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Corrosion Management Review of Sour Gas Pipeline – A Case Study

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This paper reviews the corrosion management for a critical sour gas pipeline operated by Saudi Aramco. The 38-inch diameter pipeline transports untreated sour gas from Crude Processing Facility (CPF) to downstream Gas Plant and spans a total distance of 145 km. To prevent internal corrosion inside the pipeline, the wet sour gas is dehydrated using Tri-Ethylene Glycol (TEG) unit.

Product Number: 51323-18855-SG
Author: Muntathir M. Al-Jumaah, Faisal M. Al-Mutahhar, Muhammad A. Sherwani
Publication Date: 2023
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$20.00
$20.00

A comprehensive corrosion management review was conducted for a 38-inch diameter pipeline transporting dehydrated sour gas from Central Processing Facility (CPF) to downstream Gas Plant. The pipeline, which has been in service for more than ten (10) years, was constructed of bare carbon steel and equipped with a scraping facility and corrosion inhibitor injection skid that is operated by the CPF only during Tri-Ethylene Glycol (TEG) Dehydration Unit upset or off-spec conditions. After two (2) years of operations, an in-line inspection (ILI) was conducted which provided an early indication of internal corrosion that correlated with occasional process deviations and presence of solid debris in the pipeline. The study assessed the performance of existing corrosion mitigation measures and evaluated the need for continuous corrosion inhibitor injection. An enhanced corrosion mitigation plan was recommended to manage the corrosion risks during off-spec conditions.

A comprehensive corrosion management review was conducted for a 38-inch diameter pipeline transporting dehydrated sour gas from Central Processing Facility (CPF) to downstream Gas Plant. The pipeline, which has been in service for more than ten (10) years, was constructed of bare carbon steel and equipped with a scraping facility and corrosion inhibitor injection skid that is operated by the CPF only during Tri-Ethylene Glycol (TEG) Dehydration Unit upset or off-spec conditions. After two (2) years of operations, an in-line inspection (ILI) was conducted which provided an early indication of internal corrosion that correlated with occasional process deviations and presence of solid debris in the pipeline. The study assessed the performance of existing corrosion mitigation measures and evaluated the need for continuous corrosion inhibitor injection. An enhanced corrosion mitigation plan was recommended to manage the corrosion risks during off-spec conditions.

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The hydrocarbon exploration in the ocean and deep sea was started as early as early as the 1850s, when the first drilling was carried out in California, USA. Other early oil explorations activities were later recorded in Pakistan (1886), Peru (1869), India (1890) and Dutch East Indies (1893). The development of an offshore industry is directly related to the development of subsea pipelines as well. As the industry expands towards deeper waters, the pipelines are required to have better materials, designs, operation practices and maintenance strategies to withstand the challenging environments. These pipelines are exposed to elevated temperatures, high pressures, and corrosive fluids.
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