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Effect of Injection Method Towards Volatile Corrosion Inhibitor Efficacy in Wet Gas Pipelines
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DOI：10.17576/jsm-2026-5504-11.png)
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Abstract
En 中文
Pigging is performed before the injection of Volatile Corrosion Inhibitors (VCIs) to remove corrosion products and other residues from the internal surface of the pipeline. This process results in pre-corroded surface conditions, which raises concerns regarding the effectiveness of VCIs under such circumstances. Additionally, optimal dosage and injection method are critical for VCI to serve a dual role in mitigating top-of-line corrosion and bottom-of-line corrosion in wet gas pipelines. In this study, 1000 ppm VCI was injected using batch and continuous methods under non-corroded and pre-corroded conditions to evaluate the performance of API 5L X65 carbon steel using a TLC setup following the weight loss method (ASTM G1-03). Experimental results demonstrate that the VCI significantly reduces uniform corrosion rates (UCR) particularly at the bottom-of-line, achieving a maximum of 98% inhibition efficiency. However, with the overall pitting rates (PR) were reduced, localized attacks became the dominant. The VCI continuous injection method proved more effective in reducing the general corrosion severity but remained insufficient for controlling localized pitting case. On the other hand, pre-corrosion conditions facilitate VCI effectiveness in reducing severity at the top-of-line; however, this effect is not observed at the bottom-of-line. Lifespan predictions correlated closely with both UCR and PR, showing that high-dosage VCI application via either batch or continuous injection alone does not provide adequate long-term protection, regardless of the initial surface condition. These findings suggest that a hybrid approach combining multiple injection methods may be necessary to further mitigate corrosion severity and extend the operational lifespan of the pipeline.
Keywords:
Batch injection method
bottom-of-line corrosion
continuous injection method
pre-corroded condition
top-of-line corrosion
volatile corrosion inhibitor
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