Before any welding is conducted outside of a designated welding area, a responsible individual must inspect the area and identify precautions to be taken preferably on a written hot works permit. Fire extinguishers must be ready for immediate use. A fire watch lasting at least 30 minutes after the welding or cutting operations is required if more than a minor fire might develop. All combustibles must be moved 35 feet away or properly protected or shielded.
FM Directive 788 - Cutting, Welding Grinding and Brazing Hot Work Permits (pdf)