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This is the service specification prepared and published by DNV-GL class society to outline the alternative regulatory roadmap for the operators and owners of the FOI (floating offshore installations), FSO (floating storage units) and FPSO (floating production, storage, and offloading units) willing to engage in OCS (outer continental shelf) activities in the Mexican Gulf.It is based on the DNV-GL class rules and identifies the USCG requirements concerning design and equipment of such units not covered by these Rules. The specification provides a classification-based verification scheme for US compliance for the above stated types of offshore units. The first part of the specification provides general info on the principles and procedures for meeting the level of safety equivalent to the requirements of USCG, as well as legal provisions; the second part of the book provides applicable design and equipment requirements for same, consisting of the introductory part separate for each type of the unit, and compliance matrix. There is also informative section describing the equivalencies and other design considerations, such as passive ballast systems, external impact load on hull, fire protection boundaries, platform verification program etc. The appendix contains the Policy Letter released by the USCG.