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2009

HyNTS Corrosion

Abstract

The National Transmission System (NTS) pipelines employ a number of external corrosion barrier coatings, primarily coal tar enamel and fusion bonded epoxy (FBE). Cathodic protection is deployed on the network to mitigate for coating failure. Additionally, there are a range of pipeline steels that are used in both above ground buried pipework, both stainless and carbon steels of various grades.

Following the previous NIA project: Research the Impact of Hydrogen on CP & Degradation of Coatings (NIA NGGT0191), the HSE have recommended follow-on testing to fully explore the impact of hydrogen permeation through steel pipelines on corrosion protection systems.

Additionally, the impact of hydrogen on all credible pipeline corrosion mechanisms is to be considered to understand whether current assumptions with regards corrosion rates are valid for hydrogen pipelines.

The project will generate deeper understanding of the impact of hydrogen permeation on external corrosion barrier coatings and cathodic protection systems and the effect this will have on corrosion mitigation procedures for pipelines. Furthermore, knowledge will be gained on the influence of hydrogen on pipeline corrosion mechanisms (such as pitting, SCC, AC/DC).

This data will feed inform on the safe operation of future pipeline networks (both hydrogen blended in natural gas and 100% hydrogen)

These results might be informative to other transmission networks globally. Where appropriate, results will be disseminated via meetings, committees and conferences.
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2025-09-01
2025-09-18
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