Scope and application. This section applies to all fixed extinguishing systems, using dry chemical as
the extinguishing agent, installed to meet a particular OSHA standard. These systems shall also comply with 1910.160.
The employer shall assure that dry chemical agents are compatible with any foams or wetting agents
with which they are used.
The employer may not mix together dry chemical extinguishing agents of different compositions. The
employer shall assure that dry chemical systems are refilled with the chemical stated on the approval nameplate or an equivalent compatible
When dry chemical discharge may obscure vision, the employer shall provide a pre-discharge employee
alarm which complies with 1910.165 and which will give employees time to safely exit from the discharge area prior to system discharge.
The employer shall sample the dry chemical supply of all but stored pressure systems at least
annually to assure that the dry chemical supply is free of moisture which may cause the supply to cake or form lumps.
The employer shall assure that the rate of application of dry chemicals is such that the designed
concentration of the system will be reached within 30 seconds of initial discharge.
[45 FR 60712, Sept. 12, 1980]