(a) This subchapter prescribes rules for the design, construction, equipment, inspection and operation of mobile offshore drilling units operating under the U.S. flag.
(b) The regulations in this part have preemptive effect over State or local regulations in the same field. [CGD 73-251, 43 FR 56802, Dec. 4, 1978, as amended by USCG-2006-24797, 77 FR 33881, June 7, 2012]