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NB/T 47013.6-2015

Chinese Standard: 'NB/T 47013.6-2015'
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Standard ID NB/T 47013.6-2015 (NB/T47013.6-2015)
Description (Translated English) (Nondestructive testing of pressure equipments - Part 6: Eddy Current Testing)
Sector / Industry Energy Industry Standard (Recommended)
Classification of Chinese Standard H26
Date of Issue 2015-04-02
Date of Implementation 2015-09-01
Older Standard (superseded by this standard) JB/T 4730.6-2005
Regulation (derived from) ?Energy Bureau Announcement 2015 No. 3

ICS 77.040.20
H 26
Replacing JB/T 4730.6-2005
Nondestructive Testing of Pressure
Equipments -
Part 6. Eddy Current Testing
第 6部分. 涡流检测
Issued by. National Energy Administration of the People's Republic of
Foreword ... I
1 Scope ... 1
2 Normative References ... 1
3 Terminologies and Definitions ... 2
4 General Requirements ... 2
5 Eddy Current Testing for Ferromagnetic Tubular Products ... 5
6 Eddy Current Testing for Non-ferromagnetic Metal Tubular Products ... 10
7 Far Field Eddy Current Testing for Ferromagnetic Heat Exchange Tube In-Service ... 16
8 Eddy Current Testing for Non-Ferromagnetic Heat Exchange Tube In-Service ... 21
9 Eddy Current Testing for the Parts of Probe coil ... 27
10 Eddy Current Testing for Welds with Probe Coil ... 31
11 Measurement of Cover Layer Thickness ... 39
12 Evaluation of Testing Results ... 43
13 Testing Record and Report ... 43
Appendix A (Normative) Reference Sample for Eddy Current Testing over Flaw
Characteristics of Ferromagnetic Tubes for Pressure Equipments In-service ... 45
Appendix B (Normative) Type III Reference Sample for Eddy Current Testing over
Non-ferromagnetic Tubes for Pressure Equipments In-service ... 46
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.
This Part was proposed by and is under the jurisdiction of National Technical Committee
on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).
Drafting organizations of this Part. Hefei General Machinery Research Institute, China
Special Equipment Inspection and Research Institute, Beijing Institute of Aeronautical
Materials, North China Electric Power Research Institute, Eddysun (Xiamen) Electronic Co.,
Ltd. and Zhejiang Provincial Special Equipment Inspection and Research Institute.
Chief drafters of this Part. Guan Weihe, Shen Gongtian, Xu Kebei, Hu Xianlong, Lin
Junming, Cheng Huayun, Hu Bin and Liu Fujun.
The previous editions of the standards superseded by this Part are as follows.
- JB 4730-1994 and JB/T 4730.6-2005.
Nondestructive Testing of Pressure Equipments -
Part 6. Eddy Current Testing
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
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
GB/T 12969.2 Method of Eddy Current Inspection for Titanium and Titanium Alloy
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
NB/T 47013.3 Nondestructive Testing of Pressure Equipments - Part 3. Ultrasonic
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
continuously on whole or local part of the tested workpiece. Provided the tested workpiece is
not permitted to preserve residual magnetism, the magnetizing apparatus shall be also
employed with demagnetizing apparatus.
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.
4.3 Reference sample
4.3.1 The reference sample is mainly used to adjust the testing sensitivity and testing
parameters of eddy current testing instrument, to determine the acceptance level and to ensure
the accuracy of testing results.
4.3.2 The reference sample shall have the specification, designation, heat treatment
condition, surface condition and electromagnetic property same or similar to those of the
tested workpiece.
4.3.3 The reference sample surface shall be free from foreign matters and the flaws
influencing the calibration.
4.3.4 The artificial flaw processed on reference sample shall be measured by proper method,
and shall meet the requirements of relevant standard or technical specification.
4.3.5 The size of artificial flaw on reference sample shall not be interpreted as the smallest
detectable flaw size of testing equipment.
4.4 Tested workpiece
4.4.1 The surface of tested workpiece shall be clean, no burrs, and free from powder dust
and other contaminants, especially the ferromagnetic particle, that may influence the normal
application of eddy current testing; otherwise, all of foreign materials shall be perfectly
removed, and the surface of tested workpiece shall not be damaged in the removing process.
4.4.2 The parameters of the tested workpiece such as surface roughness shall meet the
requirements of relevant product technical specification.
4.5 Testing environment
4.5.1 The testing process shall comply with the relevant national and local laws, especially
the laws and regulations in relation to accident prevention, electric safety, high-risk industry
and environmental protection, and the standard users are liable to obey the laws and
regulations relevant to safety.
4.5.2 The temperature and relative humidity at the testing site shall controlled within the
allowable range of instrument, equipment and the tested workpiece.
4.5.3 The place nearby testing site shall have no magnetic field, vibration, corrosive gas and
other interferences that may influence the normal operation of instrument and equipment.
some other characteristics of tested workpiece will influence the testing results.
4.7.1 The inside diameter (outside diameter) of test coil shall match the...
Related standard: NB/T 47013.14-2016    NB/T 47013.10-2015