PE Problem #71

9/11/2018

If the relationship below describes the growth phases of fire, what point does the arrow indicate?
a. ignition
b. ceiling jet creation
c. flashover
d. growth

Solution | Posted 09/12/18

7 Comments

9/11/2018 08:39:18 am

C, fig 3.7.1 (19th)

Monday

9/11/2018 10:59:34 am

Colleen

9/11/2018 10:25:43 am

Without knowing where "proof" would be in one of the handbooks, my answer is C. flashover.

D can be eliminated right off the bat, because growth doesn't make sense with a point on a graph where the line goes flat and doesn't change.

For A, I would think ignition would start at time 0

David

9/11/2018 10:43:55 am

Pari

9/11/2018 11:31:24 am

C , SFPE, Figure 3-6.1

FPE

9/12/2018 03:02:34 am

c. flashover

Douglas Krantz link

9/17/2018 05:26:44 am

The graph shows the room temperature during the cycle of a fire. The air temperature is measured, and because the air is in contact with the materials, the surface temperature of all the materials in the room follow closely the air temperature

When the air temperature reaches the flashover point, the temperature that will sustain fire, everything in the room starts to burn. For each type of material, this temperature will actually be a little different.

Something like a half a century ago, a science fiction book “Fahrenheit 451” referred to this effect as it talked about “book burning”.

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