We offer a full range of advanced Non-Destructive Testing (NDT) techniques for the inspection of heat exchanger, condenser, boiler, and air cooler tubes. These methods are designed to detect and quantify corrosion, pitting, erosion, fretting, and wall thinning—ensuring plant reliability and efficient maintenance planning.
IRIS uses ultrasonic immersion pulse-echo technology in combination with a rotating mirror probe to measure tube wall thickness from the inside.
• Suitable for detecting internal and external corrosion, pitting, and wall loss
• Minimum measurable wall thickness: ~0.5 mm
• Not suitable for crack detection
• Scope defined by client specifications or mutually agreed work scope
• Requires water flushing for coupling
Eddy Current Testing (ET) is used primarily for non-ferrous tubes (e.g., copper, brass, stainless steel). It uses bobbin coil probes to detect :
• Localized corrosion
• Pitting
• Wear and erosion
• Tube expansion defects
• Highly efficient for fast scanning of large tube bundles during shutdowns.
Remote Field Eddy Current Testing (RFET) is ideal for ferromagnetic tubes like carbon steel, where conventional eddy current is less effective.
• Uses a transmitter-receiver configuration spaced beyond 2x the tube diameter
• Detects wall loss, corrosion, and erosion by analyzing the phase shift and amplitude of signals
• Provides full through-wall inspection as the signal passes twice through the tube wall
• Excellent for in-service inspection of boiler and heat exchanger tubes.
Near Field Testing is an emerging NDT method used for inspecting carbon steel fin fan cooler tubes—particularly where Magnetic Flux Leakage (MFL) is not effective.
• Limited to ferromagnetic materials
• Uses a simple driver-pickup probe with differential and absolute signal channels
• Measures defect depth and size with good sensitivity
• Calibration on similar reference tubes is essential for accurate sizing
• A reliable solution for inspecting tight-radius or finned tubes.