Section 26(4)(c) in The Merchant Shipping (Prevention of Pollution by Oil from Ships) Rules, 2010
(c)Where two or more longitudinal bulkheads are provided inside the cargo tanks.-(i)for wing cargo tanks: 0.2L(A)if Bi/B is equal to or greater than one fifth: 0.2L(B)if Bi/B is less than one fifth-(I)where no centerline longitudinal bulkhead is provided:(ii)for centre cargo tanks.-