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51317--9519-Development of Application Friendly Products for Wet Gas Corrosion Inhibition

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.

Product Number: 51317--9519-SG
ISBN: 9519 2017 CP
Author: Jeffery Clark
Publication Date: 2017
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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). Upon further investigation an inconsistency was found between the standard laboratory based carbon steel immersion corrosion rate of the neat water-soluble corrosion inhibitor and the observed corrosion rate based on the field time to failure. For this reason studies were conducted to uncover the discrepancy between the laboratory compatibility test and the observed field corrosion rate in a wet gas system. Tests using low shear rotating cage autoclaves were performed as a corrosion screening method of the neat CI. Additionally it was desired to ensure that the product would travel with the gas and provide corrosion inhibition throughout the entire system. For this reason an additional study was conducted using a dual autoclave system to study the ability of the product to travel with a stream of gas effectively inhibiting the entire gas system. Using these findings from the corrosivity evaluation and the CI transport studies criteria for CI qualification in gas systems are recommended as best practices.

Key words: Wet Gas, Corrosion Inhibitor Qualification, Corrosion Rate, Immersion Test, Neat Chemical Compatibility

 

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). Upon further investigation an inconsistency was found between the standard laboratory based carbon steel immersion corrosion rate of the neat water-soluble corrosion inhibitor and the observed corrosion rate based on the field time to failure. For this reason studies were conducted to uncover the discrepancy between the laboratory compatibility test and the observed field corrosion rate in a wet gas system. Tests using low shear rotating cage autoclaves were performed as a corrosion screening method of the neat CI. Additionally it was desired to ensure that the product would travel with the gas and provide corrosion inhibition throughout the entire system. For this reason an additional study was conducted using a dual autoclave system to study the ability of the product to travel with a stream of gas effectively inhibiting the entire gas system. Using these findings from the corrosivity evaluation and the CI transport studies criteria for CI qualification in gas systems are recommended as best practices.

Key words: Wet Gas, Corrosion Inhibitor Qualification, Corrosion Rate, Immersion Test, Neat Chemical Compatibility

 

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