Self-Contained Breathing Apparatus (SCBA)
Definition - What does Self-Contained Breathing Apparatus (SCBA) mean?
A self-contained breathing apparatus may also be called a compressed air breathing apparatus (CABA).
Safeopedia explains Self-Contained Breathing Apparatus (SCBA)
- A single or a pair of high-pressure tanks made of steel, aluminium or carbon-fiber composite (2,216 to 4,500 psi or 150-310 bars)
- One pressure regulator
- A face-seal mask or facepiece, mouthpiece and connecting supply pipes
- A carrying frame or pack
- The closed-circuit type filters, supplements and recirculates exhaled gas. Where a longer-duration supply of breathing gas is needed, such as in a mine, closed-dcircuit SCBA sets are used.
- Open-circuit sets are filled with breathable compressed air that lasts for 30-60 minutes. The air is stored in the tanks and the pressure is regulated to the same level of the breathable atmosphere by a regulator. Newly invented carbon fiber composite cylinders provide breathable air for about 90 minutes in a single fill. These cylinders weigh about 15 - 18 kg. The user uses a face-sealed mask where a positive pressure is maintained to ensure that no outside air can come into the breathing system