The maximum filling limit of cargo tanks shall be so determined
that the vapour space has a minimum volume at reference temperature
allowing for:
-
.1 tolerance of instrumentation such as level
and temperature gauges;
-
.2 volumetric expansion of the cargo between the
PRV set pressure and the maximum allowable rise stated in 8.4; and
-
.3 an operational margin to account for liquid
drained back to cargo tanks after completion of loading, operator
reaction time and closing time of valves, see 5.5 and 18.10.2.1.4.