BSI PD 7974-1:2019
$189.07
Application of fire safety engineering principles to the design of buildings – Initiation and development of fire within the enclosure of origin (Sub-system 1)
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 48 |
This Published Document provides guidance on evaluating fire growth and/or size within the enclosure of fire origin, as well as enclosures to which the fire has subsequently spread.
The characteristics and products of the design fire for any particular scenario are influenced by a number of factors, including building design, environmental influences, potential ignition sources and location, types of combustible materials, distribution and arrangement of combustible materials, ventilation conditions and other events occurring during the fire.
The determination of the characteristics and products of the design fire from ignition through to decay is used by other sub-systems.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 7 | Introduction 1 Scope 2 Normative references |
| 8 | 3 Terms, definitions and symbols |
| 12 | 4 Design approach 4.1 Uncertainty 4.2 Competence 4.3 Framework |
| 13 | 4.4 Design assessment and basis of design fire selection 4.5 Building characteristics 4.6 Fuel load characteristics |
| 14 | 4.7 Environmental influences 5 Inputs Figure 1 — Sub-system 1 inputs 6 Outputs |
| 15 | Figure 2 — Sub-system 1 outputs 7 Classification 7.1 General 7.2 Ignition |
| 16 | 7.3 Flame spread 7.4 Fire growth Figure 3 — Conceptual illustration of continuous fire growth 7.5 Fully developed |
| 17 | Figure 4 — Fire growth in an uncontrolled room fire |
| 18 | Figure 5 — Illustration of a travelling fire and ceiling jet [1] 7.6 Decay 7.7 End stage |
| 19 | 8 Design calculations 8.1 General concepts/principles 8.2 Ignition |
| 20 | 8.3 Characteristics of flames |
| 21 | Table 1 — Empirical correlations |
| 23 | 8.4 Fire growth Table 2 — Standardized alpha t-squared growth rates |
| 24 | Table 3 — CT constants for different configurations |
| 25 | 8.5 Fully-developed fires (inclusive of decay) |
| 29 | Figure 6 — Two indicative travelling fire arrangements with fire travel path lengths and path widths |
| 30 | 8.6 Post-flashover fires (inclusive of decay) |
| 31 | Figure 7 — Example gas time-temperature curves for post-flashover fires as a function of opening factor and fire load density with normal enclosure linings 8.7 Nominal time–temperature curves |
| 32 | 8.8 Production of species |
| 35 | 8.9 Activation of heat detector devices and automatic fire suppression systems 8.10 Effect of automatic fire suppression systems on fire conditions |
| 36 | Annex A (informative) Reference data Table A.1 — Convective fractions for different fuels [12] Table A.2 — Standardized fire growth rates [BS ISO/TR 13387‑2] Table A.3 — Fire growth rates for some discrete fuel assemblies |
| 37 | Table A.4 — Heat release rates per unit area for different occupancies [41] Table A.5 — Fire load density for different occupancies |
| 38 | Table A.6 — Effective emission co-efficient, K, for various materials Annex B (informative) Reference data for smoke and toxic gas yields Table B.1 — Composition of test materials |
| 39 | Table B.2 — Toxic gas yields, effective heats of combustion and oxygen consumption under well-ventilated and under-ventilated combustion conditions for a range of common polymeric materials from the PD ISO/TS 19700 tube furnace [34] |
| 40 | Table B.3 — Smoke mass conversion factor [56] |
| 41 | Table B.4 — Ranges of carbon monoxide yields, smoke particulate yields, smoke specific extinction areas and mass optical densities for cellulosics and plastics under well-ventilated and under-ventilated flaming combustion |
| 42 | Table B.5 — Carbon monoxide yields, smoke particulate yields, smoke specific extinction areas and mass optical densities for well-ventilated combustion from Tewarson [57] and Mulholland [35] |
| 43 | Annex C (informative) Example configuration factors |
| 44 | Bibliography |
