QIS has found that Magnetic Flux Leakage (MFL) is the best suited technique for early damage detection in the fin fan tubes. It can find corrosion at an early stage when the pit depth is only 20% of the tube wall, regardless of heavy deposits in the tubes. As for tube end grooving, even if the it is located as close to a half inch from the tube end, there is no better and faster technique. The aluminum fins don’t pose any problem as they are non-magnetic and don’t influence an MFL reading.
If you would like to speak with a QIS representative, call the Corporate Office at 877-747-4633 or (716) 853-2611, or click here to contact the office nearest you.
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MFL 
