Does anyone know if NFPA 13 has verbiage concerning a clearance of a movable obstruction (jib hoist) located under a sprinkler system head?
Treat it as standard obstruction to sprinkler discharge. Chapters 10, 11 in NFPA13:2019
The only standard in NFPA 13 for movable obstructions that I am aware of is overhead doors in accordance with Section 10.3.2 (3). The NFPA 13 standards mainly refer to obstructions fixed to the structure. If this room has only one sprinkler head, this may be a problem in the location of that sprinkler head. To me if there are more than one sprinkler head in the room, it may not be an obstruction as define in the standard.
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