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Failure analysis of welded joint leakage of TP321 pressure pipeline
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NSTL
Elsevier
Considering the continuity of production in petrochemical plants and the harmfulness of leakage, any slight defect in the system may lead to dramatic accidents. Therefore, we used systematic characterization methods to analyze the causes of leakage near the weld of outdoor pressure pipe in a petrochemical plant. It is found that the crack extends from the outside into the inside surface of the pipe wall, and there are massive corrosion products on the crack surface. Furthermore, the damaged parts observed of the external insulating layer are wet and accumulate chlorine, which from the corrosive environment to the pipe material. Finally, it is concluded that microcracks originate from pitting pits and gradually expand to the inner surface with the coaction of internal pressure of the pipe up to 12 MPa. The reason of pipe leakage is the interaction of pitting corrosion, transgranular corrosion, and stress corrosion cracking.
NSTL
Elsevier
