Corrosion rates can be determined by three methods:

  • Predictive models: Corrosion rates can be obtained from predictive models considering various operating scenarios, i.e., before the onset of corrosion.

  • Monitoring probes: Corrosion rates can be obtained from online monitoring probes as corrosion starts; due for example to operational changes and system upsets.

  • Inspection (Inline inspection and non-intrusive probes): Corrosion rates can only be obtained only after corrosion has removed significant amounts of wall.

Traditionally the oil and gas industry has focused on inspection, i.e., they have focused on following corrosion. In recent years, however, more and more oil and gas companies are utilizing corrosion rates predictive models and monitoring probes, i.e., they have started leading corrosion control.

This paper discusses the logical steps to evaluate and select internal corrosion models and monitoring techniques and properly use them in the field; deliberates the responsibilities of users, tool (model and monitoring techniques) developers, and industry to avoid misuse of tools; presents case studies in which how internal localized corrosion model and monitoring probes have been successfully used to effectively and economically control internal corrosion; and helps the industry in “Leading Corrosion Control” rather than “Following Corrosion”.

Subject
Modeling, Corrosion rate, Industries, Pipelines, Tools, General corrosion rate, Oil and gas, Corrosion modeling, Internal corrosion, Corrosion data, Corrosion protection, Upset, Types of corrosion
Keywords:
5-M methodology, Internal corrosion models, prediction, localized corrosion, monitoring
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2019
Association for Materials Protection and Performance (AMPP)
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