46 CFR §170.105

1. (a)Except as provided in paragraph (b) 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 less than 150 gross tons.
   3. (3)A tank barge that—
      1. (i)Operates only in rivers or lakes, bays, and sounds service;
      2. (ii)Does not have to meet 33 CFR part 157, subpart B; and
      3. (iii)Only carries a product listed in § 30.25-1 of this chapter.
   4. (4)A sailing school vessel that is an open boat that complies with the requirements in § 173.063(e) of this subchapter.
   5. (5)A small passenger vessel inspected under subchapter T of this chapter if § 178.210(c) of this chapter is applicable.