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10210 Microbiologically Influenced Corrosion Failure of a Crude Oil Pipeline

Picture for 10210 Microbiologically Influenced Corrosion Failure of a Crude Oil Pipeline
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Product Number: 51300-10210-SG
ISBN: 10210 2010 CP
Author: Saleh A. Al-Sulaiman, Abdul Wahab Al-Mithin, Abdul Razzak Al-Shamari, Moavin Islam and Surya Prakash
Publication Date: 2010
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Severe internal corrosion, with over 50% thickness loss in many locations, was encountered in a 610 mm (24-inch) diameter, API 5L Grade-B Sch-20 carbon steel pipeline used for carrying light crude oil (LCO) from a wet tank to a common header. The design life of such a pipeline is typically more than 30 years; however, the severe corrosion damage occurred after about 7 years of service. A detailed investigation was conducted to determine the root cause of the severe internal corrosion damage.

The morphology of the corrosion damage on the internal surface of the pipe was in the form of extensive localized corrosion, resembling large terraced pits. The type and severe rate of corrosion observed in the pipeline was very similar to previous coupon data obtained in the same facility (LCO wet tank). High concentrations of sessile SRB (Sulphate Reducing Bacteria) and GAnB (General Anaerobic Bacteria) were identified in coupon scrapings. A higher H2S content was identified in the fluid downstream of the LCO wet tank compared to that found in the LCO wet tank indicating that the excess H2S was most likely the result of SRB activity. Based on the investigation results and other related information, it was concluded that the severe corrosion damage was due to microbiologically influenced corrosion (MIC).

Keywords: Failure Analysis, Light Crude Oil, MIC, SRB, Localized Corrosion
Severe internal corrosion, with over 50% thickness loss in many locations, was encountered in a 610 mm (24-inch) diameter, API 5L Grade-B Sch-20 carbon steel pipeline used for carrying light crude oil (LCO) from a wet tank to a common header. The design life of such a pipeline is typically more than 30 years; however, the severe corrosion damage occurred after about 7 years of service. A detailed investigation was conducted to determine the root cause of the severe internal corrosion damage.

The morphology of the corrosion damage on the internal surface of the pipe was in the form of extensive localized corrosion, resembling large terraced pits. The type and severe rate of corrosion observed in the pipeline was very similar to previous coupon data obtained in the same facility (LCO wet tank). High concentrations of sessile SRB (Sulphate Reducing Bacteria) and GAnB (General Anaerobic Bacteria) were identified in coupon scrapings. A higher H2S content was identified in the fluid downstream of the LCO wet tank compared to that found in the LCO wet tank indicating that the excess H2S was most likely the result of SRB activity. Based on the investigation results and other related information, it was concluded that the severe corrosion damage was due to microbiologically influenced corrosion (MIC).

Keywords: Failure Analysis, Light Crude Oil, MIC, SRB, Localized Corrosion
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