One of the more common issues we come across in regards to Hot Work is the encroachment of combustible/flammable hazards within the REQUIRED 35′ Fire Safety Zone.
1910.252(a)(2)(vii) Relocation of combustibles. Where practicable, all combustibles shall be relocated at least 35 feet (10.7 m) from the work site. Where relocation is impracticable, combustibles shall be protected with flameproofed covers or otherwise shielded with metal or asbestos guards or curtains.
But this requirement has more meaning than just ordinary combustibles. In areas where we have contained flammables, we need to monitor the area for these flammable gases and/or vapors.
1910.252(a)(2)(vi) Prohibited areas. Cutting or welding shall not be permitted in the following situations:
1910.252(a)(2)(vi)(A) In areas not authorized by management.
1910.252(a)(2)(vi)(B) In sprinklered buildings while such protection is impaired.
1910.252(a)(2)(vi)(C) In the presence of explosive atmospheres (mixtures of flammable gases, vapors, liquids, or dusts with air), or explosive atmospheres that may develop inside uncleaned or improperly prepared tanks or equipment which have previously contained such materials, or that may develop in areas with an accumulation of combustible dusts.
1910.252(a)(2)(vi)(D) In areas near the storage of large quantities of exposed, readily ignitible materials such as bulk sulfur, baled paper, or cotton.