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 Air System (Continued)
DON'T
DO
Ensure that new piping systems meet the o
Rerate air systems without insuring that
o
all components have design operating
material requirements for air systems.
pressure ratings equal to, or in excess of,
the new pressure, otherwise remove
o
Allow at least two threads to project
them from the system.
beyond nuts or threaded flanges on bolt-
assembled components. Cut off excess
o
Assume backup air supply is adequate as
bolt length where not required.
to quantity and quality. Provide
calculations and air sample test results.
o
Provide for blowdown of air supply
filters every hour of compressor
o
Operate system with missing valve
operation, or as recommended by
handwheels.
manufacturer.
o
Install filters backwards. Check the flow
o
Use only approved air system filters.
directions shown on the filter or
manufacturer's specification.
Recompression
Chamber
DON`T
DO
o
Have relief valve exhaust directed
o Have chamber relief valve setting and
towards personnel.
date of test shown on valve.
o
Leave the deck plates loose so that they
o Conduct chamber pressure tests with air
could possibly accumulate a static
per the U.S. Diving Manual.
electric charge that on discharge could
serve as an ignition source. Bolt them
o Have chamber relief valve gage valve
down.
installed and wired open and warning
plate Installed.
o
Have primary chamber support system
that requires more than three (3)
o Ensure that doors and door dogs operate
minutes to pressurize inner chamber lock
smoothly without binding, misalignment
to 165 fsw.
or interference. Effect a seal quickly and
at low pressure.
o
Neglect medical locks. Keep them clean
and leak-tight. Keep special wrenches
required for operation at the locks.
D-5
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