46 CFR §72.05-1

1. (a)The provisions of this subpart apply to the following vessels:
   1. (1)All vessels of 100 gross tons or more.
   2. (2)All vessels with overnight accommodations for more than 150 passengers.
   3. (3)All vessels on an international voyage.
2. (b)The provisions of this subpart, with the exception of § 72.05-90, apply to all vessels noted in paragraph (a) of this section contracted for on or after May 26, 1965. Such vessels contracted for prior to May 26, 1965, must meet the requirements of § 72.05-90.
3. (c)Vessels meeting the structural fire protection requirements of SOLAS, Chapter II-2, Regulations 5, 6, 8, 9, and 11 (incorporated by reference, see § 72.01-2), when combined with the stair requirements in § 72.05-20 may be considered equivalent to the provisions of this subpart.
4. (d)Vessels regulated under subchapter K of this chapter which carry more than 600 passengers or with overnight accommodations for more than 49 passengers must also meet the requirements for stairways, ladders and elevators in § 72.05-20 (see 46 CFR 116.438(a)).