Piping Purification Design and construction 2 Drainage 2 Heat 2 Plumbing 2 Steam engineering 2 mer ... Transmission 2 Water 2 Water-supply engineering 2 Actuators 1 Air conditioning 1 Air-compressors 1 Animal housing 1 Automatic control 1 Bearings (Machinery) 1 Belts and belting 1 Brakes 1 Clutches (Machinery) 1 Combined cycle power plants 1 Combustion 1 Compressed natural gas 1 Condensers (Steam) 1 Drinking water 1 Energy conservation 1 Environmental engineering 1 Equipment and supplies 1 Feed-water heaters 1 Fluid mechanics 1 Flywheels 1 mindre ...