Article,

Threshold Potentials and Discharge Charge Transfers for the Evaluation of Electrostatic Hazards in Road-Tanker Loading

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Journal of Electrostatics, 26 (2): 157--173 (August 1991)
DOI: http://dx.doi.org/10.1016/0304-3886(91)90013-6

Abstract

The minimum surface potentials reported for the ignition of hydrocarbon vapours by discharges from liquid surfaces range from 25 to about 60 KV. In evaluating electrostatic ignition hazards, a suitable threshold value must be chosen from this range. In this paper the available results are reviewed and reasons for the spread of values suggested. It is demonstrated that the relevant threshold for the evaluation of electrostatic ignition hazards in road- or rail-tanker loading is about 60 kV. The lower thresholds arise from features of small-scale laboratory tests that do not occur in full-scale commercial tanker compartments. The threshold conditions for ignition are often expressed in terms of the charge transferred by the largest discharges that can occur. These results are also examined and it is shown that a threshold of about 80 nC is relevant to full-scale systems. Higher thresholds (up to 250 nC) may be found in smaller scale systems.

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