For the purpose of this Code the
terms used have the meanings defined in the following paragraphs
unless expressly provided otherwise.
1.3.1  Administration means the
Government of the State whose flag a ship or floating structure
which carries a diving system is entitled to fly or in which the
ship or floating structure is registered.
1.3.2  Bottle means a pressure
container for the storage and transport of gases under pressure.
Breathing gas/breathing mixture means all
gases/mixtures of gases which are used for breathing during diving
Certificate means Diving System Safety Certificate.
compression chamber means a pressure vessel for human occupancy with
means of controlling the pressure inside the chamber.
1.3.6 Depth means
the water depth or equivalent pressure to which the diver is exposed
at any time during a dive or inside a surface compression chamber or
a diving bell.
Diving bell means a submersible compression chamber, including
its fitted equipment, for transfer of diving personnel under
pressure between the work location and the surface compression
Diving system means the whole plant and equipment necessary for the
conduct of diving operations.
220.127.116.11  Fixed system means diving system
installed permanently on ships or floating structures.
Temporary system means a diving system installed on
ships or floating structures for a period not exceeding one year.
Evacuation system means a system whereby divers under
pressure can be safely evacuated from a ship or floating structure
to a position where decompression can be carried out.
Handling system means the plant and equipment necessary
for raising, lowering and transporting the diving bell between the
work location and the surface compression chamber.
1.3.11  Hazardous areas
are those locations in which an explosive gas-air mixture is
continuously present, or present for long periods (zone 0); in which
an explosive gas-air mixture is likely to occur in normal operation
(zone 1 ); in which an explosive gas-air mixture it not likely to
occur, and if it does it will only exist for a short time (zone 2).
Life support system means the guts supply, breathing
gas system, decompression equipment. environmental control system
and equipment required to provide a safe environment for the diving
crew in the diving bell and the surface compression chamber under
all ranges of pressure and conditions they may be exposed to during
Living compartment means the part of the surface
compression chamber which is intended to be used as the main
habitation for the divers during diving operations and which is
equipped for such purpose.
1.3.14  Main components of a diving system
include the surface compression chamber, diving bell, handling
system and fixed gas storage facilities.
1.3.15  Mating device means the
equipment necessary for the connection and disconnection of a diving
bell to a surface compression chamber.
1.3.16  Maximum operating depth
of the diving system is the depth in metres or feet of seawater
equivalent to the maximum pressure for which the diving system is
designed to operate.
1.3.17  Organization means the
International Maritime Organization (IMO).
1.3.18  Pressure vessel means a
container capable of withstanding an internal maximum working
pressure greater than of equal to 1 bar.
1.3.19  Umbilical means the
link between the diving support unit and the diving bell and may
contain surveillance, communication and power supply cables,
breathing guts and hot water hoses. The heisting and lowering
strength member may be part of the umbilical.
1.3.20  Category A machinery
sparer are those spaces and trunks to such spaces as defined in the
International Convention for the Safety of Life at Sea, 1974, as