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suction stream was confined to very small slugs which sporadically blanked off the field of vision of the 3/8-in. diameter sight window in the photography cell.The results of the field sampling, while limited, indicated that the influent droplet size distribution used in the laboratory for the evaluation of oil scavenging devices was representative and slightly more severe than one would expect in practice-i.e., a greater fraction of the oil concentration is attributed to smaller size droplets in the laboratory system. It also appears that the oil concentrations (1000-2000 ppm) used in the lab were typical of practice. The laboratory system represented a conservative yet realistic basis of evaluation for candidate ballast water clarifiers.The field results also emphasized that a ballast water clarifier should possess the capability to handle oil fines, if it is to be located on-deck which, of course, will place it at the discharge side of a pump. The separation process would be measurably facilitated if suction-side clarification could be accommodated. However, such an approach is not practical with existing vessels, the design and oper-ation of which are generally not amenable to the introduction of additional equipment in the pump wells.

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