46 CFR §54.01-2

1. (a)Pressure vessels must be designed, constructed, and inspected in accordance with Section VIII of the ASME BPVC (incorporated by reference, see § 54.01-1), as limited, modified, or replaced by specific requirements in this part. The provisions in the appendices to Section VIII of the ASME BPVC are adopted and must be followed when the requirements in Section VIII make them mandatory. For general information, table 1 to § 54.01-2(a) lists the various paragraphs in Section VIII of the ASME BPVC that are limited, modified, or replaced by regulations in this part.
2. (b)References to the ASME BPVC, such as paragraph UG-125, indicate:
   1. (1)U = Division 1 of Section VIII of the ASME BPVC.
   2. (2)G = Part containing general requirements.
   3. (3)125 = Paragraph within part.
3. (c)When a paragraph or a section of the regulations in this part relates to material in Section VIII of the ASME BPVC, the relationship with the code will be shown immediately following the heading of the section or at the beginning of the paragraph, as follows:
   1. (1)(Modifies U__.) This indicates that the material in U__ is generally applicable but is being altered, amplified or augmented.
   2. (2)(Replaces U__.) This indicates that U__ does not apply.
   3. (3)(Reproduces U__.) This indicates that U__ is being identically reproduced for convenience, not for emphasis.