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Evaluation of inshore skimmers
Solsberg, LB | Verjee, F
ENVIRONMENT CANADA, OTTAWA, ON (CANADA). Vol. 1, pp. 519-530.
1994.
Five disc and two weir skimmers were tested on behalf of the
Canadian Coast Guard between April and June, 1993. Testing took
place in North Vancouver, B.C. in a purpose-built outdoor tank
using diesel, fresh crude and emulsified crude oil. Oil Recovery
Efficiency (% oil in collected liquid) and Oil Recovery Rate (oil
skimmed per unit time) were measured in calm, regular wave and
harbour chop conditions. A qualitative assessment of operational
features of each skimmer was also conducted. The skimmers tested
included the Morris Industries MI-30, Ro-Clean Ro-Disc 15, Vikoma
T-Disc T18, Vikoma Komara 30K, and AB Pharos Marine Harbour Mate.
Technical problems with the Vikoma Sea Devil, a toothed-disc unit,
and the Foilex Amalia, a self-levelling weir, limited their
evaluation to qualitative assessment only. Oil Recovery Efficiency
(ORE) of the disc skimmers tested varied less than 10%, with the
MI-30 consistently showing the highest ORE throughout testing. Oil
Recovery Rate (ORR) for all skimmers peaked in thicker slicks and
at pre-determined disc rotation speeds, with the Komara 30K
posting the highest overall ORR, and the T-Disc T18 the highest
ORR per disc. In a series of tests designed to compare performance
of the T-disc versus straight disc, the Morris MI-30 straight disc
skimmer recovered fresh and emulsified crude oil at a higher rate
than the T18, although both skimmers performed similarly in
diesel. While the MI-30 had a higher ORE in thin slicks of diesel
and fresh crude, the T18 had higher efficiency in emulsions. The
Harbour Mate weir skimmer performed consistently throughout
testing but recovered liquid with a low oil content, particularly
in thin slicks and waves.
 Descriptors: Article Subject Terms cleanup operations | emergency vessels | oil pollution | oil removal | oil spills | performance assessment | pollutant
removal | pollution control | pumping | ships | testing procedures
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