1 Cargo tank structure heating arrangement power supply (paragraph 4.19.1.6)
1.1 The heating system referred to in paragraph 4.19.1.6.1 should be such that, in case
of a single failure of a mechanical or electrical component in any part of the system,
heating can be maintained at not less than 100% of the theoretical heat requirement.
1.2 Where the above requirements are met by duplication of the system components, i.e.
heaters, glycol circulation pumps, electrical control panel, auxiliary boilers, etc.,
all electrical components of at least one of the systems should be supplied from the
emergency source of electrical power.
1.3 Where duplication of the primary source of heat, e.g. oil-fired boiler is not
feasible, alternative proposals can be accepted such as an electric heater capable of
providing 100% of the theoretical heat requirement provided and supplied by an
individual circuit arranged separately on the emergency switchboard. Other solutions may
be considered towards satisfying the requirements of paragraph 4.19.1.6.1, provided a
suitable risk assessment is conducted to the satisfaction of the Administration. The
requirement in paragraph 2 of this interpretation should continue to apply to all other
electrical components in the system.
2 Fire test for emergency shutdown valves (paragraph 5.13.1.1.4)
"Emergency shutdown valves, with materials having melting temperatures lower than 925°C",
should not include an emergency shutdown valve in which components made of materials
having melting temperatures lower than 925°C do not contribute to the shell or seat
tightness of the valve.
3 Survival craft protection (paragraph 11.3.1)
3.1 With reference to sub-paragraph .7 of IGC Code, paragraph 11.3.1, the survival craft
on board, including remote survival craft (SOLAS regulation III/31.1.4) facing the cargo
area, should be protected by a water-spray system, taking into consideration cargo area
extension for fire-fighting purposes as stated in paragraph 11.1.4.
3.2 Remote liferafts located in areas covered by water-spray protection as required in
sub-paragraph .6 may be considered as adequately protected.
4 Tank groups in cargo area (paragraph 11.3.3)
4.1 The expression "two complete athwartship tank groupings" in sub-paragraph .1 of IGC
Code, paragraph 11.3.3 means any two groups of tanks where one group is defined as tanks
located in transverse direction from ship side to ship side. Where there is only one
cargo tank occupying a hold space from ship side to ship side, it should be considered
as a "grouping" for the purpose of this interpretation.
4.2 "Any two complete athwartship tank groupings" should represent an area equal to the
combined area of the two largest tank groupings, including any gas process units within
these areas.