46 CFR §127.210

1. (a)Except as provided by paragraphs (b) and (c) of this section, compliance with the construction and structural rules established by the American Bureau of Shipping and incorporated by reference in § 125.180 is acceptable for the design and construction of an OSV.
2. (b)The current standards of other recognized classification societies, or any other established current standard, may also be used upon approval by the Commandant (CG-ENG).
3. (c)If no established current standard for design is used, detailed design calculations must be submitted with the plans required by § 127.110 of this part.
4. (d)The plans required by § 127.110 of this part should specify their standard for design.