Solution: Near Field Testing (NFT)
Solution: Near Field Testing (NFT)
Near Field Testing (NFT)
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NFT is a tube testing technique for inspection of finned ferromagnetic tubes where internal pitting corrosion and erosion are expected. NFT is an electromagnetic through transmission technique like RFT. With the advantage that it isn’t affected by baffle plates now the sensing coils are put in the near field of the transmitting coil of the probe.
TÜV AUSTRIA proposes in-situ examination according ASME standards. Approximately 250, 6-meter-long tubes can be inspected in one normal working day. As secondary technique, IRIS or endoscopy are mostly proposed. All data is saved, and a report is generated the same day. An alternative technique for inspection of finned ferromagnetic tubes is MFL. MFL is less accurate in flaw depth evaluation, but a little more sensitive.