PE Problem #43

8/5/2019

A liquid storage tank rupture results in a fire containing an open 45 gallon (130 kg) tank containing animal fat. Using gross heat of combustion, estimate the time it would take to burn the remaining fuel without interruption if the tank is half filled and the fire is approximately 2.45 MW.
a. 1.2 seconds
b. 11 minutes
c. 18 minutes
d. 17.6 hours

Solution | Posted 08/06/19

3 Comments

Jack

8/5/2019 08:53:27 am

Table A.32 of SFPE HB:
Gross hc of animal fat = 39.8 MJ/kg

Fire size = 2,450 kW = 2.45 MW

2.45 (MJ/s) / 39.8 MJ/kg = 0.061 kg/sec --> 3.69 kg/min

The tank is half full, so its contents is 0.5(130) = 65 kg.

65 kg / 3.69 kg/min = 17.6 min --> 18 min

C

Amr

8/5/2019 11:05:22 am

C. 18 minutes

MeyerFire eq. 2.16
FPH P 6-280

9/16/2019 12:28:08 pm

Free Signup

Subscribe and learn something new each day:

Community

Thank You to Our Top
April 2020 Contributors!

1. Mike
2. Sean
3. Franck
4. Dan W.
5. Jonathan

6. Jesse
7. Wayne
8. Jonathan J
9. James
10. Thomas

Your Post

SUBMIT A QUESTION

The Toolkit

Sprinkler Designer or Engineer?

Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:

FREE 30-DAY TRIAL

GET THE TOOLKIT

Filters

Exam Prep

2019 PE Prep Guide
(Available Now!)

PE Prep Series
(Available Now!)

Current Leaderboard
(Click to enlarge)

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 © 2020 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.