Welding, plasma cutting, oxy-acetylene, soldering, grinding — all hot work. The most common industrial fire trigger. NFPA 51B Standard for Fire Prevention During Welding, Cutting, and Other Hot Work requires a formal permit for every operation. This is how to set up a Hot Work Permit system.
Why a Formal Permit?
30% of industrial fires come from hot work (NFPA and FM Global data). Typical scenario: welder leaves the site, a spark smolders in an undetected composite area, flames appear 2-4 hours later. A permit system prevents this:
- Fire risk identified beforehand
- Written responsibilities
- Required fire watch duration
- Documented post-job inspection
Hot Work Permit Elements
- Work location: Specific address, room/area number
- Type of work: Welding / cutting / soldering / grinding
- Start and end time
- Spark prevention: Welding curtain, fire blanket, sprinkler bypass status
- Suppression equipment: 10 lb ABC extinguisher minimum, hose reel nearby
- Fire watch: Named, trained, radio-equipped
- Nearby combustible inventory: What is within 11 m radius?
- Signatures: Authorized person, operator, fire watch
Fire Watch Requirements
- Remain on site for the full work duration
- At least 30 minutes post-work observation
- 60 minutes in high-risk areas (archive, chemical plant)
- Certified on extinguisher use
- No additional duties (fire watch only)
- Responsible for smoke/heat detection alarms
Sprinkler Bypass Rules
Hot work may require covering or disabling sprinkler heads. NFPA 51B:
- Maximum 4 hours bypass; then system restored
- Written AHJ approval before bypass
- Extra fire watch and extinguishers during bypass
- Sprinkler restored immediately after work
- Log: date, time, personnel, cleared area
Turkey Practice
Turkish OHS regulation implies hot work permits without detail. In practice:
- Paper permits exist in large facilities (refineries, industrial parks)
- Absent at small sites — fires often start here
- Can be added to TSE EN ISO 3834 welding certification requirements
- Mobile permit apps (SafetyCulture, ProcoreSafety) gaining adoption
Facility risk assessment with SprinkCalc
Hot-work zone mapping, sprinkler bypass impact area, and risk calculation.
Learn MorePrimary reference: NFPA 51B - Hot Work. Official standard: NFPA 51B.