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An open circuit SCBA typically has three main components: a high-pressure gas storage cylinder, (e.g., 2,216 to 5,500 psi (15,280 to 37,920 kPa), about 150 to 374 atmospheres), a pressure regulator, and a respiratory interface, which may be a mouthpiece, half mask or full-face mask, assembled and mounted on a framed carrying harness.
The Scott Air-Pak SCBA is an open-circuit, self-contained breathing apparatus designed to meet the National Fire Protection Association (NFPA) Standard 1981. All components, excluding the air cylinder, were designed and manufactured by Scott Safety .
The company still produces its flagship product, the Scott Air-Pak SCBA. [11] [12] Scott Safety creates several kinds of compressor systems including the HushAir 7500 Connect which includes the HushAir Connect RevolveAir Connect for filling SCBA cylinders, and SmartTouch Controller, which integrates the breathing air compressor, storage bottles, and a charge station.
Often incorrectly called "oxygen mask" by laypersons. These are typically open circuit style, with a supply of compressed air, where expired air is exhausted, rather than closed circuit where it is filtered, re oxygenated from compressed oxygen, and inhaled again—which is used where an air supply is needed for an extended period (up to four ...
EN 402:2003 — Respiratory protective devices - Lung governed demand Self-contained open-circuit compressed air breathing apparatus with full face mask or mouthpiece assembly for escape. [ 10 ] ISO 23269-1:2008 — Ships and marine technology — Breathing apparatus for ships — Part 1: Emergency escape breathing devices (EEBD) for shipboard use.
The need to ditch the set quickly may not arise, and harness straps may not need a quick-release. Buoyancy is not a consideration, but weight may be critical. Good ergonomic design for ease of carrying, comfort, and balance are important where the unit may be worn in confined spaces, while climbing and crawling through small gaps. [24]
The SCBA gave 90 minutes dive duration with no reserve. In mixture ( nitrox or heliox ) mode it was called SCMBA . An old photograph seems to show the cylinders (and perhaps also the weights) in a tied or laced canvas casing rather than held on with metal clamps, and a rectangular fullface mask as with the CDBA.
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