(1) The coamings of hatchways shall be of substantial
construction in accordance with their position, and their height above
the deck shall be at least as follows:
(2) In the case of hatchways which comply with regulation 16 (2) through (5), the height of
these coamings may be reduced, or the coamings omitted entirely, on
condition that the Administration is satisfied that the safety of
the ship is not thereby impaired in any sea conditions.