PE Problem #85

10/1/2018

If, during a fire, a total occupant load of 185 people are exiting through a building's main entry (a 7-foot double door with an effective width of 6.5 ft) and the density near the main exit door results in about 0.25 persons/sqft, the time (in minutes) it would take for all of these occupants to exit the main doors is most nearly:
a. 1.3 min
b. 1.4 min
c. 2.0 min
d. 5.7 min

Solution | Posted 10/02/18

6 Comments

10/1/2018 08:28:44 am

B. Reading that graph definitely leaves me room for error.

Pari

10/1/2018 11:33:39 am

B, Meyer Fire Section 4.11

EdwH

10/1/2018 11:33:41 am

FPH 4-60

Fs = (1-aD)kD = (1-2.86x0.25)x 275 x 0.25 = 19.59
Fc = Fs x We = 19.59 x 6.5 = 127.36

Tp = P / Fc = 185 / 127.36 = 1.45 minutes === b.

This took more than 6 minutes !!!

Colleen

10/1/2018 09:28:06 pm

I got the same answer! Used HFPE p. 2125-2126 though.

David

10/1/2018 01:56:07 pm

I used Figure 4.2.7 FPH to get 20.
20 x 6.5 = 130
185/130 = 1.42 minutes.

Brian

10/1/2018 05:50:02 pm

B. SFPE 5:2127 fig. 59.8
To get Fs .25 =>20
Fs=(1-aD)kD (eq. 59.7)
Fs=(1-2.86*.25)275*.25
Fs = 19.59
Fc=FsWe =19.59*6.5=127.359
t=P/Fc
t=185/127.359
t=1.45

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