GB/T 38882-2020Non-destructive testing—Testing method for wall-thickness loss of ferromagnetic tubes using magnetic flux leakage (English PDF)
无损检测 铁磁性管件壁厚变化漏磁检测方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 2, 2020
Implementation date
January 1, 2021
Scope
GB/T 38882-2020 is the English-translated version of 无损检测 铁磁性管件壁厚变化漏磁检测方法.
GB/T 38882-2020 is the Chinese standard "Non-destructive testing—Testing method for wall-thickness loss of ferromagnetic tubes using magnetic flux leakage". Its scope clause reads: 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. Its clauses include terms and definitions; method summary.
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Document preview — GB/T 38882-2020
National Standard of the People's Republic of China
- ICS
- 19.100
- Classification
- J 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Method summary
- 5 Safety requirements
- 6 Personnel requirements
- 7 Testing procedure
- 8 Testing system and equipment
- 9 Test Procedure
- 10 Evaluation and processing of test results
- 11 Test records and reports
- Appendix A (Normative Appendix) Calibration Sample and Comparative Sample
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.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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