Where hatchways are fitted with coamings of standard height,
no extra strengthening (beyond what is required in the Load Line Convention)
should be required for covers loaded with cargo, even dense cargo,
provided the load does not exceed 1.75 tonnes/m2 (in position
1).
No extra strengthening is recommended for hatchway covers
on vessels which are assigned freeboards less than those based on
Table B, except for flush hatchway covers which are fitted on the
freeboard deck forward of the quarter length, in which case the section
modulus and the moment of inertia should be increased 15% over that
required by regulation 16.