Large air separation units operator in the medium pressure system filling pressure, found that the pressure on the side of the fine argon tower has been rising, the final judgment of the fine argon tower evaporator has a string of leakage. So the workers cut open the evaporator barrel and found that the non-condensable gas blow-off tube was leaking in at the gap between the outgoing barrel and the casing. At the end of the overhaul sand picking, workers found that the non-condensable gas blow-off tube is completely broken off from the barrel, so in welding according to the original position directly welded on. In fact, there is a casing outside the lead-in tube, and the blow-off tube is only welded together with the casing outside the barrel. The leadpipe inside the barrel was not welded to the casing. When the welder recovered, the disconnected blow-off tube was only welded to the outer casing and was not butt-welded to the non-condensable gas lead-in tube inside the casing. The new large air separation unit process now has the non-condensable gas lead pipe welded to the casing both inside and outside the barrel. The workers re-welded, re-inflated and checked the heat exchanger channels for string leaks. The workers did not see any leaks, so the aluminium chips from the cutting were vacuumed out and after sealing the evaporator barrel, all barrel welds were checked again during the pressure test.
DEAR's latest generation of intelligent air separation, can ensure that customers large air separation unit，small air separation unit and liquid air separation plant extraction rate increased by 4%, 100% trouble-free operation throughout the year, combined with DEAR has the advantage of energy-saving technology, compared with traditional large air separation unit，small air separation unit and liquid air separation plant energy consumption can be reduced by an average of 15%, saving customers tens of millions of dollars a year.
