Chapter 2
Cylinder and Components
24 SAFETY FIRST Edition 1 – December 2019
MSA G1 Electronic Breathing Apparatus
Pressure reducer
The pressure reducer reduces the cylinder pressure (300 bar) to a medium pressure,
which is in the range of 6 to 8 bar. The medium pressure is further reduced by the
demand valve to a pressure that is slightly above atmospheric pressure.
The pressure reducer:
has a flow capacity of 700 litres per minute at full pressure;
incorporates a fail-safe design which ensures air flow to the operator in the event of
a malfunction within the pressure reducer;
incorporates a medium pressure relief valve which operates in the range of 11 to
15 bar, and
a threaded cylinder connector with a sintered filter to capture particulates that may
be in the air stream.
The pressure reducer contains the primary low-pressure warning whistle (lpww). The
lpww activates when the cylinder air pressure reaches 55 +/- 5 bar and draws down
5 lpm of air when activated.
If the pressure relief valve operates:
withdraw to a safe location (COLD zone);
close the cylinder valve and continue breathing to relieve all air
pressure; and
open the cylinder valve slowly to see if the pressure relief valve is still
operating.
If the relief valve is still operating, withdraw the BA from service,
quarantine it and return to the Sate PPE&C Management Centre.
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