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

Free Signup

Subscribe for posts on PE Problems and Daily Discussions, straight to your inbox, for free:

Community

Thank You to Our Top November Contributors:

1. Dave L.
2. Mike
3. Wes
4. Peter
5. Wayne A.

6. Scott M.
7. Robert
8. EdwH
9. Diaa
10. RJ

Your Post

Ask your question here (members area)

Search

All-Access

Get all-access to the downloadable Toolkit, Sprinkler Database, Ask-A-Question and more.

ALL-ACCESS

Filters

Exam Prep

2018 PE Prep Guide

Weekly Practice Exams

PE Problems

Visit July-October for daily Fire Protection PE Exam sample questions.

Solutions are posted the day after posting.

Comment with your solutions, questions or clarifications.

Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves.

RSS Feed

Home - About - Blog - Contact - Exam Prep - Store

Copyright © 2018 MeyerFire, LLC
The views, opinions, and information found on this site represent solely the author shown and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a commission for orders placed elsewhere.