name of the building       identification of the compartment           variant 2
Potential risk calculation Variant 2 can be used for an alternative proposition, e.g. improving the fire resistance
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DATA Symbol Unit  P - REF CHANGING DATA CHANGED Change ?[1] Variant 2
VALUES Comments[2]
Fire load factor q.[3]                  
Immobile (building) fire load density: Qi MJ/m²[4] 100 B. Incombustible construction, with max. 10% allowance for combustible construction elements as windows, roof covering, etc. 100 0[5] 100 no 100  
Mobile (moveable) fire load density Qm MJ/m² 600 d. Ordinary fire hazard with high fire load (OH3 / NFPA OH Gp2+) 2000   2000 yes 2000  
      1,35 The calculated value of q is = q = 1,66   1,66
Fire spread factor i.[6]      
Temperature rise T[7] INFO P 250 d. Average content of residential buildings  (482°F) 250 200[8] 200 no 250  
Average dimension of content  m[9] INFO P 1,00 Define m: average dimension of content (see info P or enter value in column F) 0,10 0[10] 0,10 no 1,00  
Reaction to fire class of surfaces[11] M INFO P 2,5  WEIGHTED AVERAGE of the following classes (link to Info P)[12] 2,5   2,5 no 2,50  
      1,00 The calculated value of i is : i = 1,15   1,00
Area factor g      
Theoretical length l m 50 Define the longest distance between the centres of two sides of the compartments' perimeter. This is the theoretical length l.   50 50 no 50,00  
Total compartment area Atot m² 2000 Define the total surface area of the compartment   2000 2000 no 2000,00  
Equivalent width  b m 40 Divide this area by the theoretical length to obtain the equivalent width b.     40 no 40,00  
Frontage[13]     long Building accessible at its long side long   long no long  
    INFO P 1,28 The calculated value of g is : g = 1,28   1,28
Venting factor v      
Mobile (moveable) fire load density Qm MJ/m² 600 The mobile fire load Qm, which is already entered, is used here.     2000 yes 2000,00
STEP 1 : Floor to ceiling height[14] h m 4 Define the average height between floor and ceiling in the compartment.   4 4 no 4,00  
Smoke venting ratio STEP 2 m² 3 Total area of single glazed windows, glass and plastic skylights in the ceiling (roof) and upper third op the walls giving to the outside.[15]   10 3 no 3,00  
  STEP 3 m² 10 Measure the aerodynamic area of static smoke vents in m²   10 10 no 10,00  
    m² 0[16] Nominal flow of mechanical (smoke) ventilation systems[17] m³/h 0 0 no 0,00  
    m² 2000 Total area of compartment 2000 ratio 0,007 no 0,007
  k 0,007 Estimated smoke venting ratio k  ( if not calculated) k = 0%[18] 0% no 0,007  
  Effective smoke venting ratio k: 1% 0,007
    INFO P 1,00 The calculated value of v is: v = 1,06   1,06
Level factor e      
Level[19] E   0 Mezzanines and platforms : add decimal value to level number   0,00 0,00 no 0,00  
    INFO P 1,00 The calculated value of e is: e = 1,00   1,00
Access factor z      
The number of access directions[20] Z   3 The number of accessible directions is Z (1 to 4).   3 3 no 3,00  
Height difference[21] H m 0 Height difference in meter (positive or negative)  25 0 0 no 0,00  
  b   40 already entered for factor g     40    
    INFO P 1,00 Access factor z z = 1,00   1,00
Potential Risks      
        Potential risk values for :   variant 2      
Fire load factor q. q 1,66   property (building and content) P 2,25    
Fire spread factor i. i 1,00   occupants (people) P1 1,76   Date of this analysis
Area factor g g 1,28   activities P2 1,35    
Level factor e e 1,00       date(s) of the analysis
Venting factor v v 1,06        
Access factor z z 1,00                
[1]
Changes are only accepted for variant 2 if confirmed (=YES) in this field
[2]
Motivate your selection here.
[3]
Fire load factor q is calculated with the value of the fire load density, indicating  how much energy can be released per area unit. The total fire load density can be defined as the sum of the 'immobile' fire load density Qi, made up by the building elements, and the 'mobile' fire load density Qm of its content.
[4]
100 BTU/sq.ft. equals 1 MJ/m² ;
 1kg wood / m² equals  appr. 15 MJ/m²
[5]
User defined input or correction
[6]
Fire spread factor i indicates how easy a fire can spread through a building. It is calculated from the average dimension of the content m (in meter), the flame propagation class M of the surfaces, and the temperature rise T necessary to ignite or damage the content.
[7]
T is the temperature rise that the content of a compartment can sustain before it is damaged or ignited. E.g.  when the 'content' is human beings a temperature rise of more than 100 °C (180°F ) is not tolerable.
[8]
user defined input here : accepted if lower value
[9]
Examples: m = 0.3 (equal to 1 ft) for most objects in our daily environment; palletised storage of goods: m = 1 meter (3ft), in industries producing smaller objects: m = 0.1 meter(4 inch)
[10]
User defined input > 0 overrides value in column F

[11]
The more flammable the surfaces of the content, the easier a fire will spread. To typify the fire propagation on the surfaces, 6 fire spread classes are used, taking into account packaging and decoration materials.
[12]
Go to sheet "info P" to make a weighted average
[13]
Fire fighting operations are much more difficult when a building is only accessible from its narrow side
[14]
Define the height h, between the floor and the ceiling of the storey. For a sloping roof or ceiling, it is the average height that is used.
[15]
Only these building elements can contribute to the "fire induced"  escape of smoke and heat.
[16]
Equivalent area: 10000 Nm³/h = 1m²
[17]
These systems must be designed to permit smoke removal
[18]
Enter here an estimated value as % of the  floor area to override the previous data
[19]
Number all the levels in the following way: E =0 for the main access level. All upper levels are then E = 1,2,3, etc. All underground levels are then E= -1, -2, -3, etc.
[20]
To define Z, the number of access directions, draw an imaginary map of the building with the north at the main entrance of the building, and check the south, east and west for free access for the fire brigade.
[21]
To define H+ or H-: Look at the fire brigades' way towards the fire. Upwards is H+ the vertical distance from the access level to the floor level of the compartment.  Downwards: H-, the negative value of the distance from access level to the basement floor.