Routing Mains Underneath vs. In-Between Joists

8/30/2017

When can a fire sprinkler main simply run parallel to and directly underneath structure (such as an open-web joist), and when must is be located in-between joists and hung with trapeze hangers?

Note: This is a Daily Discussion question submitted anonymously to us. Submit a Question or Discuss This Here.

3 Comments

David

8/30/2017 09:54:48 am

The simple answer is you can hang to the side any time.

However it is important to note that you should consult the structural engineer on the specific site/job to make sure that truss can handle the load of your main. generally the smaller mains 4" and below would not have an issue, but they can based on the designed load factors.

David

8/30/2017 09:56:52 am

I forgot to add that based on the structural engineer's design you may or may not need to trapeze that main, or reduce your hanger spacing.

Bill Dust

8/31/2017 08:10:36 am

I 100% agree with David's comments, and this is how we approach it at our office.

Free Signup

Subscribe and learn something new each day:

Community

Thank You to Our Top July 2019 Contributors!

1. Amr
2. Wayne A.
2. Mike
4. SR
5. Ben O.

6. Pari
7. Rusty S.
8. MDS
9. DM
10. PJD

Your Post

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 © 2019 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.