Dispersion in hazardous areas
Combustible and potentially explosive substances such as gases, vapours or mist may occur in many areas of the chemical industry, in particular in the paint, ink and coating industry. The operating company must carry out a risk assessment to identify EX category zones relating specifically to the operation of the intended dispersion equipment. A zone plan must be prepared within the scope of the preparation of explosion‒protection documents for the use of machines in these hazardous areas.
The zone division is based on the probability and frequency of a potentially explosive atmosphere and includes 3 zones. The DIN EN 60079-10 European standard provides support for the zonal classification. Refer to the 1999/92/EC Directive for a definition of the zones.
According to this classification, the resulting device category for the dispersion machine to be used can be determined.
Among others, this is a requirement for the selection of an explosion‒proof dissolver or a bead mill.
| Category 1 | Category 2 | Category 3 | |
|---|---|---|---|
| <strong>Hazard</strong> | permanent, frequent or over an extended time | occasionally | rarely and for a short time |
| <strong>Requirement</strong> | very high safety | high safety | normal safety |
| <strong>Zone / Substance group</strong> | Zone 0 / Gas Zone 20 / Dust | Zone 1 / Gas Zone 21 / Dust | Zone 2 / Gas Zone 22 / Dust |
Temperature classes and explosion groups
Refer to temperature classes and explosion groups for an assignment of gases and vapours.
| Explosion group | T1 >450°C | T2 300 ‒ 450°C | T3 200 ‒ 300°C | T4 135 ‒ 200°C | T5 100 ‒ 135°C | T6 85 ‒ 100°C |
|---|---|---|---|---|---|---|
| <strong>IIA</strong> | acetone ethane ammonium benzol acetic acid carbon oxide methane methanol methyl chloride naphthalene phenol propane toluene | i-amyl acetate n-butane n-butyl alcohol cyclohexanol 1,2 -dichloroethane acetic anhydride | benzines diesel kerosene fuel oils n-hexane | acetaldehyde | ||
| <strong>IIB</strong> | city gas | ethylene | hydrogen sulphide | ethyl ether | ||
| <strong>IIC</strong> | hydrogen | acetylene | carbon disulphide |
DISPERMAT® and TORUSMILL®
Durable and highly efficient dispersers, mixers, stirrers, basket mills and bead mills in operation worldwide
VMA‒GETZMANN develops, produces and markets high quality dispersers, mixers, stirrers, bead mills and basket mills. The innovative combination of technology and design as well as high quality are characteristic of our products. Of course, our mixing, dispersing and grinding equipment have integrated safety devices according to the EC Machinery Directive 2006/42 / EC.
Working together with the client our specialists optimize the essential process engineering and the most suitable system solution. Our involved development and design team comes with innovative ideas and long time experience in the mixing, dispersing and grinding technology. We produce with the most modern machine tools and therefore we guarantee a high standard of quality. We prove our expertise and reliability by also having an excellent after sales service.
Our experience ‒ Your advantage
Please visit us in our excellently equipped laboratory and pilot plant for a trial with your own products. We would be pleased to show you the impressive work section of our dispersing, mixing, stirring, homogenizing and fine grinding systems DISPERMAT® and TORUSMILL®. Our skilled engineers are available at any time for personal advice.