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BSI PD 7974-4:2003

BSI PD 7974-4:2003

$167.15

Application of fire safety engineering principles to the design of buildings – Detection of fire and activation of fire protection systems. (Sub-system 4)

Published By Publication Date Number of Pages
BSI 2003 44
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This Published Document provides guidance on the development, design and application of fire detection systems, and the activation of fire alarm and fire control systems to fulfil a role in the fire safety engineered design for a building. Scientific and engineering principles are used as part of a structured approach. The key elements covered are:

  • detection: information is provided on the various types of fire detection system and their application for a given set of circumstances, as derived from a qualitative design review, risk assessment and the results of formulae provided by other Sub-systems;

  • activation and control: once the fire detection system has detected a fire, it activates a series of measures designed to fulfil the requirements of the fire safety engineered design. These measures may include operation of fire warning systems, the remote signalling to emergency services, and the operation of fire alarm, fire suppression and fire control systems. Guidance is given on the methodology and formulae required in ensuring that the appropriate systems are activated in an appropriate manner and within given criteria.

In the context of this document, fire control includes:

  • fire suppression systems: active systems designed to suppress a fire, temporarily (i.e. control) or permanently (i.e. extinguish). Examples include automatic water sprinkler systems;

  • fire barrier systems: active systems designed to contain a fire within a given area or separate a fire from another area. Such systems may be regarded as offering similar benefits to passive fire compartments or separations for the duration of their operation. Examples include fire damper systems and door release mechanisms;

  • smoke/heat control systems: active systems designed to positively control the movement and build up of fire effluents such as smoke, heat and toxic gases. Examples include smoke venting systems and air pressurization systems.

NOTE This document does not contain detailed design and installation instructions for the systems covered. This information may be obtained from other relevant British Standard codes of practice and specifications.

PDF Catalog

PDF Pages PDF Title
1 PUBLISHED DOCUMENT
2 Committees responsible for this Published�Document
3 Contents
5 1 Scope
2 Normative references
6 3 Terms and definitions
3.1 alarm receiving centre
3.2 coincidence detection
3.3 fire suppression system
4 Symbols and abbreviations
5 Design approach
5.1 The principles of fire detection
7 5.2 The principles of activation and control
5.3 Preparing a fire safety engineering design for detection and control systems
Table 1 Stage A: Fire detection
8 6 Design inputs and outputs
Figure 1 Flow chart indicating design inputs and outputs
9 6.1 Design inputs
6.2 Design outputs
7 Fire detection
7.1 Extent of coverage of detection system
10 7.2 Choice of detector
Figure 2 Fire detection characteristics diagram
11 Table 2 Failure modes for fire detection systems
13 Table 3 Response time limits of heat detectors to BS EN 54-5
Table 4 Heat detectors classification to BS EN 54-5
16 Table 5 Flame generated light wavelengths
17 7.3 Siting and spacing of detection devices
Figure 3 Detector spacing vs. time
18 7.4 Other practical considerations
19 7.5 Determination of detection response times
21 8 Activation of local and remote alarm systems
8.1 Building alarm systems
22 8.2 Remote signalling systems
23 9 Activation of fire suppression systems
9.1 Extent of coverage of suppression system
9.2 Choice of suppression system
24 Figure 4 Fire suppression system choice matrix
25 Table 6 Failure modes for fire suppression systems
26 9.3 Types of fire suppression system
27 Figure 5 Effect of suppression on rate of heat release
28 Table 7 Response time indices for sprinklers
32 10 Activation of fire barrier systems
10.1 General considerations
33 10.2 Types of barrier system
10.3 Impact on fire growth
10.4 Failure modes
11 Activation of smoke control systems
11.1 General considerations
34 11.2 Types of system
35 11.3 Impact on fire growth
11.4 Failure modes
36 12 Interactions of smoke control and suppression systems
37 13 Management of fire safety
38 Annex A (normative)
Critical path analysis for fire control and suppression systems
Figure A.1 Different processes to provide for the key objectives determined by the QDR
39 Table A.1 Example of tabulation of completion times for single paths identified in
Table A.2 Example of combining single path times to determine critical path time for
40 Annex B (informative)
Determination of heat detector spacing

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BSI PD 7974-4:2003
$167.15