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California’s Process Safety Management of Acutely Hazardous Materials (PSM) regulations list the requirements for preventing or minimizing the consequences of catastrophic releases of toxic, reactive, flammable, or explosive chemicals. They are intended to eliminate, to a substantial degree, the risks to which employees are exposed in petroleum refineries, chemical plants, and other facilities.
The regulation applies to any process that involves a chemical at or above specified threshold quantities, or any process that involves a Category 1 flammable gas as defined by Title 8 CCR 5194, or a flammable liquid with a flashpoint below 100° F on site in one location in a quantity of 10,000 pounds or more.