30 C.F.R. §§ 75.1101-14–75.1101-22

Self-contained dry powder chemical systems shall be installed to protect each belt-drive, belt takeup, electrical-controls, gear reducing units and 50 feet of fire-resistant belt or 150 feet of non-fire-resistant belt adjacent to the belt drive.

The fire-control components of each dry powder chemical system shall be a type approved by the Underwriters' Laboratories, Inc., or Factory Mutual Engineering Corp.

The components of each dry powder chemical system shall be located so as to minimize the possibility of damage by roof fall or by the moving belt and its load.

Each self-contained dry powder system shall be equipped with hose or pipe lines which are no longer than necessary.

Metal piping and/or hose between control valves and nozzles shall have a minimum bursting pressure of 500 p.s.i.g.

Hose shall be protected by wire braid or its equivalent.

Nozzles and reservoirs shall be sufficient in number to provide maximum protection to each belt, belt takeup, electrical controls, and gear reducing unit.

Each belt shall be protected on the top surface of both the top and bottom belts and the bottom surface of the top belt.

Each self-contained dry powder chemical system shall be equipped with sensing devices which shall be designed to activate the fire-control system, sound an alarm and stop the conveyor drive motor in the event of a rise in temperature, and provision shall be made to minimize contamination of the lens of any optical sensing device installed in such system.

Where sensors are operated from the same power source as the belt drive, each sensor shall be equipped with a standby power source which shall be capable of remaining operative for at least 4 hours after a power cutoff.

Sensor systems shall include a warning indicator (or test circuit) which shows it is operative.

Each fire-suppression system shall be equipped with a manually operated control valve which shall be independent of the sensor.

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.

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.