Abstract
Type B sleeve repair technology is favored by users for its advantages (including no emptying required of the pipeline for repair and the permanency of the repair). There were few reports on the research and application of high-grade type B sleeve. Whether X70 steel grade type B sleeve and its supporting technology developed by TGRI can be applied under the actual working conditions on site and widely used remains to be studied. Therefore, the technology was applied to the repair of girth weld defects of gas transmission pipeline of Φ1016 mm fabricated from grade X80 steel, and the pipe section was analyzed after 2 months of operation under pressure. The reliability and feasibility of the technology were verified and analyzed by means of hydrostatic cycle test, nondestructive testing, macro-inspection and mechanical property analysis. The results show that: (1) Under the high pressure fluctuation of 0–10 MPa and 1.25 times the design pressure, the girth weld crack and fillet weld defect size did not change, and the pipeline system can operate safely even if the girth weld has penetrating defects(through-wall); (2) PAUT has a certain ability to identify diagonal weld defects, but it has a large error in location and size measurement of defects; (3) the results of nondestructive inspection, defect morphology, hammer break test fracture and macro-inspection show that there are few defects in the fillet weld and the sizes are small, indicating that this technology performs well in defect control and is applicable under the working conditions on site; and (4) tensile, hardness, toughness, bending and other performance indexes meet the requirements of relevant standards. It is concluded that X70 high steel grade type B sleeve and its supporting technology can ensure the long-term safe operation of defective pipelines. It is recommended to be widely used in oil and gas pipelines.
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Wang, G., Ren, G., Deng, B. et al. Verification Analysis of X70 Type B Sleeve for In-service Pipeline Repair. J Fail. Anal. and Preven. 23, 1137–1149 (2023). https://doi.org/10.1007/s11668-023-01655-2
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DOI: https://doi.org/10.1007/s11668-023-01655-2