Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Flexible sprinkler drop

Flexible sprinkler drop

Flexible sprinkler drop

Does anyone know of any clarification of NFPA 13 2019 edition

"* Where flexible sprinkler hose fittings exceed 6 ft(1.8 m) in length and are supported by a suspended ceiling in
accordance with, a hanger(s) attached to the structure shall be required to ensure that the maximum unsupported length does not exceed 6 ft (1.8 m)."

Is this referring to only the flexible hose itself or would the armover be added. For example, a 6' flexible drop is connected to a 10" armover. Would the 10" armover need to be hung due to the assembly being longer than 6'?

RE: Flexible sprinkler drop

Common sense should prevail. Flexible hose and rigid pipe have different properties and behave differently. Each one has its own limitation for unsupported free length. In your example you present the two within the limits to be unsupported but personally I wouldn't let it like that. The limitation of 6 ft/1.8 m of NFPA 13 is meant mainly for a hose that is directly tied to the branch line. For your example, I would include a support. This support however can potentially be right at the end of the rigid pipe, satisfying practically the 6 ft/1.8 m limit for the hose.

RE: Flexible sprinkler drop

I agree with UFT12.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close