1. (a) Each tank vessel that does not carry a material listed in either Table 1 of part 153 or Table 4 of part 154 of this chapter may comply with this section in lieu of § 170.175 if it—

   1. (1) Is 150 gross tons or greater;
   2. (2) Is of ordinary proportions and form;
   3. (3) Has a flush weather deck, one or more longitudinal bulkheads, and no independent tanks; and
   4. (4) Is designed not to carry cargo above the freeboard deck.

2. (b) When doing the calculations required by §§ 170.170 and 172.065, the vertical center of gravity of a tank vessel in the lightweight condition must be assumed to be equal to the following percentage of the molded depth of the vessel measured from the keel amidship:

   1. (1) For a tank ship—70%.
   2. (2) For a tank barge—60%.
3. (c) As used in this section, molded depth has the same meaning that is provided for the term in § 42.13-15(e) of this chapter.

[CGD 79-023, 48 FR 51010, Nov. 4, 1983, as amended by CGD 85-080, 61 FR 944, Jan. 10, 1996]