e.
– Same number of air sampling openings per pipe branch
– Same pipe branch lengths (should not exceed ±20% deviation)
– Same distance between neighboring air sampling openings on the smoke aspiration pipe
(should not exceed ±20% deviation).
Asymmetrical structure