There is a confusing discrepancy between NFPA 13's ban on hanging 1.25" and greater pipe to bare metal deck versus the availability of UL listed anchors with a test load of 850 lb (that is the number for the 3/8" Sammy XP 20).
I don't understand how something that has passed such rigorous testing could be forbidden by the code. Does anybody have any background knowledge on this subject?
On top of this, I don't understand the configuration required for this application by NFPA 13. It says anchorage needs to be provided by "punching the vertical portion of the metal deck and using through bolts." (2016 Ed. 18.104.22.168.1) I don't know how to visualize this arrangement and there are no details or photos in the handbook.
Does anyone know what this is supposed to look like?
I've tried reaching out to NFPA's technical resources and have not gotten a response.
Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
Subscribe and learn something new each day:
Thank You to Our Top
October '20 Contributors!
Sprinkler Designer or Engineer?
Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:
Daily discussions are open-ended fire protection, fire alarm, and life safety questions submitted anonymously for the benefit of sharing expertise and learning from other perspectives. Anyone can submit a question here:
2020 PE Prep Guide
PE Prep Series
2020 PE Prep Series
(Click to enlarge)
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.