arpadveress 
There is a potential risk of explosion in industrial facilities wherever combustible dust is present, whether as a result of production or as a by-product.
Deposited combustible dust has a high potential for explosion. It can be deposited everywhere in the equipment room and, in the case of a primary explosion, it is dispersed and can lead to a chain reaction causing numerous successive explosions.
To prevent this danger to employees, the facility and the environment, it must be ensured that electrical equipment in these areas does not have any ignition sources.
Work areas are mostly classified as zone 21 or zone 22. Zone 20 is mostly limited to the interior of technical assemblies like silos or hoppers.
Occurrence of Potentially Explosive Dust Mixtures:
− The chemical industry
− The pharmaceutical industry (active ingredients and auxiliary materials)
− Power-generating companies or power plants (coal dust)
− Wood-working industry operations (wood dust in filters and silos)
− Metal-working industry operations (swarf in traps)
− Food and feed industries (dust from grains and sugar in filters)
− Industries that use plastic granulates
Source: scalenet
Many believe in coating industries if they change from solvents to dust, case is solved – is it? Not at all.
Keep up good work!
Arpad
