Repair Reliability Analysis of a Special-Shaped Epoxy Steel Sleeve for Low-Strength Tee Pipes
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials Properties
2.2. Design of the Special-Shaped Steel Sleeve
2.3. Repairing Test of SSESS
- Step 1: Surface cleaning and sand-blasting
- Step 2: Experiments with strain monitoring
- Step 3: Installation of a special-shaped steel sleeve
- Step 4: Injecting process
- Step 5: Epoxy resin curing process
2.4. Hydraulic Burst Test
2.5. Simulations
3. Results
4. Discussion
5. Conclusions
- (1)
- The critical design parameters for the special-shaped sleeve are the minimum thickness, the material properties of the sleeve, the length between the edge of the sleeve and the girth weld, the gap between the sleeve and the tee, and the locations of the injection and exhaust holes.
- (2)
- The strain concentrations of the unrepaired tee were greatly reduced, especially for the belly. The maximum strain was ~0.006 on the outer surface of the belly, and it decreased from ~0.006 to ~0.001 under hydrostatic pressure of 24 MPa, where the decreasing rate was about 80%.
- (3)
- The yielding and burst pressure was improved from ~32 MPa and ~48.6 MPa to ~42 MPa and ~50.8 MPa, respectively, which demonstrates the good reliability of the special-shaped epoxy resin steel sleeve repairing low-strength tee.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Yield Strength (MPa) | Ultimate Tensile Strength (MPa) | Elongation (%) | |
---|---|---|---|
S1 (branch pipe) | 343 | 539 | 29.5 |
S2 (shoulder) | 374 | 502 | 29.5 |
S3 (main pipe) | 363 | 553 | 27.5 |
Properties | Unit | Requirements |
---|---|---|
Hardness of the resin after curing | Shore D | 80 ± 10 |
Mass solid content | % | ≥99.5 |
Curing shrinkage | % | ≤0.4 |
Compressive strength of the resin after curing | MPa | ≥50 |
(50% deformation) | MPa | ≥10 |
Shear strength | MPa | ≥10 |
Region of Tee | E (GPa) | K (MPa) | n |
---|---|---|---|
S1 | 207 | 281.0 | 0.295 |
S2 | 211 | 183.5 | 0.295 |
S3 | 209 | 271.0 | 0.275 |
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Cao, J.; Jia, H.; Ma, W.; Wang, K.; Yao, T.; Ren, J.; Nie, H.; Liang, X.; Dang, W. Repair Reliability Analysis of a Special-Shaped Epoxy Steel Sleeve for Low-Strength Tee Pipes. Metals 2022, 12, 2149. https://doi.org/10.3390/met12122149
Cao J, Jia H, Ma W, Wang K, Yao T, Ren J, Nie H, Liang X, Dang W. Repair Reliability Analysis of a Special-Shaped Epoxy Steel Sleeve for Low-Strength Tee Pipes. Metals. 2022; 12(12):2149. https://doi.org/10.3390/met12122149
Chicago/Turabian StyleCao, Jun, Haidong Jia, Weifeng Ma, Ke Wang, Tian Yao, Junjie Ren, Hailiang Nie, Xiaobin Liang, and Wei Dang. 2022. "Repair Reliability Analysis of a Special-Shaped Epoxy Steel Sleeve for Low-Strength Tee Pipes" Metals 12, no. 12: 2149. https://doi.org/10.3390/met12122149
APA StyleCao, J., Jia, H., Ma, W., Wang, K., Yao, T., Ren, J., Nie, H., Liang, X., & Dang, W. (2022). Repair Reliability Analysis of a Special-Shaped Epoxy Steel Sleeve for Low-Strength Tee Pipes. Metals, 12(12), 2149. https://doi.org/10.3390/met12122149