Section 9(2)(o) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(o)Any part of the crew accommodation which is adjacent to any part (other than the crown) of a tank in which oil may be carried in bulk, shall be separated therefrom by a gastight steel division additional to the division which retains the oil. The Central Government may exempt any ship from the requirement of this clause if it is satisfied that the division which retains the oil is likely to remain oil tight under service conditions.