Water Purification 3 Fire prevention 2 Piping 2 Air 1 Air conditioning 1 Air-compressors 1 espandi ... Ash disposal 1 Bearings (Machinery) 1 Biological decontamination 1 Boilers 1 Cleaning 1 Combustion 1 Compressed air 1 Condensers (Steam) 1 Condensers (Vapors and gases) 1 Cooling towers 1 Corrosion and anti-corrosives 1 Decontamination (from gases, chemicals, etc.) 1 Design and construction 1 Diesel motor 1 Electricity 1 Environmental aspects 1 Environmental engineering 1 Environmental protection 1 Equipment and supplies 1 Fans 1 Fuel 1 Gas 1 Gas as fuel 1 riduci ...