Analisa Laju Korosi dan Perhitungan Lifetime Material Carbon Steel API 5L X52 pada Subsea Pipeline

Abstract

Corrosion is challenge and obstacle for several oil and gas industries, especially in
pipeline. This problem becomes more complicated if a pipeline is corroded both externally and
internally. This is the case for a subsea pipeline facility at an oil and gas company in Tuban, where
external corrosion is affected by the seawater environment and internal corrosion is affected by H 2 S
gas content in crude oil. API 5L X52 is general material used in this industry, with the advantage of
good resistance at a low price. Corrosion in subsea pipelines has consequences such as loss of
production, pipe leaks, and expensive maintenance. This study aims to determine the corrosion rate of
API 5L X52 material, either caused by seawater or H2S gas in crude oil. Subsea pipelines were
modeled with immersion tests conducted for 720 hours. From the results of this study, it was found
that the corrosion rate in seawater with pH 7,2 has a higher value than the H2S gas content in crude
oil. In addition, API 5L X52 material is not good enough in corrosion resistance in seawater
environment without protection. Where, the lifetime value of API 5L X52 is only around 10 years at
actual thickness.