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An operator in North America discovered an internal corrosion failure in a wet gas system directly below the point of injection of a water-soluble corrosion inhibitor (CI). Tests using low shear rotating cage autoclaves and a dual autoclave system were performed as a corrosion screening method.
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This work applied the Wet Gas-Internal Corrosion Direct Assessment (WG-ICDA) standard to assess the severity of internal corrosion of 2 segments along a pipeline used to transport wet gas from a gas mine.
Top-of-the-line corrosion (TLC) of carbon steel (CS) pipelines can be encountered during the transportation of wet gas under stratified flow conditions where temperature differences between the internal and external environments results in condensation of saturated vapors and water-wetted surface on the upper portion of the inside pipeline surface causing corrosion issues.1 Initially at least, the condensed water phase can be particularly corrosive with a low pH caused by dissolved acid gases (such as carbon dioxide and hydrogen sulfide) as well as organic acids in an unbuffered thin water film. Like bottom-of-the-line corrosion, TLC can be dominated by either carbon dioxide or hydrogen sulfide corrosion mechanisms.
This standard practice outlines a methodology to assess pipeline integrity because of the threat of internal corrosion for onshore and offshore pipelines and other piping systems that normally carry water-saturated or undersaturated natural and/or raw gas with condensed water, or with water and liquid hydrocarbons, termed wet gas internal corrosion direct assessment (WG-ICDA).
湿气管道内腐蚀直接评价方法
Internal corrosion direct assessment (ICDA) for pipelines carrying natural gas or liquid hydrocarbons with water (wet gas internal corrosion direct assessment (WG-ICDA)). Pre-assessment, Indirect Inspection, Detailed Examination, and Post-assessment.
HISTORICAL DOCUMENT. This standard practice formalizes a methodology to assess internal corrosion for onshore and offshore pipelines and other piping systems that normally carry natural gas with condensed water, or with water and liquid hydrocarbons, termed wet gas internal corrosion direct assessment (WG-ICDA). This standard is maintained by Task Group 305.
Internal corrosion direct assessment (ICDA) for pipelines carrying wet gas. (WG-ICDA). Four components of ICDA: Preassessment, Indirect Inspection, Detailed Examination, and Postassessment.
In oil and gas production, corrosion is a major cause of failures. These failures result in significant environmental contaminants, safety problems, increase in the high operating costs and decrease in the production rates. Extensive literature is available about various corrosion drivers and their mechanisms, helping operators to avoid or mitigate these catastrophic failures.