9.4.1 Inerting refers to the
process of providing a non-combustible environment by the addition
of compatible gases, which may be carried in storage vessels or produced
on board the ship or supplied from the shore. The inert gases should
be compatible chemically and operationally, at all temperatures likely
to occur within the spaces to be inerted, with the materials of construction
of the spaces and the cargo. The dew points of the gases should be
taken into consideration.
9.4.2 Where inert gas is also
stored for fire-fighting purposes, it should be carried in separate
containers and should not be used for cargo services.
9.4.3 Where inert gas is stored
at temperatures below 0°C, either as a liquid or as a vapour,
the storage and supply system should be so designed that the temperature
of the ship's structure is not reduced below the limiting values imposed
on it.
9.4.4 Arrangements suitable
for the cargo carried should be provided to prevent the backflow of
cargo vapour into the inert gas system.
9.4.5 The arrangements should
be such that each space being inerted can be isolated and the necessary
controls and relief valves etc. should be provided for controlling
pressure in these spaces.