46 CFR §170.160

1. (a)Except as provided in paragraphs (b) through (d) of this section, this subpart applies to each vessel.
2. (b)This subpart does not apply to any of the following vessels unless the stability of the vessel is questioned by the OCMI:
   1. (1)A deck cargo barge that complies with the requirements in § 174.020 of this chapter.
   2. (2)A tank vessel that only carries a product listed in § 30.25-1 of this chapter and that is—
      1. (i)Less than 150 gross tons; or
      2. (ii)A tank barge that operates only in river or lakes, bays, and sounds service.
   3. (3)A sailing school vessel that is an open boat that complies with the requirements in § 173.063(e) of this subchapter.
3. (c)This subpart does not apply to the following vessels:
   1. (1)A tank barge that carries a product listed in Table 151.05 of this chapter.
   2. (2)A mobile offshore drilling unit.
   3. (3)A vessel that performs one of the simplified stability proof tests described in subpart C of part 178 of this chapter.
4. (d)A vessel that complies with § 170.165 of this part need not comply with §§ 170.170 and 170.173 of this part.