After a thermal cutting or welding operation, how long must a fire watch remain?

After a thermal cutting or welding operation, how long must a fire watch remain?

• A. 15 Minutes
• B. 30 Minutes
• C. 45 Minutes
• D. 60 Minutes

Answer: (B)

After hot work like thermal cutting or welding, a fire watch must stay on scene for a 30-minute period. This time frame covers the window when embers and smoldering materials can continue to ignite nearby combustibles once the flame source is removed. During that watch, look for heat, smoke, or any signs of ignition, keep extinguishing equipment ready, and ensure all nearby flammable materials have been removed or adequately protected. In some higher-risk situations or according to different codes, longer watch times can be required, but the standard practice for this scenario is 30 minutes. A shorter period (such as 15 minutes) may not be enough to catch late ignitions, while longer periods (45 or 60 minutes) are generally reserved for more hazardous settings.

After hot work like thermal cutting or welding, a fire watch must stay on scene for a 30-minute period. This time frame covers the window when embers and smoldering materials can continue to ignite nearby combustibles once the flame source is removed. During that watch, look for heat, smoke, or any signs of ignition, keep extinguishing equipment ready, and ensure all nearby flammable materials have been removed or adequately protected. In some higher-risk situations or according to different codes, longer watch times can be required, but the standard practice for this scenario is 30 minutes. A shorter period (such as 15 minutes) may not be enough to catch late ignitions, while longer periods (45 or 60 minutes) are generally reserved for more hazardous settings.