![]() ![]() ![]() Typical open-circuit systems have two regulators a first stage to reduce the pressure of air to allow it to be carried to the mask, and a second stage regulator to reduce it even further to a level just above standard atmospheric pressure. Open-circuit industrial breathing sets are filled with filtered, compressed air, rather than pure oxygen. It is used when a longer-duration supply of breathing gas is needed, such as in mine rescue and in long tunnels, and going through passages too narrow for a big open-circuit air cylinder. ![]() The closed-circuit type, also known as a rebreather, operates by filtering, supplementing, and recirculating exhaled gas. The term self-contained means that the SCBA is not dependent on a remote supply of breathing gas (e.g., through a long hose). Unofficial names include air pack, air tank or simply pack.Īn SCBA typically has three main components: a high-pressure tank, a pressure regulator, and an inhalation connection (mouthpiece, mouth mask or face mask), connected together and mounted to a carrying frame.Ī self-contained breathing apparatus may fall into one of two categories: open-circuit or closed-circuit. They are typically used in firefighting and industry. A self-contained breathing apparatus ( SCBA) is a device worn to provide breathable air in an atmosphere that is immediately dangerous to life or health. ![]()
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