... rectification column,has minimal cooling lost,Shorten starting time. This Oxygen producing equipment exported to Iraq in 2009 Scope of supply: Screw ... Air compressor 1 set ,Purifier 1 set ,Turbine expander 1 set,Rectification Column 1 set ,Refrigerator 1 set , Liquid Oxygen Pump 1 set,Filling Unit 1 set,Connecting ...