2. Procedure. Protective location of segregated ballast tanks, voids, and other spaces that do not carry cargo which are within the cargo tank length is determined from the following:
(a) Method of determining a value for J.
(1) For tank vessels for 20,000 DWT, J = 0.45.
(2) For tank vessels of 200,000 DWT or more:
(i) J = 0.30; or
(ii) J = the greater of 0.20, or