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GB/T 35090-2018: Non-destructive testing -- Test method for weak magnetic testing of pipeline
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 35090-2018 | English | 239 |
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Non-destructive testing -- Test method for weak magnetic testing of pipeline
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GB/T 35090-2018
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Basic data | Standard ID | GB/T 35090-2018 (GB/T35090-2018) | | Description (Translated English) | Non-destructive testing -- Test method for weak magnetic testing of pipeline | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 12,122 | | Date of Issue | 2018-05-14 | | Date of Implementation | 2018-12-01 | | Regulation (derived from) | National Standards Announcement No. 6 of 2018 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 35090-2018: Non-destructive testing -- Test method for weak magnetic testing of pipeline---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.
(Nondestructive testing Pipeline weak magnetic detection method)
ICS 19.100
J04
National Standards of People's Republic of China
Non-destructive testing pipeline weak magnetic detection method
Published on.2018-05-14
2018-12-01 implementation
State market supervision and administration
China National Standardization Administration issued
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. General Engineering Research Institute of China Academy of Engineering Physics, Sichuan Ruidi Ray Imaging Technology Co., Ltd.,
Sea Materials Research Institute, China National Petroleum Corporation Pipeline Branch, Sinopec Long-distance Oil and Gas Pipeline Testing Co., Ltd., Beijing
Special Equipment Inspection Institute of Gas Group Co., Ltd., Beijing Zouzhan Yucheng Technology Co., Ltd., Xinjiang Gas Group, China National Petroleum
The seventh construction company Qingdao Weikang Zhongyou Testing Institute, Guizhou Gas Group Guizhou Anfa Engineering Testing Co., Ltd., Ningbo Yinzhou Magnetic Thai Electronics Branch
Technology Co., Ltd.
The main drafters of this standard. Hu Shaoquan, Niu Hongpan, Wei Liming, Cheng Fabin, Qianjin, Jin Yufei, Chen Pengchao, Han Wei, Liu Qingquan, Li Jianfeng,
Zhang Jianbing, Jing Wenxue, Bi Bo, Yu Runqiao.
Non-destructive testing pipeline weak magnetic detection method
1 Scope
This standard specifies a method of pipeline weak magnetic detection, which is used for the magnetic field signal strength of the ferromagnetic material pipeline below 0.1mT.
Damage detection, cracks, material loss, perforation and other damage detection.
This standard is applicable to the direct detection of pipelines that do not handle surface protection or cover layers and the non-excavation inspection of buried pipelines. This standard does not apply
It is used to detect damage at the spiral weld and is not suitable for pipes with metal coating.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 20737 General Terms and Definitions for Nondestructive Testing
3 Terms and definitions
The terms and definitions defined in GB/T 20737 apply to this document.
4 Method summary
4.1 Detection of weak spatial magnetic field distribution signals caused by pipeline damage during operation, through interference removal, data processing and analysis, the pipeline can be judged
The location and type of damage is assessed for damage to the pipeline.
4.2 Features and advantages are as follows.
a) non-contact detection;
b) no need to stop the operation, no need for pigging and other pre-treatment, no need to apply external incentives;
c) have early warning capabilities;
d) Easy to operate and simple, not subject to pipe specs.
4.3 The factors affecting the detection effect are as follows.
a) Pipeline operating conditions, such as pipe size, operating pressure, and time of use, affecting the strength of the magnetic field signal;
b) the difference in geomagnetic fields in different regions;
c) artificial magnetization or degaussing of the pipeline, affecting the accuracy of damage detection;
d) Magnetic field interference outside the pipeline being inspected, such as high voltage lines, ferromagnetic signs, parallel pipes, cross pipes, etc.
Field signal extraction difficulty;
e) detecting the own components of the instrument, such as electronic components, ferromagnetic components, etc., to increase the difficulty of extracting the magnetic field signal induced by the damage;
f) the distance between the detecting instrument and the pipe to be inspected, including the vertical lifting distance, the horizontal offset distance, etc., affecting the strength of the measured magnetic field signal;
g) The change of the relative position of the detecting instrument and the pipe to be inspected, such as the change of the buried depth of the pipe, the change of the attitude of the instrument, etc.
Quantity accuracy.
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