Supplied Air Respirator Systems:
a.
Provide equipment capable of producing air of the quality and volume
required by the reference standards applied to the job site conditions and
crew size. Comply with provisions of this Specification, if more stringent
than the governing standard.
Face Piece and Hose: Provide full face piece and hose by same
manufacturer that has been certified by NIOSH/MSHA as an approved
Type "C" respirator assembly with a full facepiece operating in pressure
demand mode with an auxiliary positive pressure self-contained breathing
apparatus.
Backup air supply: Provide a reservoir of compressed air (Grade "D"
breathing air or better) located outside the Work Area which will
automatically maintain a continuous uninterruptable source of air
automatically available to each connected face piece and hose assembly in
the event of compressor shut-down, contamination of air delivered by
compressor, power loss or other failure. Provide sufficient capacity in the
back-up air supply to allow a minimum escape time of one-half hour times
the number of connections available to the Work Area. Air requirement at
each connection 1s the air requirement of the respirators in use plus the air
requirement of an average sized adult male engaged in moderately
strenuous activity.
Warning device: Provide a warning device that will operate independently
of the building's power supply. Locate so that alarm is clearly audible
above the noise level produced by equipment and work procedures in use,
in all parts of the Work Area and to the compressor. Connect alarm to
warn of:
° Compressor shut down or other fault requiring use of backup air
supply.
° Carbon Monoxide (CO) levels in excess of 5 PPM.
Carbon Monoxide (CO) Monitor: Continuously monitor and record on a
strip chart recorder Carbon Monoxide (CO) levels. Place monitors in the
air lines between compressor and back-up air supply and between backup
air supply and workers. Connect monitors so that they also sound at the
levels specified under "Warning Devices".
Compressor Shut Down: Interconnect monitors, alarms and compressor
so that compressor is automatically shut down and the alarms sounded if
any of the following occur:
02111-25
