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When protecting underneath a continuous obstruction (example: a duct over 4-ft in width that extends through multiple different hazards), how do you space the sprinklers beneath the obstruction?
Industry standard, I would say, is to cover according to the hazard that each individual sprinkler is in. What code reference states this? What prevents you from spacing sprinklers underneath the duct at 15-ft throughout the length of the duct rather than switching between Light and Ordinary spacing? From what I read, NFPA 13 states how to install sprinklers under continuous obstructions but not necessarily what spacing is required in reference to hazard. Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments
Franck
9/13/2023 09:14:51 am
Same spacing as the minimum/maximum requirement for the corresponding occupancy.
Alex
9/13/2023 09:34:57 am
use the same coverage requirements for the ceiling protection. Remember, for OH, the maximum spacing is 130 SF with maximum between sprinklers at 15 feet. So if your ductwork is 4 feet, your spacing could be 15 feet on center and still meet the 130 SF.
Glenn Berger
9/13/2023 09:58:22 am
Spacing of sprinkler below obstructions follows the same rules as the spacing above the obstruction.
Casey Milhorn
9/13/2023 06:36:55 pm
I believe there's some more specific language proposed for the next NFPA 13 on this topic, including when you have to calc/prove these heads and when you don't. But basically, keep spacing and head type the same and use some commonsense on the pipe sizing feeding these heads in case you are made to prove it. Leave a Reply. |
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