Dustiness

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The dustiness ( English Dustiness ) of bulk materials is a characteristic size in the range of explosion and safety at work . This describes the tendency of materials to generate airborne dust when handled . It is not a self-determined variable, but a variable that depends on the respective measurement method.

meaning

When handling dusty goods, especially when they are handled, dust-laden atmospheres can form, which are problematic for reasons of both occupational safety and explosion protection. While from the point of view of explosion protection, the formation of an explosive dust-gas mixture must be avoided, the proportion of dust that can be assigned to the fractions inhalable , thoracic or alveolar must be reduced for reasons of occupational safety . In the case of fibrous materials, the possible release of fibers also plays a role.

Measurement

Measurement methods for determining dustiness are empirical methods that have to be adapted to the respective question. Accordingly, different measurement methods serve to simulate different handling or handling processes. In the standardization Various methods for the determination of dustiness have established.

To determine the dustiness in the area of ​​explosion protection, dust is transported into a measuring chamber at a constant volume flow by means of a conveying device and the dust concentration in the dust cloud that forms is recorded using measurement technology.

For the determination of the dusting behavior from the point of view of occupational health and safety, in addition to the continuous dusting of the bulk material by means of brush dispensers, processes in which the bulk material is dropped and at the same time exposed to an air flow are used.

literature

  • DIN EN 15051-1: 2014-03 Exposure at the workplace; Measurement of the dustiness of bulk solids; Part 1: Requirements and selection of test methods; German version EN 15051-1: 2013. Beuth Verlag, Berlin.
  • VDI 2263 sheet 9: 2008-05 Dust fires and dust explosions; Hazards - assessments - protective measures; Determination of dustiness of bulk materials (Dust fires and dust explosions; Hazards - assessment - protective measures; Determination of dustiness of bulk materials). Beuth Verlag, Berlin.

Individual evidence

  1. ↑ a b DIN EN 1540: 2012-03 Exposure at the workplace; Terminology; Trilingual version EN 1540: 2011. Beuth Verlag, Berlin, p. 15.
  2. ↑ VDI 3469 sheet 1: 2007-03 emission reduction; Manufacture and processing of fibrous materials; Fibrous dusts; Basics, overview (Emission control; Production and processing of fibrous materials; Fibrous dusts; Fundamentals, Overwiew). Beuth Verlag, Berlin, p. 5.
  3. ↑ Michael Fehlauer, Annette Lehrack: Test stand and results for the investigation of the dusting behavior of flours. In: Hazardous substances - cleanliness. Air . 63, No. 6, 2003, ISSN  0949-8036 , pp. 253-256.
  4. ↑ VDI 2263 sheet 9: 2008-05 Dust fires and dust explosions; Hazards - assessments - protective measures; Determination of dustiness of bulk materials (Dust fires and dust explosions; Hazards - assessment - protective measures; Determination of dustiness of bulk materials). Beuth Verlag, Berlin, p. 5.
  5. ↑ DIN 33897-1: 2016-08 workplace atmosphere ; Routine procedure for determining the dustiness of bulk materials; Part 1: Basics. Beuth Verlag, Berlin, p. 7.