2.1.1 Estimation of machinery heat production and heat conduction through the
hull is to be confirmed before finalization of the system.
2.1.2 An outline of the facilities for the thermal protection of the divers in
the event of a power failure and/or a possible forced and prolonged stay is to be
provided.
2.1.3 The average rate of circulation of atmospheric gases in all manned
chambers is to be maintained at about 6 to 10 air changes per hour, while the air
flow passing personnel is to fall within the velocity range: 1 to 8 m/min. The
circulation rate in machinery chambers, battery chambers and other unmanned chambers
is to be agreed.
2.1.4 Materials producing atmospheric contamination are to be kept to a minimum
within the pressure hull to prevent build-up of toxic concentrations. Suitable
filters should be fitted in all necessary cases. Before initial operation and after
every refit, or after any internal painting, the atmosphere should be tested using a
wide-band analytical instrument. Finishes, such as paint containing lead and/or
certain toxic solvents, should not be used inside the pressure hull.
2.1.5 Pressure vessels, where leakage of the contents could produce an
uncontrolled atmosphere, are not to be stored within the hull or chamber or where
the pressure rise in the chamber could exceed 1 bar.
2.1.6 The overall design is to be such that an explosion, violent movement or
rapid build-up of pressure does not occur in the chamber under normal or abnormal
operating conditions.
2.1.7 Provision is to be made for the collection and containment of the waste
products of the crew and passengers within the submersible. Sufficient capacity
shall be provided for the normal operational time plus the time allowed for
emergency recovery.
2.1.8 Supplies of food and water are to be available within the submersible to
cater for the requirements of crew and passengers for normal operating time plus the
time allowed for emergency recovery.
2.1.9 Diving Systems are to be provided with safety interlocks where necessary
to prevent any unintentional or Uncontrolled loss of pressure Particular attention
should be directed to chamber/bell mating systems diver evacuation mating system,
toilet interlocks food, medical and equipment locks.
2.1.10 All components in a diving System or submersible are to be so designed,
constructed and arranged as to permit easy cleaning disinfecting, inspection and
maintenance.