Compressed air in SCBA cylinders shall meet the requirements of which specification?

Compressed air in SCBA cylinders shall meet the requirements of which specification?

• A. ISO 8573-1 clean air standard
• B. NFPA 1989
• C. OSHA breathing air standard
• D. ANSI/CGI G7.1 commodity specification for air

Answer: (D)

Breathing air inside SCBA cylinders must come from a source that is defined by a specific air-quality standard. The controlling specification for the compressed air itself is ANSI/CGI G7.1, the commodity specification for air. This standard sets the required limits for contaminants, moisture, oil aerosols, and undesirable gases, and it defines what grade of air (often Grade D) is acceptable for breathing equipment. By meeting this standard, the air is proven suitable for human respiration and compatible with SCBA systems. NFPA 1989 addresses breathing-air quality more broadly, including how air should be produced, tested, and managed for breathing apparatus, but the actual air in the cylinder is governed by the ANSI/CGI G7.1 specification. Other standards like ISO 8573-1 or OSHA breathing-air rules cover different scopes and do not specifically define the commodity breathing-air used in SCBA cylinders.

Breathing air inside SCBA cylinders must come from a source that is defined by a specific air-quality standard. The controlling specification for the compressed air itself is ANSI/CGI G7.1, the commodity specification for air. This standard sets the required limits for contaminants, moisture, oil aerosols, and undesirable gases, and it defines what grade of air (often Grade D) is acceptable for breathing equipment. By meeting this standard, the air is proven suitable for human respiration and compatible with SCBA systems.

NFPA 1989 addresses breathing-air quality more broadly, including how air should be produced, tested, and managed for breathing apparatus, but the actual air in the cylinder is governed by the ANSI/CGI G7.1 specification. Other standards like ISO 8573-1 or OSHA breathing-air rules cover different scopes and do not specifically define the commodity breathing-air used in SCBA cylinders.