Pennsylvania Statutes Title 52 P.S. Mines and Mining § 70-278. Acetylene burners or blow torches

Welding, cutting or soldering with arc or flame, use of blow torch in underground face regions shall be done under the direct supervision of the mine foreman or assistant mine foreman who shall test for methane before and during such operations in gassy mines and shall make a diligent search for fire after such operations in all mines. Suitable fire extinguishers shall be immediately available during such welding, cutting, soldering or use of blow torch.