The small air separation unit maintenance workers decided to temporarily shut down, export the gas in the tower, two argon pump cold box after picking sand, check the argon pump cold box in the liquid argon and to coarse argon tower valve, the valve after the indentation at the crack opening, low pressure system cold gas leakage. The inspector Personnel wrapped with non-woven cotton, the main tower to maintain a slight positive pressure, for local heating of the liquid argon pump after the main pipe. Open the instrument gas heating valve after the argon pump, remove the check valve spool after the pump and open the outlet valve.
Instrument gas argon pump export check valve, export valve fully open, the crude argon tower stop filling heating to wait for the pipeline to return to room temperature. Because the valve is usually in full open, so the pneumatic valve as a whole removed, replaced by an aluminium elbow and directly connected to the aluminium pipe, the pump main pipe with expansion joint function. Installation of the valve frame in the valve after this service, the valve seat will be fixed. Because the valve is too close to the cold box, it was not possible to add the same pre-valve and post-valve piping restrictions as the pneumatic valve in the main cold box. Two more fixed stands were added to the main pipe after the pump to the crude argon tower, and the pipe shrinkage pulling may be related to this. The small air separation unit continued to accumulate liquid, the tube continued to pre-cool, the small air separation unit all normal, output qualified oxygen and nitrogen for external gas supply.
At the operation and maintenance end, the AI intelligent remote operation and maintenance system of small air separation units, large air separation units and liquid air separation plants, independently developed by DEAR's air separation team, has made an industry-wide breakthrough in intelligent operation and maintenance, winning awards in various competitions at home and abroad for many times.
