A flame arrestor is a safety device designed to prevent the propagation of flames in industrial settings. It works by allowing gases to pass through while cooling and extinguishing any flames that may attempt to travel back through the system. This is crucial in environments where flammable gases, such as natural gas or hydrogen, are present. Flame arrestors are commonly used in various applications, including chemical plants, refineries, and storage tanks. They are essential for protecting equipment and personnel from potential explosions or fires, ensuring safer operations in facilities that handle volatile substances.