PSI - Issue 31

J. Lukács et al. / Procedia Structural Integrity 31 (2021) 51–57 J. Lukács et al. / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 5. Delamination of the reinforcing wrap system (W2) during the a) fatigue test on the PS-B1-1, b) burst test on PS-B-2 pipe section.

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Fig. 6. Reinforced (W3) P2-B2-1 pipe section a) after the fatigue and burst tests, b) after the removing of the wrap located above the flaw.

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Fig. 7. Reinforced (W4) pipe sections after the fatigue and burst tests a) PS-B3-1, b) PS-B3-2.

4. Summary and conclusions Based on our full-scale tests and their results the following main conclusions can be drawn. • The metal loss flaws types (in our case: surface or through, longitudinal or circumferential, separate or interacting) have significant effects on the behavior and the effectiveness of the reinforcing wrap systems. • The investigated reinforcing wrap systems can be used generally for steel pipelines. • The burst pressure divided by Maximum Allowable Operating Pressure can be used as safety factor. The calculated values demonstrate both the reserves of the steel pipes and the usefulness of the wrap systems. The safety factor is capable for the ranking of the reinforcing systems, repairing technologies and wrap materials. The ranking reflects the behavior of the given wrap system in case of a given flaw, in our case metal loss defect, too. • Results of our introduced full-scale tests correspond with the results of previous numerical analyses (Égert and Pere, 2009; Pere et al., 2009; Lukács et al., 2010) for damaged and externally repaired and reinforced pipelines. • Data and databases have a determinant role in the integrity assurance and integrity management of different structures and systems, like pipeline systems (Lukács et al., 2008). With the help of these data and databases, integrity calculations can be performed and management tasks can be solved (Lukács, 2005).