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Dust and electrostatic hazards, could we improve the current standards?
Dust explosions are recognised as major industrial hazards. A number of causes can trigger a dust explosion. Static electricity is one of the ignition sources. The current safety standards for determining electrostatic ignition hazards of dusts, such as electrical resistivity and charge decay time, are used in the process industries. Nevertheless, the standardisation of the proposed protocols suffers mainly from lack of defined experimental conditions. This paper is focused on the effect of time, voltage, temperature, relative humidity and compaction of the dust on the two precedent parameters. The obtained results clearly show the necessity to improve the current standards. A proposition to complete the conditions of the normalised protocols is suggested. As an example, a parametric study was conducted with two products: icing sugar (hydrophilic powder) and magnesium stearate (hydrophobic powder). Amelioration of the current standards could be done for instance with proposed values for sample preparation (conditioned at least 12 h at the right temperature and humidity), time before resistivity measurement (at least 60 s), resistivity voltages (at least 500 and 1000 V ), compaction (flush powder with a playing card), temperature and relative humidity (representative of the industrial process of the plant).
Dust and electrostatic hazards, could we improve the current standards?
Dust explosions are recognised as major industrial hazards. A number of causes can trigger a dust explosion. Static electricity is one of the ignition sources. The current safety standards for determining electrostatic ignition hazards of dusts, such as electrical resistivity and charge decay time, are used in the process industries. Nevertheless, the standardisation of the proposed protocols suffers mainly from lack of defined experimental conditions. This paper is focused on the effect of time, voltage, temperature, relative humidity and compaction of the dust on the two precedent parameters. The obtained results clearly show the necessity to improve the current standards. A proposition to complete the conditions of the normalised protocols is suggested. As an example, a parametric study was conducted with two products: icing sugar (hydrophilic powder) and magnesium stearate (hydrophobic powder). Amelioration of the current standards could be done for instance with proposed values for sample preparation (conditioned at least 12 h at the right temperature and humidity), time before resistivity measurement (at least 60 s), resistivity voltages (at least 500 and 1000 V ), compaction (flush powder with a playing card), temperature and relative humidity (representative of the industrial process of the plant).
Dust and electrostatic hazards, could we improve the current standards?
Staubexpolsionsgefahr durch elektrostatische Aufladung - Vorschlag zur Verbesserung der Prüfanweisung
Perrin, L. (Autor:in) / Laurent, A. (Autor:in) / Falk, V. (Autor:in) / Dufaud, O. (Autor:in) / Traore, M. (Autor:in)
Journal of Loss Prevention in the Process Industries ; 20 ; 207-217
2007
11 Seiten, 12 Bilder, 7 Tabellen, 26 Quellen
Aufsatz (Zeitschrift)
Englisch
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