Fire ventilation

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Temperature/Rate of heat release The initial stage of the fire Flashover The fully developed fire The cooling phase therefore neither will they infl uence the intensity of the fi re. In the initial stage of a fi re the fi re is normally fuel controlled, while the fully developed fi re is normally ventilation controlled. The fl ashover is therefore the transition stage from fuel control to ventilation control. What can often happen during fi re ventilation is that the conditions change from ventilation control to fuel control, or from a stage with powerful ventilation control to a stage with not so fully developed ventilation control. The temperature and development of the intensity during a complete fi re scenario. 21 Time
Page 1 and 2: T o carry out fire and rescue opera
Page 3 and 4: The content of this book may not be
Page 5 and 6: Inlets 51 Horizontal fi re ventilat
Page 7 and 8: 6 Foreword In this book fi re venti
Page 10 and 11: chapter 1 Fire ventilation The fund
Page 12 and 13: Openings to gain access to a fi re
Page 14 and 15: would be the case, for example, in
Page 16: esults in quicker and more simple e
Page 19 and 20: Pyrolysis Irreversible chemical dec
Page 21: Flashover results in a fully develo
Page 25 and 26: Reactivity Substances have differen
Page 28 and 29: chapter 4 The spread of fi re gases
Page 30 and 31: The hydrodynamic pressure, i.e. the
Page 32 and 33: We want to know how large the press
Page 34 and 35: or, expressed in terms of temperatu
Page 36 and 37: side). The negative pressure on the
Page 38 and 39: tely different direction. Very comp
Page 40 and 41: from cooking and bad/old air etc.)
Page 42 and 43: air and therefore rises upwards, wh
Page 44 and 45: Pressure differences created by the
Page 48 and 49: chapter 5 Working with fi re ventil
Page 50 and 51: The requisite size of outlets is de
Page 52 and 53: Outlets should be placed where the
Page 54 and 55: The pressure drop over the outlet i
Page 56 and 57: av Av 1 0,9 0,8 0,7 0,6 0,5 0,4 0,3
Page 58 and 59: Basement fi res can often cause a p
Page 60 and 61: tion: for example, when implementin
Page 62 and 63: The volume of fi re gases that can
Page 64 and 65: increases the risk of explosion. Wh
Page 66 and 67: 1. Prepare for fi re attack/saving
Page 68 and 69: This has, however, proved to only h
Page 70 and 71: The relationship between the size o
Page 72 and 73:
With the help of the equations 1—
Page 74:
Fog nozzle ventilation Fog nozzle v
Page 77 and 78:
76 Openings in tin plated roofs. Al
Page 79 and 80:
1. Electric cutting machine. 2. Tig
Page 81 and 82:
80 Iron bar, pincers, jimmy, crowba
Page 84 and 85:
chapter 7 Safety when working at hi
Page 86:
obvious reasons. It is mainly a que
Page 89 and 90:
Cross section of tin plated roof st
Page 91 and 92:
90 Cross section of tiled roof stru
Page 93 and 94:
Sheet metal extractor. 92 Roofs wit
Page 95 and 96:
Vents are often used as light apert
Page 97 and 98:
Examples of different systems for c
Page 100 and 101:
chapter 9 Tactics Tactics can be sa
Page 102 and 103:
mented create, together with the ac
Page 104 and 105:
103
Page 106 and 107:
chapter 10 Examples of fi re fi ght
Page 108 and 109:
To be taken into consideration in t
Page 110 and 111:
in intensity. At some point fl asho
Page 112 and 113:
Ventilation-controlled fi re In the
Page 114 and 115:
Stairwells with hot gases During ap
Page 116 and 117:
an extinguishing operation, are in
Page 118 and 119:
Lund Institute of Technology, The I
Page 120 and 121:
List of fi gures Drawn illustration
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Fire ventilation

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