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NB/T 47013.12-2015 (NB/T47013.12-2015)

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NB/T 47013.12-2015
ICS 77.040.20
H 26
Nondestructive Testing of Pressure Equipment
– Part 12. Magnetic Flux Leakage Testing
Issued by. National Energy Board
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 General Requirements ... 6
5 Magnetic Flux Leakage Testing of Copper Components under Production
... 10
6 Magnetic Flux Leakage External Testing of Pressure Equipment in the Use
... 10
7 Magnetic Flux Leakage Internal Testing of Pressure Pipe in the Use ... 14
8 Testing Record and Report ... 20
Appendix A (Normative) Magnetic Flux Leakage External Testing Specimen
of Pressure Equipment in the Use ... 22
Appendix B (Normative) Comparative Specimen of Magnetic Flux Leakage
Internal Testing on Pipe in the Use ... 27
This Standard NB/T 47013 Nondestructive Testing of Pressure Equipment can be
divided into 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 Examination;
--- 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 Radiography;
--- Part 12. Magnetic Flux Leakage Testing;
--- Part 13. Pulsed Eddy Current Testing.
This Part belongs to Part 12 of NB/T 47013. Magnetic Flux Leakage Testing.
This Part was drafted as per the rules specified in GB/T 1.1-2009 Directives for
Standardization – Part 1. Structure and Drafting of Standards.
This Part was proposed and under the jurisdiction of National Technical Committee for
Standardization of Boilers and Pressure Vessels (SAC/TC 262).
Drafting organizations of this Part. China Special Equipment Inspection and Research
Institute, China Special Inspection Technology Development (Beijing) Co., Ltd.,
Huazhong University of Science and Technology, Shenyang University of Technology,
Beijing Crahesion Science & Trade Co., Ltd., Eddysun (Xiamen) Electronic Co., Ltd.,
Northeast Petroleum University, Sinopec Tianjin Branch Equipment Research Institute,
Changchun Special Equipment Inspection and Research Institute, Zhejiang Special
Equipment Inspection and Research Institute, Nanjing Boiler & Pressure Vessel
Supervisions and Inspection Institute, Shandong Ruixiang Mold Co., Ltd., Anhui
Nondestructive Testing of Pressure Equipment
– Part 12. Magnetic Flux Leakage Testing
1 Scope
1.1 This Part of NB/T 47013 specifies the magnetic flux leakage testing and result
evaluation method for pressure equipment made of ferromagnetic materials, seamless
steels pipe and welded pipe (excluding submerged arc welding).
1.2 This Part is applicable to the magnetic flux leakage testing for corrosion, existing
mechanical damage, and other volume defects generated on the pressure equipment
made of ferromagnetic materials with or without coatings, and on the internal and
external surface of the element base metal; the thickness of tested workpiece is no
greater than 30mm, pipe diameter is no less than 9mm.
1.3 The crack testing of pressure equipment and magnetic flux leakage testing of
atmospheric pressure storage tank.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 12604.5 Nondestructive Testing – Terminology – Terms Used in Magnetic
Particle Testing
GB/T 12604.6 Nondestructive Testing – Terminology – Terms Used in Eddy
Current Testing
GB/T 12606 Steel Tubes- The Testing Method of Magnetic Flux Leakage
GB/T 20737 Nondestructive Testing – General Terms and Definitions
GB/T 27699 Steel Pipeline In-Line Inspection Technical Specification
NB/T 47013.1 Nondestructive Testing of Pressure Equipment – Part 1. General
NB/T 47013.3 Nondestructive Testing of Pressure Equipment – Part 3. Ultrasonic
3 Terms and Definitions
The following terms and definitions and those ones stipulated in GB/T 12604.5, GB/T
12604.6, GB/T 20737 and NB/T 47013.1 are applicable to this Part.
3.1 Defect equivalent
The quantity equivalent to the specific or conventional numerical value. In this Part, it
indicates the quantity value of defects given by the obtained signal characteristics.
3.2 Defect sizing
The description of geometric dimension of defects given by the obtained signal
4 General Requirements
4.1 Testing staff
The staff performing the magnetic flux leakage testing shall obtain the corresponding
qualification certificate according to the provisions of NB/T 47013.1; meanwhile they
shall possess basic knowledge of electromagnetism; then they can carry out the testing
work specified by corresponding qualification level.
4.2 Equipment and material
4.2.1 Magnetic flux leakage testing system The magnetic flux leakage testing system shall include at least power supply,
magnetization device, magnetic field sensor, scanning device, signal acquisition unit,
signal displaying (or alarming) unit, signal storage unit, etc.; if necessary, also include
demagnetization device, and position recording device. The magnetic flux leakage testing system shall have the functions of funding
defect position, and performing deep analysis and display.
4.2.2 Specimen Calibration Specimen The calibration specimen mainly aims to test the individual channel
functions of magnetic flux leakage tester, adjust the testing sensitivity, adjust testing
parameters and ensure the accuracy of testing results. The calibration specimen shall be made of the same materials with the
tested object or materials with similar electromagnetic properties.
e) Probe. number of probes, probe model and layout;
f) System verification;
g) Specimen calibration.
4.3.6 The magnetic flux leakage testing of each pressure equipment shall be
complied operating instructions according to the testing process specification; if the
equipment with the same specifications is in the same working conditions, then one
operating instructions can be shared.
4.3.7 When the operating instructions are used first-time, it shall be verified; the
verification mode can adopt the comparative specimen and actually-testing object.
4.4 Testing environment
4.4.1 The testing procedures shall abide by the relevant national and local laws,
especially the laws and regulations involved accident prevention, electrical safety,
high-risk industries and environmental protection.
4.4.2 The testing environment shall meet the requirements of instrument and
equipment, and tested workpiece.
4.4.3 There shall be no electromagnetic interference source near the testing site to
influence the normal working of instrument and equipment.
4.5 Safety requirements
4.5.1 This Part fails to list all safety requirement during the testing period; the users
who use this Part is obliged to establish appropriate safety and health guidelines prior
to testing.
4.5.2 During the process of transporting, storing, and handling magnetization device,
take appropriate measures to avoid the influence of high intensity magnetic separation
on the personal safety, equipment, instrument and environment.
4.5.3 The basic safety requirements during the testing period are as follows.
a) The testing staff shall abide by the safety requirements on the working site to
wear protective clothing and wear protective equipment;
b) During testing period, pay attention to avoid the personal injuries and equipment
damage caused by the magnetic field suction;
c) During testing period, pay attention to the influence of magnetic field against other
auxiliary electronic equipment.
than 6mm, the artificial defects with 20% depth thickness on the tested object surface
can be defected; for the wall thickness greater than 8mm or containing thickness
greater than 6mm, its testing sensitivity shall be determined through the negotiation
between the user and the testing organization.
6.2.6 Signal display
The indicator light and screen shall be adopted to display the position, depth equivalent
or other information of the defects.
6.2.7 System calibration
Perform the system calibration once per year through the calibration specimen. The
calibration is realized through test the artificial defects by the testing system on the
calibration specimen
6.2.8 System function verification
The equipment system function shall be verified by the calibratio...
(Above excerpt was released on 2017-06-08, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/NBT47013.12-2015