Hot Work Permits
All welding, cutting, brazing, soldering, and grinding that produces sparks must have a Hot Work Permit in non-designated areas. The permit specifies: location, duration, hazards present, fire watch requirements, and fire extinguisher placement. The superintendent signs off. Never weld without a current, valid permit.
Fume Hazards
Welding fumes contain metal oxides that can cause lung disease, neurological damage (manganism from manganese), and metal fume fever. Chrome-6 from stainless steel welding is a known carcinogen. Ventilation is mandatory. Use mechanical exhaust ventilation when in confined or low-air-movement areas.
Respiratory Protection
For mild steel welding with adequate ventilation: P100 or N95 may suffice. For stainless, coated metals, or confined spaces: air-purifying respirator with OV/P100 cartridges or supplied air is required. Know what base metal you are welding — coatings (paint, galvanizing) dramatically change the hazard profile.
Fire Watch
Post a fire watch during all hot work and for 30 minutes AFTER completion. The fire watch must: have a fully charged extinguisher, monitor for smoldering materials, not leave the area, and be trained in fire extinguisher use. Hot work within 35 feet of flammables requires additional precautions or relocation of materials.
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