Overview - ISO 10893-2:2011 (Automated eddy current testing)
ISO 10893-2:2011 is an international standard that specifies requirements for automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes to detect imperfections. It applies to tubes with an outside diameter ≥ 4 mm and can also be applied to hollow sections. The standard covers test techniques, equipment, calibration with reference tubes, operator qualifications and acceptance/reporting requirements for routine production inspection.
Key topics and technical requirements
- Scope & timing: Inspection is normally performed after completion of production operations (rolling, heat treatment, forming, straightening, etc.). Tubes must be sufficiently straight with clean surfaces for valid testing.
- Test techniques: Recognized automated/semi-automated techniques include:
- Concentric coil (full peripheral) - limited to ø180 mm (ø250 mm for E4H).
- Fixed or rotating probe / pancake coil (full peripheral) - no maximum diameter restriction; primarily detects external surface-breaking defects.
- Segment coil - used for weld-seam inspection or full-body scanning (limits: ø219.1 mm for 2×180° coils, ø508.0 mm for 4×100° coils).
- Operating parameters: Relative speed during scanning shall not vary by more than ±10 %.
- Reference tubes & calibration: Calibration uses reference tubes or samples with drilled holes or notches. Reference tubes should match diameter, wall, surface finish and delivery condition of production tubes; specific reference arrangements are defined for each technique.
- Equipment features: Automated classification (acceptable/suspect), triggers/alarms and marking/sorting systems are required.
- Personnel: Operators must be qualified per ISO 9712, ISO 11484 or equivalent; NDT operations authorized by a Level 3 individual.
- Limitations: Annex A provides guidance on eddy current limitations (e.g., sensitivity decreases with depth; technique-specific limits).
Practical applications
- Inline quality control on tube production lines (seamless and welded, excluding SAW).
- Routine inspection of structural, mechanical and pressure-component tubes where detection of surface and near-surface imperfections is required.
- Pre-shipment acceptance testing and sorting of suspect lengths for repair or rejection.
- Integration into automated mills, testing stations and third-party NDT services.
Who uses ISO 10893-2:2011
- Tube manufacturers and mill quality managers
- NDT engineers and inspection service providers
- Procurement and specifications engineers specifying acceptance criteria
- Third-party inspectors and certification bodies involved in tube quality control
Related standards
- ISO 10893 series (Parts 1, 3–12) - related NDT methods for steel tubes (electromagnetic, ultrasonic, radiographic, penetrant, magnetic particle).
- ISO 9712 and ISO 11484 - personnel qualification and employer qualification systems for NDT.
Keywords: ISO 10893-2:2011, eddy current testing, non-destructive testing (NDT), steel tubes, automated eddy current, reference tube, coil techniques, tube inspection.
Open preview (PDF)Non-destructive testing of steel tubes — Part 2: Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of imperfections