Biogas blower 94/9/EC

centrifugalmulti-stageexplosion-proof

The combination of different impeller types, the possibility to match several stages (maximum 10) in series, and the wide speed of rotation range allows the coverage, with only one machine frame, a very large range of duty. Electric motors are flameproof, type of protection d, with specific marking Ex II 2 G, additional marking Ex-d IIB T3. If the area surrounding the equipment is classified as Zone 2, where, for the Group II, Category 3 equipments are accepted, the driving electric motors could be non-sparking, type of protection n, with specific marking Ex II 3 G, additional marking Ex-nA II T3. In some particular cases, the multistage centrifugal blowers can be fitted with lip seals in pairs, with a barrier fluid in between. Besides, all the static parts wetted by the gas can be treated with a protective coating using a nickel-plating chemical technique and the impellers can be treated with anodic oxidation