Analisis Risiko Penyebab Kegagalan Pipa Penyalur Crude Oil
DOI:
https://doi.org/10.55606/teknik.v5i1.5732Keywords:
Failure Analysis, API 5L Grade B, Crude Oil, Internal Corrosion, Distribution PipesAbstract
The distribution pipe refers to API 5L Grade B standard, 8 inches in diameter, has a length of 212 km. The design life of pipe is 20 years, but after being operated, there were two leaks in this segment in one year. This condition resulted in disruption of oil deliveries. Research is needed to determine the cause of pipe failure before its design life. Pipe samples are subjected to visual observation, thickness test, chemical composition of the pipe, microstructure test, Characterization test of pipe corrosion product deposits. Produced water are testing to determine anions, cations and the tendency for scale formation with Valone & Skillern references. The visual test results showed that the inside of the pipe was thinning at 6 o'clock. Chemical composition testing showed that there was no difference in chemical composition with API 5L Grade B standards. SEM results in the leak area revealed the corrosion morphology caused by dissolved CO2. XRD analysis of the corrosion deposits formed were siderite (Fe2CO3), hematite (Fe3O4) and iron (Fe) compounds. Pipe failure occurs due to corrosive substances in the form of produced water. This situation causes the surface of the pipe to be exposed to produced water at the 6' o'clock position, initiating the formation of hydrogen ions (H+) and ions (HCO3-).
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