Internal corrosion of natural gas pipelines is the result of interaction between the inside pipe wall and impurities in the product being transported. Such interactions can lead to an overall loss of material thereby thinning the pipe wall and thus reducing the range of operating pressure. Corrosion, however, tends to be localized along the pipeline with some areas experiencing significant corrosion rates and others much less so. Part of the variability arises from both spatial and temporal differences in the composition of the product. For example, brines may be observed in segments of natural gas pipelines close to producing areas (i.e., carry-over produced water), but condensed water are more likely further downstream (i.e., without chlorides). Some of the common corrosion inducing species includes carbon dioxide, hydrogen sulfide, water, salts (such as chloride), solids and precipitates, organic acids, and microorganisms. As a consequence of the wide range of possible corrosion inducing species, their inherent variability with both position and time within the pipeline, accurate inspection and determination of the true condition within the pipeline is difficult.
PHMSA project DTRS56-05-T-0005 "Development of ICDA for Liquid Petroleum Pipelines" led to the development of a Direct Assessment (DA) protocol to pri...
These guidelines provide recommendations for the assessment of new and existing natural gas and liquid hydrocarbon pipelines subjected to potential gr...
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.
United States Department of Transportation
[PDF-2.09 MB]
