Air Separation Column

Air separation column (cold box) consists of outer steel casing, Main heat exchangers, Bottom column, Top column, Condensor, Sub-coolers, Liquid nitrogen Tank. Expansion Valves, Drain & Analysis Valves, Niddle Valves Insulation material, Digital electronic temperature indicator & scanner, PT 100 sensors, Differential Pressure level Indicator.

The expanded air leaving from the Expansion Engine & Air Expansion valve enters Air Separation Unit. The rich liquid containing Oxygen & Nitrogen is collected in Lower column having more than 40% O². The rich liquid from the lower column is taken to the upper column through RL Expansion Valve. The Poor Liquid (PL) collected on the bottom cone of Condensor is taken to upper column through PL Expansion Valves in this process pressure is dropped 4.5 kg/Cm² to 0.5kg/Cm² g in upper column . The Nitrogen being more volatile come out and oxygen getting condensed and collected in condenser from where it is pumped by LO²/LIN Pump in to cylinders.

• Temperature Scanner
• Liquid Level Gauge
• RTD Sensor
• Pressure Gauges
• Expansion valves
• Needle Valves.
• Drain & Analysis's Valve.
• Perlite Powder
• Top Column safety Valves --(0.65 Kg/Cm²)
• Bottom Column safety valve – (6.5 kg/Cm² )
• High Pressure Safety Valves – ( 165 Kg/Cm² )