 Following process industry disasters such as the 1984 Bhopal disaster and 1988 Piper Alpha explosion, in 1992 the United States Department of Labor Occupational Safety and Health Administration (OSHA) published in the Federal Register at 57 FR 6356 (1992-02-24) its Process Safety Management (PSM) standard in 19 CFR 1910.119.OSHA PSM recognizes FTA as an acceptable method for process hazard analysis (PHA).Today FTA is widely used in system safety and reliability engineering, and in all major fields of engineering.