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NFPA 13 Seismic Bracing Requirements: Cable Sway …
https://blog.qrfs.com/320-nfpa-13-seismic-bracing-requirements/
NFPA 13 Standard for the Installation of Sprinkler …
https://www.nfpa.org/assets/files/AboutTheCodes/13/TIA13-02-1.pdf
9.3.5.7 Where the horizontal seismic loads used exceed 0.5 Wp and the brace angle is less than 45 degrees from vertical or where the horizontal seismic load exceeds 1.0 Wp and the brace angle is less than 60 degrees from vertical, the braces shall be arranged to resist the net vertical reaction produced by the horizontal load.
Introduction to Seismic Protection for Sprinkler Systems
https://www.nfpa.org/News-and-Research/Publications-and-media/Blogs-Landing-Page/NFPA-Today/Blog-Posts/2021/03/19/Introduction-to-Seismic-Protection-for-Sprinkler-Systems
NFPA 13 contains requirements for both lateral (perpendicular to the piping) and longitudinal (parallel to the piping) horizontal braces (shown below). The maximum spacing of lateral braces of 40 ft (12 m) is based on the strength of the piping as a beam under the uniform load of its expected horizontal “weight.”
Seismic Restraint of Sprinkler Systems – NFPA-13 versus …
https://risklogic.com/seismic-restraint-of-sprinkler-systems-nfpa-13-versus-fm-global-standards/
FM Global specifies seismic bracing be provided when located in 50-year through 500-year earthquake zones, as shown on the maps in FM Global Data Sheet 1-2, Earthquakes. NFPA-13 allows the use of tension-only (i.e. – wire/cable type) braces, where FM only allows the use of tension-only bracing for end of branch line restraint.
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