PE Problem #91

10/9/2018

A project site is connected to a water tank through an equivalent 650 feet of 6-inch schedule 10 pipe (c-factor of 140). If the water tank is 165 feet above the project site, the fire flow available at the project site is most nearly:
     a. 1,300 gpm
     b. 2,100 gpm
     c. 2,400 gpm
     d. 8,700 gpm

Solution | Posted 10/10/18

10 Comments

Vince

10/9/2018 08:19:21 am

1,300 @ 49.39

Jimmy

10/9/2018 06:24:02 pm

A. My logic would be to say Pt=71.46psi. Pv + Pp at the given flows are 23.4 psi, 56.7 psi, 73 psi and 748 psi. What's the required delivery pressure? You end up @ 54psi, 17.5psi, 0, & impossible. Any answer below 54 psi won't spray for beans--not exactly useful to fight a fire, right?

FPE

10/9/2018 10:05:47 am

c. 2,400 gpm,
Ref - convert 165 feet head to psi and use Hazen William formula to find out Q

Pari

10/9/2018 11:08:45 am

C ,2400 gpm

Vince

10/9/2018 12:43:32 pm

Friction loss in 650 ft of 6" @ 140 =22.22 psi. Doesn't that play a part here?

migdalia guzman

10/9/2018 11:47:27 am

C, 2400 GPM

MHK

10/9/2018 07:32:52 pm

b. 2,100 gpm

10/9/2018 09:44:00 pm

c. if you are supplying a pump (much higher full than that and the pressure at the pump suction would drop below zero). Without a pump it would be a. or b. depending on the sprinkle systems required pressure. I used Hazen Williams and solved for the the three lowest flow rates individually. Is there a direct way to solve?

10/11/2018 09:13:04 am

Are these the same problems as in the Meyer PE Guide?

Joe Meyer

10/11/2018 09:58:08 am

Hi AJ,

No these daily problems are all different than the PE Prep Guide. Thanks!

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.