Section 31.30-1 - Marine engineering regulations and material specifications-TB/ALL(a) All tank vessels are subject to the regulations contained in parts 50 to 63, inclusive, of subchapter F (Marine Engineering) of this chapter, whenever applicable, except as such regulations are modified by the regulations in this subchapter for tank vessels.CGFR 68-82, 33 FR 18804, Dec. 18, 1968