A Category (1) oil tanker of 25 years and over after the date of its delivery shall comply with either of the following provisions:
(a) it shall have wing tanks or double bottom spaces, not used for the carriage of oil and meeting the width and height requirements of Regulation 13E(4) of Annex I of MARPOL 73/78, cover at least 30 % of Lt, for the full depth of the ship on each side or at least 30 % or the projected bottom shell area within Lt where Lt is as defined in Regulation 13E(2) of Annex I of MARPOL 73/78...
Segregated ballast tanks and spaces other than oil tanks within the cargo tank length (Lt) shall be so arranged as to comply with the following requirement...
