Section 1A(33)(d) in The Merchant Shipping (Prevention of Pollution by Oil from Ships) Rules, 2010
(d)which has undergone a major conversion.-(i)for which the contract is placed on or before the 1st June, 1979; or(ii)in the absence of a contract, the construction work of which is begun on or before the 1st January, 1980; or(iii)which is completed on or before the 1st June, 1982.