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The reasons and demagnetization methods for magnetic oil and gas pipelines(PDF)

Oil & Gas Storage and Transportation[ISSN:1000-8241/CN:13-1093/TE]

Issue:
2019年06期
Page:
623-628
Research Field:
完整性与可靠性
Publishing date:
2019-06-30

Info

Title:
The reasons and demagnetization methods for magnetic oil and gas pipelines
Author(s):
WANG Weibin1 ZHAO Hong2 YANG Xiaoli2 XIN Zhen3
1. PetroChina Pipeline R & D Center; 2. College of Mechanical and Transportation Engineering, China University of Petroleum (Beijing); 3. CNOOC Petrochemical Engineering Co. Ltd.
Keywords:
oil and gas pipelines demagnetization demagnetization methods permanent magnet
CLC:

PACS:
TE832
DOI:
10.6047/j.issn.1000-8241.2019.06.004
DocumentCode:

Abstract:
During the maintenance and replacement of long-distance oil and gas pipelines, it is necessary to demagnetize the pipelines in order to shorten the replacement cycle and reduce the effect of residual magnetism on the welding quality of pipelines. In this paper, the reasons for the magnetism of oil and gas pipelines were analyzed, e.g. pipeline inspection, external magnetic field and electric field, pipeline welding and friction. Then, the effect of the magnetism of pipeline on its welding and service life and other pipeline inspection methods were studied. Finally, with the demagnetization principle of oil and gas pipeline as the beginning, three pipeline demagnetization methods were proposed to improve the on-line welding quality of oil and gas pipelines, including DC demagnetization method, AC demagnetization method and permanent magnet demagnetization method. The research results play a certain role in guiding the selection of demagnetization methods for oil and gas pipelines in engineering practice. (3 Figures, 24 References)

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Last Update: 2019-06-30