Reinforcement test of epoxy-filled steel sleeves for girth weld defects of X80 pipelines

YU Dongliang; YANG Chuan; WU Dongrong; WANG Ailing; HUANG Hui; JIA Bin; ZHANG Yu

doi:10.6047/j.issn.1000-8241.2021.09.005

Oil & Gas Storage and Transportation > 2021 > 40(9): 997-1007. > DOI: 10.6047/j.issn.1000-8241.2021.09.005

YU Dongliang, YANG Chuan, WU Dongrong, WANG Ailing, HUANG Hui, JIA Bin, ZHANG Yu. Reinforcement test of epoxy-filled steel sleeves for girth weld defects of X80 pipelines[J]. Oil & Gas Storage and Transportation, 2021, 40(9): 997-1007. DOI: 10.6047/j.issn.1000-8241.2021.09.005

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Reinforcement test of epoxy-filled steel sleeves for girth weld defects of X80 pipelines

1.
PipeChina Southwest Pipeline Company
2.
School of Civil Engineering and Architecture, Southwest University of Science and Technology
3.
Sichuan Deyuan Pipeline Technology Co.Ltd.

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Received Date: April 29, 2021
Revised Date: August 03, 2021
Available Online: August 20, 2023

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Abstract

Abstract

In order to verify the applicability of epoxy-filled steel sleeves for reinforcement of the girth weld defects in X80 steel pipelines, X80 pipe fittings with 1 016 mm diameter were selected as the specimens and on the specimens two girth welds with same defects were set by manual welding. Definitely, one of the welds was reinforced with an epoxy-filled steel sleeve, while the other was not. Then, the full-scale mechanical tests were performed under the internal pressure, fluctuation pressure and the coupling effect of internal pressure and bending moment for the above two defective girth welds with/without reinforcement. In addition, the failure mode, bearing capacity and deformation performance of the two specimens were compared and analyzed. The results show that the hoop and axial stresses of the girth weld defects reinforced by the epoxy-filled steel sleeve under the operating pressure is reduced, and the sleeve shares 47% of the internal pressure. The stress of the girth weld defects reinforced by the epoxy-filled steel sleeves under the cyclic fluctuating pressure is kept unchanged, which indicates that the stress level of the sleeve reinforced girth weld defects is stable, without changing with the fluctuation of the pressures. In addition, under the coupling effect of the internal pressure and the bending moments, the failure mode of the unreinforced pipeline is overall fracture of the weld section, while the failure mode of the reinforced pipeline is local buckling failure in the pressure region after the yield of the steel in the tensile region, which indicates that the epoxy-filled steel sleeves increase the bending capacity of the pipelines and reduce the bending deflection. In brief, the research results can provide a reference to the engineering application of reinforcing the defective girth welds of X80 pipelines with epoxy-filled steel sleeves.
- X80 pipelines,
- epoxy-filled steel sleeves,
- girth welds,
- defects,
- mechanical tests

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References (24)

References

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Reinforcement test of epoxy-filled steel sleeves for girth weld defects of X80 pipelines

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