The NFPA 13 sections on cloud ceilings continue concentrate on sprinklers above the cloud ceilings, not the sprinklers in the clouds themselves.
If the area above the cloud is sprinklered throughout, yet there are multiple clouds greater than 4-ft wide in the shortest direction (all at the same elevation plane), creating obstructions to the sprinklers above, does each cloud obstruction need to be treated independently for sprinkler coverage beneath, or can the designer “skip” clouds or portions of the clouds and gaps, as long as the overall pendent sprinkler spacing does not exceed the maximum spacing for the hazard?
I would think the opening width between the clouds would play a role in this as well, the heat's ability to skip the gap. And whether or not the sprinklers above are able to develop their spray pattern.
I often see designs with sprinklers in clouds spaced out 15' x 15' leaving some clouds without sprinklers. As far as I can tell, even the 2022 edition and handbooks are silent on this.
Thanks in advance.
Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
Subscribe and learn something new each day:
Top October '23 Contributors
Get 100 Days of Free Sample Questions right to you!
PE PREP SERIES