Study of dust

Many types of industrial dusts (delivered to production process as substrate or generated as byproduct), at a sufficient concentration generate hazard of explosion (when ignition source and access to air is provided). Flammability and explosiveness parameters of dust have to be recognized, as risk assessment and adequate protection against explosion or fire in installation can be provided. 

The most representative sample of dust being studied is one downloaded directly from installation or settled one, in an amount of 2 – 4 kg. Before study starts, CORONA prepares a sample properly, providing moisture content (and dispersion of dust particles, when needed) examination. Moisture content lower than 10% qualifies the dust to further examination.

We provide dust examination in terms of:

Maximum pressure of explosion pmax and maximum rate of explosion pressure rise Kst,max

  • EN 14034-1:2004+A1:2011 Determination of explosion characteristics of dust clouds – Part 1: Determination of the maximum explosion pressure pmax of dust clouds
  • EN 14034-2:2006+A1:2011 Determination of explosion characteristics of dust clouds – Part 2: Determination of the maximum rate of explosion pressure rise (dp/dt)max of dust clouds 

 

Lower Explosion Limit LEL

  • EN 14034-3:2006+A1:2011 Determination of explosion characteristics of dust clouds – Part 3: Determination of the lower explosion limit LEL of dust clouds

 

Minimum Ignition Temperature of a Dust Cloud TCL

  • PN-EN 50281-2-1:2002 Electrical apparatuses for use in the presence of combustible dust. Part 2-1: Test methods – Methods for determining the minimum ignition temperatures of dust.

 

Minimum Ignition Temperature of a Dust Layer T5mm

  • PN-EN 50281-2-1:2002 Electrical Apparatus For Use In The Presence Of Combustible Dust – Part 2-1: Test Methods – Methods Of Determining The Minimum Ignition Temperature Of Dust

 

Minimum of ignition energy (MIE) (with or without inductance) – marking MIE in both ways

  • PN-EN 13821:2003: Potentially explosive atmospheres – Explosion prevention and protection – Determination of minimum ignition energy of dust/air mixtures

 

The self-ignition temperatures of dust layer TSI

  • PN-EN 15188:2009 Determination Of The Spontaneous Ignition Behaviour Of Dust Accumulations

 

Upper explosion limits in air LOC

  • PN-EN 14034-4+A1:2011: Determination of explosion characteristics of dust clouds – Part 4: Determination of the limiting oxygen concentration LOC of dust clouds

 

Determination of dust explosion classes

  • VDI 2263, Ad.Kuhner AG1991

 

Electrical Resistivity of dust in layers

  • EN 61241-2-2 Electrical apparatus for use in the presence of combustible dust. Test methods– Part 2: Method for determining the electrical resistivity of dust in layers
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