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The Importance of Deposit Characterization in Mitigating UDC and MIC in Dead Legs

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Under deposit corrosion (UDC) and microbiologically influenced corrosion (MIC) are threats to dead legs and low flow/intermittent flow pipelines.  Deposit characterization methods, corrosion mechanisms, mitigation methods and monitoring are addressed.

Product Number: 51317--9128-SG
ISBN: 9128 2017 CP
Author: Christopher Kagarise
Publication Date: 2017
Industry: Pipelines, Tanks, and Underground Systems
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Under deposit corrosion (UDC) and microbiologically influenced corrosion (MIC) are recognized threats to dead legs and low flow/intermittent flow pipelines particularly in facilities. A number of internal corrosion pipeline failures across the industry due to UDC and MIC have occurred due to the accumulation of solids in the piping coupled with the inability to detect the deposits and effectively remove them. While the need to mitigate UDC and MIC is recognized the appropriate actions to address the problem and prevent its recurrence may take significant effort to determine and will likely differ from location to location due to the unique operating conditions history and deposit characteristics at each site. In addition there is the potential for multiple corrosion mechanisms (i.e. MIC and UDC) to occur separately or concurrently and the presence of organic and inorganic solids/deposits on the pipe surface can haveinvolvement with both mechanisms. Thus effective mitigation relies on understanding the nature of the solids/deposits present on the internal pipe surface determining the corrosion mechanism(s) and developing a mitigation method that addresses the mechanism of corrosion and targets the specific characteristics of the solids/deposits.

Under deposit corrosion (UDC) and microbiologically influenced corrosion (MIC) are recognized threats to dead legs and low flow/intermittent flow pipelines particularly in facilities. A number of internal corrosion pipeline failures across the industry due to UDC and MIC have occurred due to the accumulation of solids in the piping coupled with the inability to detect the deposits and effectively remove them. While the need to mitigate UDC and MIC is recognized the appropriate actions to address the problem and prevent its recurrence may take significant effort to determine and will likely differ from location to location due to the unique operating conditions history and deposit characteristics at each site. In addition there is the potential for multiple corrosion mechanisms (i.e. MIC and UDC) to occur separately or concurrently and the presence of organic and inorganic solids/deposits on the pipe surface can haveinvolvement with both mechanisms. Thus effective mitigation relies on understanding the nature of the solids/deposits present on the internal pipe surface determining the corrosion mechanism(s) and developing a mitigation method that addresses the mechanism of corrosion and targets the specific characteristics of the solids/deposits.

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