Determining the Required Modifications to Safely Repurpose Existing Pipelines to Transport Pure Hydrogen and Hydrogen-Blends

Overview

Main Objective

The project will determine practical methods for optimizing or repurposing existing pipeline networks for the safe transport of pure hydrogen or hydrogen blends. Additionally, the project will provide insight into which existing gas transmission pipeline components and associated facilities may need modifications to safely introduce hydrogen gas or natural gas/hydrogen blends.

Public Abstract

Conversion of existing natural gas and hazardous liquids pipelines to transport and distribute hydrogen or hydrogen-blends will be a necessity to support the growing hydrogen economy. However, this brings technical, economic, and systems-level challenges. Installed components will require fitness-for-purpose assessment, and possible modifications should be evaluated for compatibility with different hydrogen-blend percentages. The objective of this project is to determine practical methods to optimize or repurpose existing pipeline networks to safely transport pure hydrogen or hydrogen-blends.

Anticipated Results: This research will provide insight into which components of existing gas transmission pipelines and the associated gas compression facilities may need modification so that hydrogen gas or natural gas/hydrogen blends can be safely introduced. Knowledge from prior work and pilot projects will be collected through a literature review, with focus on both metallic and non metallic components. Assessment procedures will then be developed to determine the options for reuse, repair, or replacement ("three R" methodology) for components with identified anomalies. This will include a description of procedures for determining acceptable flaw sizes for in-line inspection (ILI) of pipelines repurposed for hydrogen service. The impact of findings on regulatory safety requirements will be reviewed, and suggestions for necessary operator actions will be provided. Pipeline operator end-users will be intimately involved through our academic and highly-represented industry Technical Advisory Panel.

Potential Impact on Safety: Improved understanding of pipeline system limitations for hydrogen service will help pipeline integrity professionals reduce the risk for leaks or ruptures, with their associated environmental impact of gas escaping a pipeline, and hazards to the general public.

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