POCA, W.Va. (AP) - Two workers were injured Monday when highly flammable gas used in welding exploded at a West Virginia industrial site, officials say.
Fire crews were sent at about 3:20 p.m. to Airgas, a distributor of specialty gases in Poca, outside of Charleston. Putnam County emergency management director Frank Chapman said the explosion involved about 50 tanks of acetylene that were at Airgas waiting to be refilled. What caused the tanks to explode wasn't known.
Chad Jones, a firefighter with the Bancroft Volunteer Fire Department, said four cylinders continued to burn Monday evening and that crews were letting them "burn out." They were dousing other tanks with water to keep them from exploding, said Jones, whose station was one of several to respond to the scene.
The tanks were being stored in a bay behind the facility. Jones said after the first tank exploded, "it was like a chain reaction," with fireballs shooting 100 to 150 feet in the air. A nearby business evacuated, and windows were shattered in the back of the Airgas plant, Jones said.
Acetylene is used in welding canisters. Airgas, which calls itself the largest U.S. supplier of industrial, medical and special gases, also lists on its website propane, often used in backyard grills; hydrogen, helium; and nitrous oxide, or the "laughing gas" used during certain dental procedures.
Chapman said the explosion involved residue of the gas left in the tanks. He said the blast would have been much worse if the tanks were filled. He said both workers suffered second and third-degree burns.