NB/T 47013.6-2015Nondestructive Testing of Pressure Equipments - Part 6: Eddy Current Testing (English PDF)

Foreword

This Standard "Nondestructive Testing of Pressure Equipments" (NB/T 47013) comprises the following 13 parts.

- Part 1. General Requirements;

- Part 2. Radiographic Testing;

- Part 3. Ultrasonic Testing;

- Part 4. Magnetic Particle Testing;

- Part 5. Penetrant Testing;

- Part 6. Eddy Current Testing;

- Part 7. Visual Testing;

- Part 8. Leak Testing;

- Part 9. Acoustic Emission Testing;

- Part 10. Ultrasonic Time of Flight Diffraction Technique;

- Part 11. Standard Practice for X-ray Digital Radioscopy;

- Part 12. Magnetic Flux Leakage Testing;

- Part 13. Pulsed Eddy Current Testing.

This Part is Part 6 of NB/T 47013. Eddy Current Testing.

This Part was drafted according to the rules given in "Directives for Standardization - Part 1. Structure and Drafting of Standards" (GB/T 1.1-2009).

This Part supersedes "Nondestructive Testing of Pressure Equipments - Part 6. Eddy Current Testing" (JB/T 4730.6-2005); compared with JB/T 4730.6-2005, this Part has the following main technical changes.

- the content of eddy current testing for spare parts of probe coil was added;

- the content of eddy current testing for weld of probe coil was added;

- the content of measurement of cover layer thickness was added;

- the testing content of eddy current thickness measurement was added;

- the scope of eddy current testing was extended.

1 Scope

1.1 This Part of NB/T 47013 specifies the requirements for the eddy current testing methods and quality classification of pressure equipments.

1.2 This Part is applicable to the eddy current testing for the surface and near surface flaws of metallic tubular products, spare parts and welded joints having electric conductivity used for the pressure equipments in-fabrication and in-service, and is also applicable to the measurement of surface cover layer thickness of metallic substrate with magnetic method and eddy current method. 1.3 The eddy current testing for the supporting members and structural members relevant to pressure equipments may also be made reference to this Part.

2 Normative References

The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 5126 Eddy Current Inspection Method for Cold Drawn Thin Wall Tubes of Aluminum and Aluminum Alloy

GB/T 5248 Copper and Copper Alloy - Seamless Tubes - Eddy Current Testing Method

GB/T 7735 Steel Tubes - The Inspection Method on Eddy Current Test

GB/T 12604.6 Non-destructive Testing - Terminology - Terms Used in Eddy Current Testing

GB/T 12969.2 Method of Eddy Current Inspection for Titanium and Titanium Alloy Tubes

GB/T 14480.3 Non-destructive Testing - Equipment for Eddy Current Examination - Part 3. System Characteristics and Verification

NB/T 47013.1 Nondestructive Testing of Pressure Equipments - Part 1. General Requirements

NB/T 47013.3 Nondestructive Testing of Pressure Equipments - Part 3. Ultrasonic Testing

NB/T 47013.4 Nondestructive Testing of Pressure Equipments - Part 4. Magnetic Particle Testing

NB/T 47013.5 Nondestructive Testing of Pressure Equipments - Part 5. Penetrant Testing continuously on whole or local part of the tested workpiece

4 General Requirements

4.2.11 The mechanical transmission mechanism shall ensure the stable relative motion between the tested workpiece and the test coil with specified pattern, and shall not cause any damage to the surface of the tested workpiece.

4.2.12 The recording device shall be able to promptly and correctly record the output signal of testing instrument.

4.2.13 In the following cases, the sensitivity of eddy current testing equipment shall be inspected and reinspected with reference sample.

a) Prior to testing and after testing every time;

b) Suspicion of abnormal state about testing equipment;

c) Change of the specification of tested object;

d) In continuous testing, the inspection and reinspection are conducted once per 2h;

e) Dispute between both contractors, or the inspection regarded as necessary. […]