DSEAR – Hazardous Area Classifications

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Hazardous Area Classification (HAC) for explosive gas atmospheres is well established, with guidance published in various standards and industry codes of practice.  One of these documents, BS EN 60079-10-1:2009 makes use of the concept of a nominal flammable gas cloud volume Vz to determine the level of ventilation and hence the zone.  However, it has been shown that the critical formulae given in the standard to estimate Vz have no scientific justification and therefore provides arbitrary results.

Other calculations based on simple well established jet model theory, validated against experimentally validated Computational Fluid Dynamics (CFD) has been shown to provide solutions that are significantly lower (and potentially less onerous and costly) than those resulting from the use of the methodology in the standard  BS EN 60079-10-1:2009.

Contact us if you wish to learn more about this alternative methodology.