What fire prevention and protection precautions does 29 CFR 1910.252 require before welding, cutting, or brazing operations begin? Answer in under 100 words. Cite only eCFR (www.ecfr.gov) sources.

Details / How it works

Basic precautions: If the object can be moved, it should be welded or cut in a safe location; otherwise, movable fire hazards are taken to a safe place, and remaining hazards are shielded with guards. Authorization: Before any cutting or welding begins, the designated authorizing individual inspects the area and issues precautions, preferably as a written permit. Fire watch duties: Watchers carry ready extinguishing equipment, know how to sound alarms, monitor all exposed areas, and stay on duty for at least a half hour after operations conclude. Management, supervisors, and welders/cutters each carry defined responsibilities, and contractors must be advised of flammable materials or hazardous conditions.

Numbers & thresholds

Exceptions & edge cases

• Welding/cutting is prohibited in unauthorized areas, in sprinklered buildings while protection is impaired, where explosive atmospheres exist or may develop, and near large quantities of exposed, readily ignitible materials (e.g., bulk sulfur, baled paper, cotton).
• Combustible floors may be kept wet or covered with damp sand/fire-resistant shields—but arc welding personnel must then be protected from possible shock.
• Ducts and conveyor systems that might carry sparks to distant combustibles must be suitably protected or shut down.
• Metal partitions, walls, ceilings, or roofs with combustibles on the far side require precautions against ignition by conduction or radiation, including a fire watch on the opposite side.
• Hot work is never permitted on used drums, barrels, tanks, or containers until thoroughly cleaned of flammable substances; hollow spaces must be vented (and purging with inert gas is recommended).