In-line inspection guides integrity assessment, rehabilitation of sour-gas pipeline

Damage assessment by in-line inspection and rehabilitation of a sour-gas pipeline in Mexico revealed, among other findings, that ILI data are not always accurate and that metal loss by corrosion was the principal integrity issue.The program determined that future safe operation of the pipeline required limiting its throughput to 200 MMscfd and maintaining a continuous fluid regime in order to mitigate hydrogen-induced cracking (HIC). No rerating was deemed necessary for the next 10 years.Described here are the damage assessment and rehabilitation of the Ciudad Pemex-La Isla 24-in. sour gas pipeline managed and operated by Petróleos Mexicanos SA (Pemex). The assessment of the pipeli...

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