OSHA General Industry Standards (29 CFR Part 1910)
Fire Protection (Subpart L)

OSHA General Industry Standards (29 CFR Part 1910) 1910.159: Automatic sprinkler system inspection and maintenance

Automatic sprinkler systems must maintain 18-inch minimum clearance between sprinkler deflectors and stored materials, have water supply capable of design flow for 30+ minutes, conduct annual main drain flow tests and inspector's test valve operation every 2 years, and provide equivalent protection during any period the system is out of service.

Other controls in Fire Protection (Subpart L)

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