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Full Description
While the risk of fire spread between buildings cannot be eliminated completely, the aim of calculating building separation distances is to ensure that ignition of a building adjacent to a fire is sufficiently delayed to allow the Fire Service to arrive on site and take preventative action.
This new edition of BR 187, in support of national building regulations, describes methods for calculating adequate space separation between buildings. Several sections, including flame projection from windows, have been expanded. Specifically, this new edition:
· gives more methods of calculation and more illustrative examples
· updates the theoretical background, including conversions to SI units
· presents detailed analysis to the methods so that users can create their own fire engineering software
· uses more recent experimental data to ensure the assumptions used in the methods are valid for modern buildings
· rigorously defines thermal radiation and associated terminology
· includes background to Methods 1 and 2 in Approved Document B.
In addition, the development of boundary distance requirements in the building regulations since World War II is described due to its relevance to redevelopment of sites containing existing buildings.
Contents
1 Introduction 2 Background and Terminology PART 1: PRINCIPLES 3 Calculation of boundary and separation distances 4 Fires in compartments -Fire growth rates -Compartment fires with suppression systems -Building use and fire loads -Transfer of heat by thermal radiation 5 Intensity of radiation from compartment fires -External flaming -External burning surfaces (cladding and paint) -Effect of thermal radiation on a building -Effect of thermal radiation on a solid -Ignition of materials in a compartment -Materials of the external surface of a building -Buildings with a suppression system -Boundary and separation distances -Summary PART 2: CALCULATION METHODS 6 Introduction to the calculation methods -Accuracy and precision -Process outline -Plane of reference -Unprotected areas -Compartmentation -Purpose group/Building use -Suppression systems 7 Determining the boundary distance -Enclosing rectangles -An 'alternative approach' to the tables -Calculation of the maximum percentage area -Calculating the minimum boundary distance 8 Using the methods in practice -CASE 1: Compartmentation -CASE 2: Simple elevation (shop front) -CASE 3: Elevation with several unprotected areas (office) -CASE 4: Non uniform unprotected areas -CASE 5: Widely spaced unprotected areas -CASE 6: Shallow recess -CASE 7: Deep recess -CASE 8: Recess with openings on sides -CASE 9: Set back 9 Fire engineering approaches -'Simple calculations' -Computer models -Zone models -Computational fluid dynamics models 10 Working tables and figures -Interpolation 11 View (configuration) factors REFERENCES APPENDIX: Evolution of 'simple' methods in AD B -Origins of the method -Evolution of the method -Checking the methods
