Internal Oxide Scale Measurement is a specialised inspection service used to evaluate oxide scale formation on the internal surfaces of high-temperature components such as boiler tubes and piping. Oxide scale buildup acts as a thermal barrier, increasing metal temperature and accelerating creep and overheating damage.
Accurate measurement of oxide scale thickness is essential for assessing remaining life and preventing high-temperature failures.
Why Internal Oxide Scale Measurement Is Required
Oxide scale growth occurs progressively during high-temperature operation and is not visible from the external surface. Excessive scale thickness reduces heat transfer efficiency, raises tube metal temperature, and significantly shortens component life.
Internal oxide scale measurement enables early identification of overheating risk and supports proactive maintenance and replacement planning.
Scope of Inspection
Internal oxide scale measurement is applicable to:
Boiler water wall, superheater, and reheater tubesHigh-temperature piping and headersHeat recovery steam generatorsFurnace and heater tubesCarbon steel and alloy steel components
Inspection Methodology
Internal oxide scale measurement is performed using specialised ultrasonic techniques that differentiate between metal wall thickness and oxide layer thickness. Inspection planning considers material grade, operating temperature, service duration, and known overheating history.
Ultrasonic signals are analysed to determine oxide scale thickness and distribution along the component length. The measured data is correlated with operating conditions to estimate metal temperature exposure and assess remaining creep life. Results are interpreted by integrity specialists to support life assessment and inspection interval optimisation.
Key Benefits
This service provides accurate assessment of oxide scale buildup, helps identify overheating risk, supports remaining life evaluation, and improves reliability of high-temperature components.
Industries and Applications
Internal oxide scale measurement is widely applied in thermal power plants, captive power units, refineries, petrochemical plants, fertilizer complexes, and other high-temperature process industries.
Internal Oxide Scale Measurement offers critical insight into hidden degradation in high-temperature components. By quantifying oxide buildup and associated overheating risk, this service supports safe operation, life extension planning, and failure prevention.
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