Atmosphere-Supplying Respirators
Atmosphere-supplying respirators are used to provide breathing air from a source independent of the ambient atmosphere.
Atmosphere-Supplying Respirators
Respirators that supply breathing air are generally used in highly hazardous work environments. It is critical that such respirator systems provide breathing air of optimal quality and that the equipment operates reliably.
The two types of atmosphere-supplying respirators are:
- Supplied-air respirators (SARs) or Airline Respirators (AR) receive air from a connecting hose. The source of air is either a pressurized cylinder or an air compressor. Because the employee does not carry the air on his or her back when using a SAR, breathing air can be provided over a longer time period than that provided by a SCBA.
- Self-contained breathing apparatus (SCBA) units: Air is supplied from a tank (a cylinder of compressed air or oxygen). For this type of respirator, the source of the breathing air is designed to be transported by or with the equipment user.
Knowledge Check Choose the best answer for the question.
2-5. Which type of atmosphere-supplying respirator can provide air for a longer period of time?
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