Scope and application.
The requirements of this section apply to all automatic sprinkler systems installed to meet a
particular OSHA standard.
For automatic sprinkler systems used to meet OSHA requirements and installed prior to the effective
date of this standard, compliance with the National Fire Protection Association (NFPA) or the National Board of Fire Underwriters (NBFU) standard in
effect at the time of the system's installation will be acceptable as compliance with this section.
Exemptions. Automatic sprinkler systems installed in workplaces, but not required by OSHA, are exempt
from the requirements of this section.
General requirements -
All automatic sprinkler designs used to comply with this standard shall provide the necessary
discharge patterns, densities, and water flow characteristics for complete coverage in a particular workplace or zoned subdivision of the
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.
Maintenance. 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 is performed on each system annually. The inspector's test valve shall be
opened at least every two years to assure that the sprinkler system operates properly.
Acceptance tests. The employer shall conduct proper acceptance tests on sprinkler systems installed
for employee protection after January 1, 1981, and record the dates of such tests. Proper acceptance tests include the following:
Flushing of underground connections;
Hydrostatic tests of piping in system;
Air tests in dry-pipe systems;
Dry-pipe valve operation; and
Test of drainage facilities.
Water supplies. 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. An auxiliary water supply or equivalent protection
shall be provided when the automatic water supply is out of service, except for systems of 20 or fewer sprinklers.
Hose connections for fire fighting use. The employer may attach hose connections for fire fighting
use to wet pipe sprinkler systems provided that the water supply satisfies the combined design demand for sprinklers and standpipes.
Protection of piping. The employer shall assure that automatic sprinkler system piping is protected
against freezing and exterior surface corrosion.
Drainage. The employer shall assure that all dry sprinkler pipes and fittings are installed so that
the system may be totally drained.
The employer shall assure that only approved sprinklers are used on systems.
The employer may not use older style sprinklers to replace standard sprinklers without a
complete engineering review of the altered part of the system.
The employer shall assure that sprinklers are protected from mechanical damage.
Sprinkler alarms. On all sprinkler systems having more than twenty (20) sprinklers, the employer
shall assure that a local waterflow alarm is provided which sounds an audible signal on the premises upon water flow through the system equal to the
flow from a single sprinkler.
Sprinkler spacing. 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 minimum vertical clearance between sprinklers and material below shall be 18 inches (45.7 cm).
Hydraulically designed systems. 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. Central records may be used in lieu of signs at sprinkler valves provided the records are available for inspection and
copying by the Assistant Secretary.
[45 FR 60710, Sept. 12, 1980; 46 FR 24557, May 1, 1981]