Answer
ANS SOLAS Ch II-1, Reg. 3-1 states that, in addition to the requirements of the other (SOLAS) regulations, ships shall be designed, constructed and maintained in compliance with the structural, mechanical and electrical requirements of a Classification Society which is recognized by the Admin in accordance with the provisions of regulation XI/1(RO Code), or with applicable national standards of the Admin which provide equivalent level of safety. Hence may not need the CLASS.