30 CFR § 75.1101-22 Inspection of dry powder chemical systems.
(a) Each dry powder chemical system shall be examined weekly and a
functional test of the complete system shall be conducted at least once each
year.
(b) Where the dry powder chemical system has been actuated, all
components of the system shall be cleaned immediately by flushing all powder
from pipes and hoses and all hose damaged by fire shall be replaced.
