Gas Valve Failure During Routine Maintenance Work May Have Led to Fatal Explosion, US Steel Says HARRISBURG, Pa. (AP) — Preparations for a routine maintenance task may have led to an explosion at a ...

U.S. Steel on Friday pinned blame for the deadly explosion Monday at the Clairton Coke Works on a valve failure that led to coke oven gas igniting, according to the company’s preliminary findings.

INVESTIGATION RESULTS. THE CHEMICAL SAFETY BOARD’S FINDINGS THUS FAR DETAILS WORK THAT WAS BEING DONE ON THE GAS ISOLATION VALVE IN THE BASEMENT OF THE 1314 BATTERY TRANSFER AREA. THE REPORT EXPLAINS ...