Module 7 - IAFF

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IAFF Training for Hazardous Materials: Technician© Student Text Advantages of Closed Circuit SCBA • Increased work duration Limitations of Closed Circuit SCBA • New technology to the fire service • Different, if not more difficult, to maintain • Unknown factors in use with CPC Positive Pressure Supplied Air Respirator (PP SAR) Activity Supplied air respirators combine the full facepiece style of regular SCBA but without the constraints of a backplate, harness and cylinder. A hoseline delivers an air supply to the user’s facepiece and maintains it at a positive pressure. The user receives the benefits of a full facepiece PP SCBA without having to carry the air supply. It also can provide an almost limitless supply of air. Air line systems can be connected to large cylinders or cylinder switching systems, where the supply can be switched from one cylinder to another when the first cylinder becomes low. Supplied Air Respirator System 7-16 Module 7: Personal Protective Equipment
Student Text IAFF Training for Hazardous Materials: Technician© Advantages of Positive Pressure SAR • Longer work periods than SCBA • Less bulky and less heavy than SCBA • Protects against airborne contaminants to the same level as positive pressure SCBA Limitations of Positive Pressure SAR • Hoseline impairs mobility • OSHA / NIOSH limits hose to 300 feet from the point of air supply • Check local, state, and manufacturer’s recommendations • As length of hose is increased, minimum approved air flow may not be delivered to facepiece • Air line is vulnerable to damage, mechanical contamination, and degradation; decon may be difficult • Worker must retrace steps to leave work area • Requires supervision / monitoring of air supply line (manpower) • Not approved for use in IDLH atmospheres unless equipped with an emergency egress unit such as an escape-only SCBA with a minimum five minute duration This last point is extremely important because almost all chemical emergency response requires entry into an IDLH atmosphere or an atmosphere that must be assumed to be IDLH. Air Purifying Respirator (APR) Air purifying respirators, sometimes known as cartridge respirators do not supply fresh air like the PP SCBA and PP SAR. Instead they filter the air the user draws through the nosepiece. They can be full-face or half-face configurations. They are not commonly considered a tool for emergency responders, who respond to uncontrolled (and in many cases, unknown) releases of hazardous materials. They are usually used by clean-up contractors or other industry workers who work in controlled, well characterized areas. Module 7: Personal Protective Equipment 7-17
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Module 7 - IAFF

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