Wet precipitator is an air pollution control device that uses a spray water wash to cleanse the fume residue that is collected dry on precipitator plates. It is fabricated of stainless steel for corrosion resistance. They apply a water quench to the gas stream before entering the collecting tubes. They are used for the removal of liquid contaminants such as sulphuric acid mist, aerosols and dust particles. The precipitators are able to handle water vapour saturated gases. These precipitators do not require rapping mechanisms for removing the collected dust. The collected dust is removed from the collector's plates by flushing with a suitable liquid like water, either by intermittent or continuous spray irrigation wet precipitators. The spray or weir system is designed to remove efficiently all of the collector material from the collector plates and to drain in to the hoppers. They are used for very low emission requirements, including cleaning gases, such as blast furnace gas prior to combustion.