Pulsed Eddy Current (PEC)
Typical application
PEC is commonly applied for:
• Corrosion Under Insulation (CUI) screening
• Tank floor inspections
• Pipe inspections through coatings
• Fireproofed structures
• Large-area corrosion screening
PEC is often used to prioritise follow-up inspections.
Suitable inspection scenarios
PEC is suitable when:
• Direct surface access is limited
• Coatings or insulation cannot be removed
• Large areas need to be screened efficiently
• Relative wall loss trends are sufficient
• In-service conditions apply
PEC supports condition screening, not detailed characterisation.
Not suitable / limitations
PEC is not suitable for:
• Precise remaining wall thickness determination
• Localised pitting characterisation
• Non-conductive materials
• Complex geometries with variable lift-off
Limitations include:
• Lower spatial resolution compared to UT
• Results influenced by probe lift-off
• Interpretation requires experience
• Typically requires validation by follow-up NDT
Safety considerations
PEC is suitable when:
• Direct surface access is limited
• Coatings or insulation cannot be removed
• Large areas need to be screened efficiently
• Relative wall loss trends are sufficient
• In-service conditions apply
PEC supports condition screening, not detailed characterisation.
Description
Pulsed Eddy Current (PEC) is an electromagnetic inspection technique used to assess wall thickness and corrosion in conductive materials without direct surface contact. The method is particularly suited for inspections through coatings, insulation or fireproofing. PEC provides relative wall loss information rather than precise point measurements.
Pros
Pros Cons
ConsAdvantages in the right context:
• Inspection through insulation and coatings
• Rapid large-area screening
• Suitable for in-service assets
• Reduced surface preparation
• Minimal operational impact
Limitations to consider:
• Limited accuracy compared to UT
• Relative measurements only
• Not suitable for acceptance decisions
• Follow-up inspection usually required
• Data interpretation complexity
Disclaimer
Information on this page is indicative and context-dependent.
PEC does not replace applicable codes, standards or engineering judgement.
Inspection planning and acceptance decisions remain the responsibility of the asset owner and inspection professional.