... conveying systems, sieving operations, and grinding, mixing and dust collecting systems. 1.4.3 PREVENTING EXPLOSIBLE DUST CLOUDS 1.4.3.1 lnerting by adding inert gas to the air The influence ... routines, includes: 0 Smoking. 0 Openflames. Open light (bulbs). 0 Welding (gadelectric). 0 Cutting (gashotating disc). 0 Grinding. The second group arises within the process itself and includes: ... clouds in air of wheat grain dust containing 10% moisture; length of ) ( starch in a large-scale (23 6 m3) silo. The compressed air for flushing the glass windows of the probe was introduced...