10.2.1 Details
of the design and construction of the fuel gas burning equipment for
steam boilers, oil and gas heater furnaces, reformers, etc. are to
be in accordance with the Rules and Regulations for the Construction and Classification of Ships for the Carriage of Liquefied Gases in Bulk, July 2022, or with agreed codes and specifications normally used
for similar plants in land installations, suitably modified and/or
adapted for the marine environment. Ignition of the burners is to
be by means of permanently installed igniters, or properly located
and interlocked pilot burners and main burners arranged for sequential
ignition.
10.2.2 Gas
or gas/air mixtures having relative densities compared with that of
air at the same temperature greater than one are not to be used as
fuels for fired pressure vessels situated below deck. Proposals to
burn such mixtures above deck will be specially considered in each
case.
10.2.3 Proposals
for the furnace purging arrangements prior to ignition of the burners
are to be submitted. Such arrangements are to ensure that any accidental
leakage of product liquid or gas into the furnace, from a liquid or
gas heating element, or from the accidental ingestion of flammable
gases and/or vapours, does not result in hazardous conditions.
10.2.4 Compartments
containing fired pressure vessels, heaters, reformers, etc. for heating
or processing hazardous substances are to be so arranged that the
compartment in which the fired equipment is installed is maintained
at a higher pressure than the combustion chamber of the equipment.
For this purpose, induced draught fans or a closed stokehold system
of forced draught may be employed. Alternatively, the fired equipment
may be enclosed in a pressurised air casing.
10.2.5 The
fired equipment is to be suitably lagged. The clearance spaces between
the fired equipment and any tanks containing oil are to be not less
than 760 mm. The compartments in which the fired equipment is installed
are to be provided with an efficient ventilating system.
10.2.6 Smoke
box and header box doors of fired equipment are to be well-fitting
and shielded, and the uptake joints made gastight. Where it is proposed
to install dampers in the uptake gas passages of fired equipment,
the details are to be submitted. Dampers are to be provided with a
suitable device whereby they may be securely locked in the fully open
position.
10.2.7 Each
item of fired equipment is to have a separate uptake to the top of
the stack casing. Where it is proposed to install process fired equipment
with separately fixed furnaces converging into a convection section
common to two or more furnaces and/or a secondary radiant section
at the confluence of the fired furnace uptake to the convection section,
the proposed arrangements, together with the details of the furnace
purging and combustion controls, are to be submitted.