How should fire hazards be controlled when welding near flammable liquids?

• A. Weld over the liquids to vaporize them.
• B. Remove liquids, cover with fire blankets, have a fire extinguisher and fire watch.
• C. Pour water on the liquids before welding.
• D. Weld as fast as possible to minimize exposure.

Answer: (B)

When welding near flammable liquids, the priority is to remove the fuel source and have active protection in place. Take liquids away from the work area to prevent vapors from forming and reaching ignition sources. If any liquids cannot be moved, cover the area with fire blankets to confine vapors and prevent sparks or heat from igniting them. Have a fire extinguisher readily available and assign a fire watch to monitor for signs of ignition during and after welding, since embers and heat can start fires even after the weld is done.

Welding over liquids to vaporize them is dangerous because it creates flammable vapors that can be ignited by sparks or hot metal. Pouring water on the liquids before welding is unsafe for many liquids, as it can spread spills, cause steam burns, or react unpredictably. Welding as fast as possible does not address the hazard and may still allow vapors or embers to ignite.