16.4.1 All equipment (heaters,
compressors, filters, etc.) for making up the gas for its use as fuel,
and the related storage tanks should be located in the cargo area
in accordance with paragraph 3.1.5.4. If the equipment is in an enclosed
space, the space should be ventilated according to section 12.1 of the Code and be equipped
with a fixed fire-extinguishing system according to section 11.5 and with a gas detection system
according to section 13.6, as applicable.
16.4.2 The compressors should be capable of being remotely
stopped from a position which is always and easily accessible, and also from the
engine-room. In addition, the compressors should be capable of automatically stopping
when the suction pressure reaches a certain value depending on the set pressure of the
vacuum relief valves of the cargo tanks. The automatic shutdown device of the
compressors should have a manual resetting. Volumetric compressors should be fitted with
pressure relief valves discharging into the suction line of the compressor. The size of
the pressure relief valves should be determined in such a way that, with the delivery
valve kept closed, the maximum pressure does not exceed by more than 10% the maximum
working pressure. The requirements of 5.6.1.3 apply to these compressors.
16.4.3 If the heating medium
for the gas fuel evaporator or heater is returned to spaces outside
the cargo area it should first go through a degassing tank. The degassing
tank should be located in the cargo area. Provisions should be made
to detect and alarm the presence of gas in the tank. The vent outlet
should be in a safe position and fitted with a flame screen.
16.4.4 Piping and pressure
vessels in the gas fuel conditioning system should comply with chapter 5.