Table of Contents
Advertisement
Aspirating Smoke Detector
Planning criteria
Reducing transport time
Ventilation ducts
EN 54‑20 or ISO 7240‑20
For VdS systems, compliance is also required with the following guidelines:
–
–
–
The applicable national regulations must also be observed, for example in Germany:
–
–
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.
–
–
–
Asymmetrical structure
If structural circumstances dictate that the pipe system is to be designed asymmetrically, the
following conditions apply:
–
Bosch Sicherheitssysteme GmbH
Technical solution
Planning with acceleration
openings
Planning for forced airflow
"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)
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.
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).
The number of air sampling openings and the length of the shortest and longest pipe
branch within the pipe system must not exceed a quantity ratio of 1:2.
Operation Guide
Planning | en
Principles
Restriction
Section
Section Planning
Standard Pipe
with Acceleration
Planning
Openings, page
59
Section
Section Planning
Standard Pipe
for Forced Airflow,
Planning
page 69
2018.04 | 2.0 | F.01U.130.926
33
Advertisement
Table of Contents
