Near Field Testing (NFT)
Method Overview
High-speed electromagnetic testing method for detecting internal corrosion and pitting in carbon steel fin-fan tubes.
Core Method Specifications
Target Applications & Governing Standards
1 Scopes ConfiguredMethod Limitations & Operational Boundary Conditions
Critical physics limits, thermal envelopes, blind spots, and ASME Sec V / API procedural boundaries for NFT.
Standard electromagnetic coil drift compensation apply.
Optimized strictly for inner-diameter (ID) surface and near-surface defect detection
None
Transmitter and receiver coils positioned close together: detects localized internal pitting and erosion
- •External (OD) flaws: Completely blind to outer-diameter corrosion, erosion, and external baffle fretting
- •Flaws located beneath the tube sheet expansion roll joint
Variations in probe pull speed affecting signal amplitude on analogue displays
Combine with Remote Field Testing to inspect the outer diameter (OD) and support baffle wear
Internal video borescope inspection to visually verify pit depth
Technique-to-OEM Compatibility Matrix
Verified manufacturers, instrument models, and diagnostic portals supporting NFT.
Eddyfi Technologies
Advanced non-destructive testing conglomerate encompassing Eddyfi electromagnetic arrays, Silverwing tank floor scanners, Teletest guided waves, Inuktun robotic crawlers, and M2M phased array instruments.
Zetec
Advanced eddy current and ultrasonic NDT technology subsidiary of Eddyfi/Roper for nuclear power generation, aerospace, and balance-of-plant tube inspections.
Russell NDE Systems
Canadian pioneer of Remote Field Electromagnetic Technique (RFET) and Near Field Testing (NFT) instrumentation and in-line crawlers for boiler and condenser tubes.
Russell NDE
OEM Manufacturer for NFT inspection systems.