Effect of Electrolysis Corrosion Prevention for External Corrosion Control on the Pipeline

Based on one-year laboratory experiments in which samples were exposed to temperatures as low as −45°C and two-year data from field experiments, it is concluded that Canadian Standards Association (CSA) standards CSA Z662, CSA Z245.20 and CSA Z245.21 adequately address evaluation of coatings for northern pipelines. However, in order to evaluate the effects of low temperatures, specimens should be exposed for at least four months. Coatings qualified by CSA Z245.21 (System B1 and B2) are less affected by exposure to low temperatures than those qualified by CSA Z245.21 (System A1) and CSA Z245.20. Corrosion potentials measured at lower temperatures are in the range of potentials to use the cathodic protection (CP) potential criteria of −0.85 V vs. copper-copper sulphate for northern pipelines.

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M27 External Corrosion Control for Infrastructure Sustainability, Third Edition

10.12999/awwa.m27ed3 ◽

2013 ◽

Author(s):

Keyword(s):

Corrosion Control ◽

External Corrosion

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Corrosion Control for Safety and Integrity of Pipelines

Volume 5: High Pressure Technology, Nondestructive Evaluation, Pipeline Systems, Student Paper Competition ◽

10.1115/pvp2006-icpvt-11-93429 ◽

2006 ◽

Author(s):

Wael A. El Kholy

Keyword(s):

Human Body ◽

Outer Surface ◽

Working Life ◽

Corrosion Control ◽

Corrosion Prevention ◽

Surface Corrosion ◽

Underground Pipelines ◽

Oil Gas

Corrosion directly affects our lives by reducing the integrity of possessions. All pipelines, even the best designed and maintained, deteriorate with time. The primary cause of this deterioration is corrosion. Corrosion in metal can be compared to cancer in human body. Both act very slowly without being easily visible and by the time one notices it, serious damage has been done. Owing to corrosion, billions of dollars are wasted in various industries, refineries, petrochemical plants and various underground pipelines and structures in the field of oil, gas, water etc. For the safety and integrity of underground pipelines it is imperative to adopt various methods of corrosion prevention to retard corrosion and thus increase the active working life of pipelines. This paper provides information about various types of corrosion and methods of both inline and outer surface corrosion inspection and monitoring. It also discusses means of pipeline protection, corrosion control and rehabilitation.

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