osha 1910.159

this letter constitutes osha’s interpretation of the requirements discussed. this letter constitutes osha’s interpretation only of the requirements discussed and may not be applicable to any questions not delineated within your original correspondence. de minimis violations of standards are violations of existing osha standards that have no direct or immediate impact on the safety and health of workers. does this apply only to materials placed directly below the sprinkler heads? however, materials stored on shelves against a wall are not subject to this requirement because they do not impede the overlap of spray from multiple sprinkler heads.

response 3: since your letter does not contain adequate information on the types of sprinklers and obstructions in question, our response is based on the limited information provided. in addition to the specific circumstances referenced in our response to question 2, the 18-inch clearance does not apply to vehicles in parking garages. additionally, please note that the answers given apply to clearance from stored materials only. furthermore, the rules differ for sprinkler types other than standard pendant and upright models. this letter constitutes osha’s interpretation of the requirements discussed. to keep apprised of such developments, you can consult osha’s website at .

this web site is designed for the current versions of microsoft edge, google chrome, mozilla firefox, or safari. sections 1910.6, 1910.7, 1910.8 and 1910.9 also issued under 29 cfr 1911. section 1910.7(f) also issued under 31 u.s.c. the ecfr is displayed with paragraphs split and indented to follow the hierarchy of the document. this is an automated process for user convenience only and is not intended to alter agency intent or existing codification. (1) the requirements of this section apply to all automatic sprinkler systems installed to meet a particular osha standard.

(ii) the employer shall assure that only approved equipment and devices are used in the design and installation of automatic sprinkler systems used to comply with this standard. the employer shall assure that every automatic sprinkler system is provided with at least one automatic water supply capable of providing design water flow for at least 30 minutes. the employer shall assure that automatic sprinkler system piping is protected against freezing and exterior surface corrosion. the employer shall assure that sprinklers are spaced to provide a maximum protection area per sprinkler, a minimum of interference to the discharge pattern by building or structural members or building contents and suitable sensitivity to possible fire hazards. the employer shall assure that hydraulically designed automatic sprinkler systems or portions thereof are identified and that the location, number of sprinklers in the hydraulically designed section, and the basis of the design is indicated.

the employer shall properly maintain an automatic sprinkler system installed to comply with this section. the employer shall assure that a main drain flow test osha does not impose penalties or require abatement of de minimis violations. question 1: .159(c)(10) in part states, “the minimum vertical clearance these letters provide guidance to clarify the application of an established osha standard, policy, or procedure, but they may not, in themselves, establish or, .

(a) scope and application. (1) the requirements of this section apply to all automatic sprinkler systems installed to meet a particular osha standard. automatic sprinkler systems — osha standard 1910.159 1910.159 of the occupational safety and health act refer to the osha web site given above. (a) scope and application. (1) the re- quirements of this section apply to all automatic sprinkler systems installed to meet a particular osha standard., .

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