Self-contained breathing apparatus
A self-contained breathing apparatus, or SCBA, is a respirator that does not clean the air. In place of cleaning the air, this respirator holds breathable air in a gas cylinder.[1] It is often used by firefighters and workers doing a job in a confined space. In these places, cleaning the air can not be done, as people would die. SCBAs in the United States are checked by NIOSH and the National Fire Protection Association.[2]
A person using a gas cylinder under water is using a SCUBA set. This is not an SCBA, which is used out of water.
Types of SCBA
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NIOSH says there are three types of SCBA: closed-circuit, open-circuit, and continuous-flow.
Closed-circuit type
[change | change source]There are many names for the closed-circuit SCBA system. Some call it a rebreather, as no air leaves the SCBA system. There are two types of closed-circuit SCBA:[3]
- Uses Compressed oxygen.
- Uses an oxygen-generating solid. This type of closed-circuit SCBA uses a chemical reaction. A chlorate candle has to be hit to start this type of closed-circuit SCBA.[3]
Closed-circuit SCBAs work in the 1 hour range.[3]
Open-circuit type
[change | change source]In the open-circuit SCBA system, air leaves the SCBA system. Compressed oxygen is not to be used. There are two types of open-circuit SCBA:[4]
- Demand
- Pressure-demand
If the part that goes on the face was made for "demand," it cannot be used with a "pressure-demand" SCBA. And a part made for "pressure-demand" cannot be used with a "demand" SCBA. Both types of open-circuit SCBA work from 30 to 60 minutes.[4]
Continuous flow
[change | change source]Escape SCBAs are a type of continuous flow SCBA. Escape SCBAs come with hoods. Hoods are transparent plastic put on the head. Escape SCBAs are only used for getting out of a deadly place.[5][6][7]
Escape SCBAs work from 3 to 10 minutes.[4]
Related Pages
[change | change source]Notes
[change | change source]- ↑ Bollinger 1987, p. 184
- ↑ "NFPA". NFPA. Archived from the original on 6 April 2018. Retrieved 5 May 2018.
- ↑ 3.0 3.1 3.2 Bollinger 1987, pp. 55–56
- ↑ 4.0 4.1 4.2 Bollinger 1987, pp. 59–64
- ↑ Bollinger 1987, p. 207
- ↑ Bollinger 1987, pp. 7–8
- ↑ Bollinger 1987, p. 65
References
[change | change source]- Bollinger, Nancy J. (1987). NIOSH Guide to Industrial Respiratory Protection.