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Hyperbaric Chamber BIB System, R. Johnston
CASE M17 -
Potential loss of O2 breathing capability.
No oxygen to chamber BIB system.
Collection of Facts: Some chamber O2 systems are built with a single
in-line regulator.  In the event that the regulator fails, there is often no
bypass or system redundancy to permit continued O2 treatment. The only
alternative would then be to shift to a less effective Air Treatment Table.
Solution:  Design O2 systems with redundant regulators and valves permitting
shifting of O2 supply from one bank to another, or provide a bypass with
needle valve around the regulator.
CASE M18 - Hyperbaric Recompression Chambers, R. Johnston
Recompression chambers lacking Ground Fault Protectors.
Symptom:  Fire or shock due to possibility of electrical spark in the event of
line-to-ground fault in the chamber electrical system.
Collection of Facts:  Recent inspections have revealed that some chambers lack
ground fault protection.  Chamber grounding systems may be vulnerable to
moisture or other deterioration.
Solution:  Require that Ground Fault Circuit interruption be installed on
chamber electrical systems.
CASE M19 - Hyperbaric Pressure Relief/Safety Valves, R. Johnston
Poor location of pressure relief/safety valves.
Personnel injury resulting from high pressure air.
Collection of Facts:  Pressure relief valves are occasionally installed with
their discharge ports inadvertently oriented so that high pressure air may be
directed towards operating personnel.
Solution:  Exercise care in installation of pressure relief valves. If
possible, orient discharge ports away from personnel traffic or provide
deflectors to harmlessly direct air away from personnel.

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