Investigation Of On-Stream Pipe Repairing For Oil And Gas Applications
Leakage of pipelines in refinery plants is a major issue that can affect the plant efficiency and safety. Pipelines leak can be caused by many factors. One of the most common factors is pipe corrosion that results to the pipe thinning, In some extend, consistent vibration of the pipe can also lead t...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/25495/1/Investigation%20Of%20On-Stream%20Pipe%20Repairing%20For%20Oil%20And%20Gas%20Applications.pdf http://eprints.utem.edu.my/id/eprint/25495/2/Investigation%20Of%20On-Stream%20Pipe%20Repairing%20For%20Oil%20And%20Gas%20Applications.pdf |
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| Summary: | Leakage of pipelines in refinery plants is a major issue that can affect the plant efficiency and safety. Pipelines leak can be caused by many factors. One of the most common factors is pipe corrosion that results to the pipe thinning, In some extend, consistent vibration of the pipe can also lead to crack, which consequently result to leakages. Minor leaks can be sealed without shutting down the units. There are ways to repair piping leaks on stream as specified by American Petroleum Institute (API) 570 Piping Inspection Code. The leaks can be repaired on stream cither by using full encirclement welded split sleeve enclosure, fillet welding or patches insertion. Both methods are categorized as temporary welding repairs. Alternatively, a specifically designed bolted clamp can be installed to seal the leak temporarily before permanent repair is performed. In this study, a feasibility study was performed to examine temporary pipe crack repair. A mock up testing rig that represent the actual on-site condition was developed. Fillet welding and patch insertion were performed on the stainless-steel pipe (Schedule 10). Burn through marks and maximum inner surface temperature of the pipe was examined. Finite Element Analysis (FEA) was also performed to provide supportive temperature data of the repair process. The results suggest that fillet welding is too risky to be performed on-stream as the inner surface temperature is way passing the product auto-ignite temperature. |
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