Olympus nortec 600 - Figure 5-220 the Readings for 40 % OD Loss (Left) and 60 % OD Loss (Right); Figure 5-221 a Finned Air-Cooler Tube (Fin-Fan); NFT Pitting (Differential)

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DMTA-10040-01EN, Rev. E, February 2018

Using the Instrument 279

Figure 5‑220 The readings for 40 % OD loss (left) and 60 % OD loss (right)

5.4.5 NFT Pitting (Differential) — NORTEC 600D Model

This near-field testing (NFT) application uses a differential configuration to detect

internal pitting in finned air-cooler tubing (also referred to as “fin-fan”) [see

Figure 5-221 on page 279].

Figure 5‑221 A finned air‑cooler tube (fin‑fan)

The near-field testing (NFT) eddy current technology is a rapid and inexpensive

inspection solution designed specifically for ID defect detection in carbon steel finned

tubes (see Figure 5-222 on page 280). NFT probes reduce inspection cost and improve

ease-of-use.

Olympus nortec 600 - Figure 5-220 the Readings for 40 % OD Loss (Left) and 60 % OD Loss (Right); Figure 5-221 a Finned Air-Cooler Tube (Fin-Fan); NFT Pitting (Differential) - NORTEC 600 D Model