Abstract
The main aim of this study is to assess the effectiveness of a composite repair system in severely corroded circumferential welds in super duplex stainless steel pipes as a preventive measure against the premature corrosion damage at the welds. Artificial defects were fabricated on the super duplex steel tube in order to reproduce the localized corrosion damage defects found in real welded joints. Three kinds of through thickness defects were considered: 25%, 50% and 96% of the perimeter of the pipe. The performance of the repaired pipe was assessed by hydrostatic tests as per ISO 24817 standard. The results showed that the composite repair system can sustain the designed failure pressure even for the pipe damaged with through-wall defect up to 96% of the perimeter of the pipe. Hence, the composite repair system can be used as a preliminary tool to protect the unexpected or premature failure at the welds and maintain an adequate level of mechanical strength for a given operating pressure. This composite repair system can assure that the pipe will not leak until a planned maintenance of the line. Nevertheless, further work is still desirable to improve the confidence in the long-term performance of bonded composite.
Highlights
S teel pipelines are commonly used for transportation of fluids over long distance due to its good mechanical properties
The hydrostatic tests were designed to evaluate the performance of composite repair system on superduplex tube test specimens that have a through wall defect simulating a weld bead failure
This study evaluates the effectiveness of composite repair on severely corroded circumferential welds in super duplex stainless steel pipes
Summary
S teel pipelines are commonly used for transportation of fluids over long distance due to its good mechanical properties It becomes corroded as it is exposed to harsh environment without any protection, which causes frequent repair of system or replacement and it imposes more cost [1,2,3,4]. Pipelines with severe corrosion problems have to either be repaired using welding technique or replaced by new ones. In both cases, the offshore unit needs to be shut down as it involves hot work (welding), which can be dangerous, resulting in huge economic loss and delay in productions [4,5,6]. It is possible to have duplex or super duplex steel piping assemblies with significant corrosion damage at the welds (Fig.1)
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