The master of a tank vessel with segregated ballast tanks or dedicated clean ballast tanks under Sec. 157.09, Sec. 157.10, Sec. 157.10a(a)(1), Sec. 157.10a(b), Sec. 157.10a(c), Sec. 157.10b(a), Sec. 157.10c(b)(1), or Sec. 157.10c(c) shall ensure that ballast water is carried in a cargo tank only if--
(a) The vessel encounters abnormally severe weather conditions;
(b) More ballast water than can be carried in segregated ballast tanks or dedicated clean ballast tanks is necessary for the safety of the vessel;
(c) The ballast water is processed and discharged in compliance with Sec. 157.37; and
(d) On a new vessel under Sec. 157.10 that carries crude oil, the ballast water is only carried in a cargo tank that is crude oil washed in accordance with Subpart D of this part during or after the most recent discharge of crude oil from that tank. [CGD 77-058b, 45 FR 43708, June 30, 1980, as amended by CGD 82-28, 50 FR 11626, Mar. 22, 1985]