Artikel,

A study of electrical discharges in a charged water aerosol

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Journal of Physics D: Applied Physics, 6 (8): 966--975 (21~May 1973)
DOI: http://dx.doi.org/10.1088/0022-3727/6/8/309

Zusammenfassung

The electrical and atmospheric conditions found within very large crude carriers during tank-washing operations have been reproduced in the laboratory. Two sources of electrical discharge which are likely to be present in a ship's tank are studied in detail -- with particular emphasis on their incendivity. A corona-type discharge was found to occur wherever water dripping was present, for example from any protrusion into the tank structure such as a walkway, stairway or strengthening structure. With an isolated 'slug' of water or metal arranged to glance the same protrusion, a much more intense discharge occurred between the protrusion and the 'slug'. From these two practically important discharge sources the results clearly indicate that the corona discharges are not an ignition hazard, under normal operating conditions. On the other hand, it is evident that the energies involved with the falling 'slug' discharges are in excess of the minimum ignition energy for a representative tanker atmosphere.

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