46 CFR §42.20-5

1. (a)Each Type “B” vessel is assigned a freeboard from table 42.20-15(b)(1) that is increased or decreased by the provisions of this section.
2. (b)Each Type “B” vessel that has a hatchway in position 1, must have the freeboard assigned in accordance with paragraph (a) of this section increased by the amount given in table 42.20-5(b) unless the hatch cover complies with:
   1. (1)Section 42.15-25(d); or
   2. (2)Section 42.15-30.
3. (c)Any Type “B” vessel that is greater than 100 meters (328 feet) in length and any hopper dredge meeting the requirements in subpart C of part 44 of this chapter may have a reduced freeboard from that assigned under table 42.20-15(b)(1) in accordance with paragraph (d) or paragraph (e) of this section if—
   1. (1)The measures provided for the protection of the crew are adequate;
   2. (2)The freeing arrangements are adequate; and
   3. (3)The hatchway covers in positions 1 and 2 comply with the provisions of § 42.15-30 and have adequate strength, special care being given to their sealing and securing arrangements.
4. (d)The freeboards for a Type “B” vessel which comply with paragraph (c) of this section may be reduced up to 60 percent of the total difference between the freeboards in table 42.20-15(b)(1) and table 42.20-15(a)(1) provided that the vessel meets the flooding standard in § 42.20-7.
5. (e)The freeboards for a Type “B” vessel which complies with paragraph (c) of this section may be reduced up to the total difference between the freeboard tables referenced in paragraph (d) of this section provided that the vessel meets the flooding standard in § 42.20-8 and the provisions of § 42.15-80 (a), (b) and (d) as if it were a Type “A” vessel.