16.5.1 Each boiler should
have a separate uptake.
16.5.2 A system suitable
to ensure the forced draught in the boilers should be provided. The
particulars of such a system should be to the satisfaction of the
Administration.
16.5.3 Combustion chambers
of boilers should be of suitable form such as not to present pockets
where gas may accumulate.
16.5.4 The burner systems
should be of dual type, suitable to burn either oil fuel or gas fuel
alone or oil and gas fuel simultaneously. Only oil fuel should be
used during manoeuvring and port operations unless automatic transfer
from gas to oil burning is provided in which case the burning of a
combination of oil and gas or gas alone may be permitted provided
the system is demonstrated to the satisfaction of the Administration.
It should be possible to change over easily and quickly from gas fuel
operation to oil fuel operation. Gas nozzles should be fitted in such
a way that gas fuel is ignited by the flame of the oil fuel burner.
A flame scanner should be installed and arranged to assure that gas
flow to the burner is cut off unless satisfactory ignition has been
established and maintained. On the pipe of each gas burner a manually
operated shut-off valve should be fitted. An installation should be
provided for purging the gas supply piping to the burners by means
of inert gas or steam after the extinguishing of these burners.
16.5.5 Alarm devices should
be fitted in order to monitor a possible decrease in liquid fuel oil
pressure or a possible failure of the related pumps.
16.5.6 Arrangements should
be made that, in case of flame failure of all operating burners for
gas or oil or for a combination thereof, the combustion chambers of
the boilers are automatically purged before relighting. Arrangements
should also be made to enable the boilers to be manually purged.