BS ISO 20669:2017 pdf free
BS ISO 20669:2017 pdf free.Non-destructive testing – Pulsed eddy current testing of ferromagnetic metallic components
This document 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.
This document 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.
This document does not establish evaluation criteria. The evaluation criteria shall be specified by the contractual agreement between parties.
The following documents are referred to in text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 15548-3, Non-destructive testing 一Equipment for eddy current examination 一Part 3: System characteristics and vrification
ISO 16809, Non-destructive testing一Ultrasonic thickness measurement
For the purposes of this document, the terms and definitions given in ISO 12718 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
– IEC Electropedia: available at http://www.electropedia.org/
– ISO Online browsing platform: available at http://www.iso.org/obp
The nature of the coating can have an influence on the accuracy and sensitivity of the technique.
Coating/insulation parameters such as electrical conductivity, magnetic permeability, and thickness should be taken into account.
For a coating with ferromagnetic material, extra magnetization may be needed to saturate it for more accurate testing results. It is also important to reduce the vibration, often occurring with such cover, to improve the reliability of the test. Indeed, signals corrupted by too high vibration shall not be recorded.BS ISO 20669 pdf download.
