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Standards For Grade D Breathing Air Quality

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Grade D Breathing Air Quality

The quality of breathing air follows standards which have been developed by the ANSI / Compressed Gas Association (CGA) G-7.1 – 1989 & adopted by OSHA to the respiratory standard 29 CFR, 1910.134.

Air Quality for Grade D Breathing Must Meet and/or Exceed These Requirements -

  • Oxygen 19.5 - 23.5% (20 - 22% for Canada)
  • Hydrocarbon - condensed oil - 5 mg per m3 maxi (< 1Mg per m3 for Canada)
  • (CO) Carbon Monoxide - 10ppm max (5 ppm for Canada)
  • (CO2) Carbon Dioxide - 1000ppm max (500 ppm for Canada)
  • Odor - No noticeable smells or tastes
  • Water Content
    • High pressure cylinder air needs to have a minimum dew point of -50 deg F (-45.6 degrees C) @ 1 atmosphere, or 14.7 psi.
    • Low pressure breathing air needs to have a minimum dew point of 10 degrees F (5.56 degrees C) below the ambient temp. @ 1 atmosphere, or 14.7 psi. Canada – 5 degrees C below lowest temp., 27 ppm max. water vapor
    • (Canada) Total Volatile Hydrocarbons - 5 ppm max.

Grade E Air Quality Standards

Grade E breathing air quality has been specified by the ANSI / Compressed Gas Association or CGA G-7.1 1997 for compressed air being stored in air cylinders, such as SCBA tanks or in large breathing air cylinders.

Grade E breathing air quality is congruent with Grade-D standards with a few differences

  • Oxygen content must be between 20 – 22 percent
  • Total Volatile Hydrocarbons 25 ppm max.
  • Water Content for High pressure cylinder air must has a minimum dew point of -50 degrees F (-45.6 degrees C) and water vapor content 67 ppm max.
    • NFPA 1500 regulations concerning Fire Department usage may be different from some OSHA requirements
  • The Canadian standard for cylinder air might vary. Contact the CSA for more details

Air Systems Specifications For Grade D Filtration

First Stage Filter : Indicator for Filter Change, Removes Liquids & Particulates to 5.0 microns, Automatic Drain

Second Stage Filter : Indicator for Filter Change, Automatic Drain, Oil Coalescing & Filtration for Ultra fine Particulate to .01 microns

Third Stage Filter : Indicator for Filter Change, Charcoal for Removal of Organic Vapors & Objectionable Odors, Manual Drain

  • Inline (CO )Carbon Monoxide Monitor. Optional C0 / 02 Monitor
  • All portable & fixed units available with a CSA approved, intrinsically safe monitor to accommodate hazardous location work
  • 2 yr. warranty for Sensor & CO Monitor
  • A Filter Change Indicator is provided for all three filters (the BB15-CO series features an indicator for the 2nd stage only)
  • 3 Standard Power Options - Dual 9V Battery, 8 - 16VDC and / or 115V AC, 60 Hertz (50 Hertz Optional)
  • A Safety Relief Valve which is set at 125psi for outlet pressure
  • Aluminum Block Solid Manifold with a manual drain
  • Pressure Gauge 0 - 160psi
  • Visual Flow meter Verifies Airflow to the Monitor, flow rate adjustable 50 -100 cc
  • Externally Mounted Carbon Monoxide (CO) LED Warning Lights & Audible Alarm
  • Remote DC Alarm Jack w/ Cover Cap come standard on the portable units - Optional on the BB15-CO Series. An AC output is supplied on panel mount models
  • Max Inlet Pressure of 150psi
  • Respirator couplings are provided with a safety lock
  • Portable Air Systems Breather Box units have been designed for use in closed position which prevents internal contamination.

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