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Design Of Cathodic Protection System For Duplex Stainless-Steel Pipeline: Protection Criteria And Hydrogen Embrittlement Management

Design of Cathodic Protection System for Duplex Stainless-Steel Pipeline: Protection Criteria and Hydrogen Embrittlement Management
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A life cycle cost assessment led to the selection of DSS for field gas gathering network composing of more than 200 miles of pipelines. Buried portions are provided with external coating. Furthermore, due to high chloride content in the soils, the external corrosion threat was mitigated through the use of an external coating supplemented with CP. 

As there was no industrial reference covering onshore DSS pipeline CP criteria, lab testing was conducted to establish the criteria and confirm if the risk of hydrogen embrittlement is managed appropriately. This is further evaluated with field data to confirm pipelines integrity.   

Product Number: 51322-18124-SG
Author: Ashraf Al Aasmi, Kathy Buckingham, Ziru Zhang, Timothy Bieri
Publication Date: 2022
Industries: Test Method , Coatings
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Duplex stainless steel (DSS) is selected for wet gas pipeline to minimize OPEX and eliminate maintenance activities for internal corrosion control. DSS, however, requires a combination of coating and cathodic protection (CP) for external corrosion mitigation due to harsh external conditions (e.g., high operating temperature and high chloride level in the soil) in the Middle East. CP design and operation for DSS pipeline faces a major challenge as there is no applicable published industry standard or technical research for protection criteria for DSS.  

Duplex stainless steel (DSS) is selected for wet gas pipeline to minimize OPEX and eliminate maintenance activities for internal corrosion control. DSS, however, requires a combination of coating and cathodic protection (CP) for external corrosion mitigation due to harsh external conditions (e.g., high operating temperature and high chloride level in the soil) in the Middle East. CP design and operation for DSS pipeline faces a major challenge as there is no applicable published industry standard or technical research for protection criteria for DSS.  

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Product Number: 51300-07078-SG
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Product Number: 51322-18065-SG
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Corrosion control of buried assets usually involves a double shield: a coating system as a physical insulation barrier, and a cathodic protection system as an additional ad hoc defense. Detection of a corrosion spot at the coating defect stage is the only way to identify the threat before significant metal loss occurs. Furthermore, detection of defects in the coatings of such assets is especially important, since large defects, if left unrepaired, will not only leave the asset locally prone to corrosion, but also drain and weaken the cathodic protection effectiveness for the entire structure. Therefore, identification and characterization of coating anomalies is critical for the integrity of buried assets. 
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