Hot Work and Fire Watch: How Vision AI Can Support Worksite Fire Prevention

By the Sentrick Industrial team · Published October 18, 2026

Routine work with a serious downside

Welding, cutting, grinding and brazing throw sparks, slag and heat, and they do it every day on construction sites, in plants and in maintenance shops. Because the work is so routine, the controls around it can slip: a permit that was never closed out, a fire watch who left early, combustible material left a few feet from the work. Fire prevention in these settings depends on people following simple steps consistently. That is exactly where extra visibility can help.

How hot work controls usually work

• Permit. A written authorization that names the location, the work and the time window, and confirms that precautions are in place.
• Area preparation. Combustibles removed or protected, floor openings covered, extinguishers within reach.
• Fire watch. A trained person assigned to watch for sparks and small fires during the work and for a period afterward.
• Close-out. A final check that the area is safe before the permit is signed off.

Requirements differ by jurisdiction, insurer and site policy, so treat this as an outline and follow the rules that apply to you.

Where these controls tend to break down

• Hot work without a permit. A quick job done where no permit exists, often because it seemed too small to bother with.
• Permit and reality drifting apart. The permit says one area; the work moves to another.
• Fire watch gaps. The watch is distracted, pulled onto other tasks, or leaves before the after-work period ends.
• Combustibles nearby. Pallets, packaging, fuel containers or insulation left within reach of sparks.
• Blocked egress. Equipment or material in walkways and exits, which turns a small fire into a bigger problem. See our piece on blocked exit and walkway detection.

Where vision AI can help

Vision AI will not replace a trained fire watch, a permit process or fire detection equipment. What it can do is add an extra set of eyes on conditions that are easy to miss. Depending on camera views and configuration, a site might use it to:

• Flag sparks, arc flash or active hot work in an area where no permit is recorded as active.
• Notice when a designated fire-watch position is unattended while hot work is going on.
• Highlight stacked combustible material inside a defined radius around a work zone, as a prompt for a person to check.
• Support early notice of visible smoke or flame, as a complement to certified detectors.
• Spot blocked exits and walkways near the work area.

Each of these should be treated as a prompt for a person to look, not as a verdict. Welding light, steam, dust and reflections can confuse any camera system, so expect tuning and some false alerts, as covered in our guide to tuning vision AI false positives.

Combining AI with permit data

The most useful setups link what the camera sees with what the paperwork says. A zone marked as hot work permitted can expect sparks; the same activity in an unpermitted zone is worth an immediate call. Even a simple schedule, where active permits are mapped to defined areas and time windows, gives alerts meaning. This is a form of hazard zone detection with the zone's status coming from the permit system.

Practical steps to start

1. List the areas where hot work happens most often, such as maintenance bays, fabrication areas and active construction levels.
2. Check camera views of those areas in real working conditions, including glare from welding.
3. Define two or three conditions to monitor, such as hot work with no active permit or an unattended fire-watch post.
4. Decide who receives alerts and what they do, for example a supervisor walking to the area.
5. Pilot in one area, review every alert, and adjust before expanding. Our pilot plan outlines a structure.

Keep workers in the loop

Be clear with crews about what is being monitored and why. The aim is to catch conditions, such as a missing permit or an unattended watch post, and to support the people doing the work, not to single out individuals. Our guide to data retention and worker privacy covers policy points to settle first.

Where Sentrick Industrial fits

Sentrick Industrial applies behavioral and vision AI to worksite video to help surface hazard-zone activity, blocked exits and unsafe conditions for supervisors to review. It is designed to support, not replace, hot work permits, trained fire watches and certified detection equipment. A pilot on your own footage is the best way to judge fit.

The takeaway

Fires from hot work usually start with a small lapse in a routine process. Strong permits and a dedicated fire watch remain the foundation. Vision AI can add a layer of attention by flagging unpermitted work, unattended watch posts, nearby combustibles and blocked exits, so a person can step in while the problem is still small.