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Low frequency electromagnetic testing method for pressure equipment
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Basic data
| Standard ID | GB/T 44845-2024 (GB/T44845-2024) |
| Description (Translated English) | Low frequency electromagnetic testing method for pressure equipment |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H26 |
| Classification of International Standard | 77.040.20 |
| Word Count Estimation | 22,249 |
| Date of Issue | 2024-10-26 |
| Date of Implementation | 2024-10-26 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44845-2024: Low frequency electromagnetic testing method for pressure equipment
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Low frequency electromagnetic testing method for pressure equipments
Low frequency electromagnetic detection method for pressure equipment
ICS 77.040.20
CCS H 26
National Standard of the People's Republic of China
Released on 2024-10-26
Implementation on 2024-10-26
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface ... Ⅲ
1 Scope ... 1
2 Normative references ... 1
3 Terms and Definitions ... 1
4 Method Overview ... 1
5 Personnel Qualifications ... 2
6 Low frequency electromagnetic detection instruments ... 2
7 Low frequency electromagnetic testing procedures ... 7
8 Evaluation and processing of test results 9
9 Test Records and Reports 10
Appendix A (Informative) Example of test area division and numbering ... 11
Appendix B (Informative) Test Records and Reports ... 13
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Technical Committee for Standardization of Boilers and Pressure Vessels (SAC/TC 262).
This document was drafted by. China Special Equipment Testing and Research Institute, Beijing University of Technology, Chongqing Special Equipment Testing and Research Institute, Nanjing
Boiler and Pressure Vessel Inspection Institute, Chengdu Special Equipment Inspection and Testing Institute, Yunnan Special Equipment Safety Inspection Institute, Guizhou Province
Special Equipment Inspection and Testing Institute, Guangdong Special Equipment Inspection and Research Institute Maoming Inspection Institute, Suzhou Thermal Engineering Research Institute Co., Ltd., Jiangxi Provincial Inspection
Special Equipment Inspection and Testing Institute of the General Institute of Testing and Certification.
The main drafters of this document are. Li Guanghai, Lu Xinyuan, Jiao Jingpin, Shao Shanshan, Chen Jie, Zhang Binbin, Peng Gang, Yuan Kun, Luo Xiong, Shi Fangjie,
Shen Shuqian, Yu Yongliang, Zhao Jingyong, Zhao Peng, Nie Yin, Zhang Wei, Tang Xinwen, Guo Jingqian, and Zhang Qi.
Low frequency electromagnetic detection method for pressure equipment
1 Scope
This document specifies the requirements for testing instruments, testing procedures and result evaluation methods for low-frequency electromagnetic testing of pressure-bearing equipment.
This document is applicable to low-frequency electromagnetic inspection of surface and buried defects of pressure-bearing equipment made of conductive metal materials with a wall thickness of 2 mm to 20 mm.
The maximum lift-off height including coating thickness during testing shall not exceed 3 mm.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies.
in this document.
GB/T 5616 Nondestructive Testing Application Guidelines
GB/T 12604.6 Nondestructive testing terminology Eddy current testing
NB/T 47013 (all parts) Nondestructive testing of pressure equipment
3 Terms and definitions
The terms and definitions defined in NB/T 47013.1, GB/T 12604.6 and the following apply to this document.
3.1
low frequency electromagnetic excitation frequency low frequency electromagnetic excitation frequency
Nominal frequency of low frequency electromagnetic field excitation current.
3.2
low frequency electromagnetic field
The eddy current generated on the surface and inside of the object being tested is excited by low-frequency AC current with an excitation frequency generally not higher than 300 Hz.
The coupling field of the leakage magnetic field.
3.3
Defect equivalent
The defect value is given according to the obtained signal characteristics.
3.4
Orthogonal scan
Scanning in directions perpendicular to each other.
4 Method Overview
4.1 The basic principle of low-frequency electromagnetic detection method is shown in Figure 1.The coil with low-frequency alternating current excites low-frequency electromagnetic radiation on the surface and inside of the object being detected.
The low-frequency electromagnetic field will be distorted at the defect. The detection element picks up the signal change of the low-frequency electromagnetic field and performs
Analyze and process to realize the detection of surface, near-surface and buried defects of the inspected object.
...
