ISO 20669:2017 PDF

Non-destructive testing — Pulsed eddy current testing of ferromagnetic metallic components

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Title (English):

ISO 20669:2017

Non-destructive testing — Pulsed eddy current testing of ferromagnetic metallic components

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 13
Publication date:: March 13, 2017
Edition:: ISO IS 20669 edition 1 version 1
ICS:: 19.100

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Description (English):

ISO 20669:2017 specifies the pulsed eddy current (PEC) testing technique used to perform thickness measurement on ferromagnetic metallic components with or without the presence of coating, insulation and weather sheeting. ISO 20669:2017 applies to the testing of in-service components made of carbon steel and low-alloy steel in the temperature of −100 °C to 500 °C (temperature measured at metal surface). The range of wall thickness of components is from 3 mm to 65 mm and the range of thickness of coatings is from 0 mm to 200 mm. The tested components also include piping of diameter not less than 50 mm. The technique described in this document is sensitive to the geometry of the component and applying the technique to components outside of its scope will result in unpredictable inaccuracy. This document does not apply to the testing of crack defects and local metal loss caused by pitting. ISO 20669:2017 does not establish evaluation criteria. The evaluation criteria shall be specified by the contractual agreement between parties.

Technical details

Technical committee: ISO/TC 135/SC 4 - Eddy current testing
SKU: ISO 20669:2017

Abstract

Overview

ISO 20669:2017 - "Non-destructive testing - Pulsed eddy current testing of ferromagnetic metallic components" specifies the pulsed eddy current (PEC) testing technique for non-destructive thickness measurement of ferromagnetic metals. It covers in-service carbon steel and low-alloy steel components (including piping ≥ 50 mm diameter) across temperatures from −100 °C to 500 °C, wall thicknesses 3 mm to 65 mm, and coating thicknesses 0 mm to 200 mm. The standard defines principles, equipment, on-site procedures, influence factors and documentation, but does not set acceptance/evaluation criteria (these must be agreed contractually). It also excludes detection of cracks and local pitting.

Key Topics

Principles of PEC testing: generation of pulsed electromagnetic fields, transmit/receive probe design, and analysis of decay curves (e.g., characteristic time, bending point, decay slope).
Measurement ranges & limits: applicable metal/coating thickness and temperature ranges; sensitivity to component geometry - applying PEC outside scope may produce unpredictable inaccuracies.
Equipment & probes: requirements for PEC instruments that generate pulses and separate transmit–receive probes; sensitivity adjustment and verification procedures.
Influence factors: coating/insulation properties (conductivity, permeability, thickness), component material variability, temperature effects, probe selection, reference zone choice, vibration, and geometry.
On-site testing procedures: documentation, site investigation, surface preparation, reference selection and recording, test execution, safety and result verification.
Personnel & quality: qualification of operators, maintenance and verification of equipment, and mandatory documentation (test procedures, records, reports).
Limitations: not suitable for crack detection or pitting evaluation; geometry knowledge required for reliable setup.

Applications

ISO 20669:2017 is designed for practical use where access or coating removal is difficult:

Inspection of insulated or coated pipelines and pressure equipment in petrochemical, oil & gas, power generation and industrial plants.
In-service thickness monitoring during operation (no coupling medium required).
Situations requiring rapid screening of wall thickness through insulation or weather sheeting. Who uses it: NDT technicians and inspectors, asset owners/operators, integrity engineers, inspection service providers, and PEC equipment manufacturers developing procedures and calibration references.

Related Standards

ISO 15548-3 (Eddy current equipment characteristics & verification)
ISO 16809 (Ultrasonic thickness measurement)
ISO 12718 (Terminology for pulsed eddy currents) These referenced standards support equipment verification, complementary thickness methods, and consistent terminology for PEC-based NDT.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics

Principles of PEC testing: generation of pulsed electromagnetic fields, transmit/receive probe design, and analysis of decay curves (e.g., characteristic time, bending point, decay slope).
Measurement ranges & limits: applicable metal/coating thickness and temperature ranges; sensitivity to component geometry - applying PEC outside scope may produce unpredictable inaccuracies.
Equipment & probes: requirements for PEC instruments that generate pulses and separate transmit–receive probes; sensitivity adjustment and verification procedures.
Influence factors: coating/insulation properties (conductivity, permeability, thickness), component material variability, temperature effects, probe selection, reference zone choice, vibration, and geometry.
On-site testing procedures: documentation, site investigation, surface preparation, reference selection and recording, test execution, safety and result verification.
Personnel & quality: qualification of operators, maintenance and verification of equipment, and mandatory documentation (test procedures, records, reports).
Limitations: not suitable for crack detection or pitting evaluation; geometry knowledge required for reliable setup.

Applications

ISO 20669:2017 is designed for practical use where access or coating removal is difficult:

Inspection of insulated or coated pipelines and pressure equipment in petrochemical, oil & gas, power generation and industrial plants.
In-service thickness monitoring during operation (no coupling medium required).
Situations requiring rapid screening of wall thickness through insulation or weather sheeting. Who uses it: NDT technicians and inspectors, asset owners/operators, integrity engineers, inspection service providers, and PEC equipment manufacturers developing procedures and calibration references.

Related Standards

ISO 15548-3 (Eddy current equipment characteristics & verification)
ISO 16809 (Ultrasonic thickness measurement)
ISO 12718 (Terminology for pulsed eddy currents) These referenced standards support equipment verification, complementary thickness methods, and consistent terminology for PEC-based NDT.

ISO 20669:2017 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Non-destructive testing. Equipment for eddy current examination. System characteristics and verification.

Non-destructive testing. Ultrasonic thickness determination.

Non-destructive testing. Eddy current testing. Vocabulary.