The main elements of the analysis and development of the overhaul programme were
First open the upper manhole of the purifier and check the bed leveling situation. If the bed is uneven, rake the bed. Add a few more drums of new molecular sieves. If the bed is collapsed, the lower manhole needs to be opened. Depending on the location of the bed leak, first plug the leak. Then rake out the leaking molecular sieve and observe its colour. If the leaking molecular sieve is black and yellow in colour and can be crushed by hand it should be thrown away decisively. If the colour of the leaking molecular sieve has not changed significantly and there is no obvious differentiation, it can be filled in the upper part of the purifier. Also purchase molecular sieves as a matter of urgency. Prepare the back-up system fluid by opening the upper manhole of the purifier and find a large pit near the edge of the purifier. The lower manhole of the purifier was then opened and the screen was found to have leaked all the way to the edge. After checking the oxygen content in the purifier, the leak was viewed. The leak was found to be at the edge of the screen and the purifier, and the crimp of the purifier was not well pressed. This resulted in a large leak of molecular sieve, which occurred at the edge. The leaking portion was raked out. The molecular sieve was not found to be discoloured. The unpowdered molecular sieves were filled to the top and then the molecular sieves were added to the top of the purifier to rake the bed flat. All holes are then sealed.
Dear Air has an always experienced overhaul team to meet the 24 hour overhaul needs of our customers for their small air separation units, large air separation units and liquid air separation plants.
