For the purpose of calculation of the hypothetical oil outflow
for combination carriers:
-
.1 the volume of a cargo tank should include the
volume of the hatchway up to the top of the hatchway coamings, regardless
of the construction of the hatch, but may not include the volume of
any hatch cover; and
-
.2 for the measurement of the volume to moulded
lines, no deduction should be made for the volume of internal structures.