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GB/T 38882-2020: Non-destructive testing - Testing method for wall-thickness loss of ferromagnetic tubes using magnetic flux leakage
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| GB/T 38882-2020 | English | 339 |
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Non-destructive testing - Testing method for wall-thickness loss of ferromagnetic tubes using magnetic flux leakage
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GB/T 38882-2020
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Basic data | Standard ID | GB/T 38882-2020 (GB/T38882-2020) | | Description (Translated English) | Non-destructive testing - Testing method for wall-thickness loss of ferromagnetic tubes using magnetic flux leakage | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 18,132 | | Date of Issue | 2020-06-02 | | Date of Implementation | 2020-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 38882-2020: Non-destructive testing - Testing method for wall-thickness loss of ferromagnetic tubes using magnetic flux leakage
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Non-destructive testing - Testing method for wall-thickness loss of ferromagnetic tubes using magnetic flux leakage
ICS 19.100
J04
National Standards of People's Republic of China
Non-destructive testing of magnetic flux leakage of ferromagnetic pipe fittings
Detection method
2020-06-02 release
2020-12-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Method summary 1
5 Safety requirements 2
6 Personnel requirements 3
7 Testing procedure 3
8 Testing system and equipment 3
9 Test Procedure 5
10 Evaluation and processing of test results 8
11 Test records and reports 8
Appendix A (Normative Appendix) Calibration Sample and Comparative Sample 9
Reference 12
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed and managed by the National Non-destructive Testing Standardization Technical Committee (SAC/TC56).
This standard was drafted by. Hefei Zhongda Testing Technology Co., Ltd., China Special Equipment Testing Research Institute, Shanghai Materials Research Institute, Valu Rui
Ketianda (Anhui) Co., Ltd.
The main drafters of this standard. He Shengbing, Ding Keqin, Chen Bin, Ding Jie, He Jian, Zhang Chunxiang, Bi Tianhui, Zhang Yifeng, Ma Jun.
Non-destructive testing of magnetic flux leakage of ferromagnetic pipe fittings
Detection method
1 Scope
This standard stipulates the method of using external magnetization to detect the magnetic flux leakage of the ferromagnetic pipe wall thickness loss.
This standard applies to the manufacture, processing and manufacture of ferromagnetic pipe fittings with an outer diameter of not less than 10 mm and a wall thickness of not more than 20 mm (except welded pipes)
On-line detection of wall thickness loss of pipe fittings during the repair process. This standard also applies to the automatic loss of wall thickness of petroleum pipes and end-thickened steel pipes
Detection.
2 Normative references
The following documents are essential for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 9445 Qualification and certification of non-destructive testing personnel
GB/T 12604.5 Non-destructive testing term magnetic particle testing
GB/T 12604.6 Non-destructive testing term eddy current testing
GB/T 34357 Non-destructive testing term magnetic flux leakage test
3 Terms and definitions
The terms and definitions defined in GB/T 12604.5, GB/T 12604.6 and GB/T 34357 apply to this document.
4 Method summary
4.1 Detection principle
The principle of the magnetic flux leakage detection of the wall thickness loss of the pipe is shown in Figure 1.The position of the wall thickness loss is detected by the magnetization of the external DC magnetic field.
As the magnetic resistance increases, the magnetic field lines will be distorted accordingly, and some of the magnetic field lines will leak into the external space of the pipe to form a leakage magnetic field. Due to the leakage magnetic field and wall thickness
The depth of the loss is related to the size, so the wall thickness loss magnetic flux leakage detection system passes the wall thickness detection probe (Hall element, tunnel is usually used inside
(Magnetoresistive element, giant magnetoresistive element and other magnetic field sensors) and the relative movement of the tube to be detected, the leakage magnetic field signal is detected, after signal processing and data
After the analysis, the graph curve of the pipe wall thickness detection is formed.
The magnetic flux leakage detection system for wall thickness loss compares the signal obtained by the tested pipe fitting with the comparison sample to detect the pipe fitting with excessive wall thickness loss.
The pipe fitting triggers an alarm and makes a mark.
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