The Impact of Hydrogen on the Integrity of Natural Gas Transporting Pipelines
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Abstract
As demand for hydrogen increases worldwide, consequently does the need to transport it. Pipeline transport is an economical and efficient form of transport. Given that, at the same time, the utilisation of the natural gas transmission network is forecast to decrease, it is logical to aim to use the system for transport of hydrogen-containing media. As a first step, hydrogen blending into natural gas could be a viable option. The aim of this publication is twofold: firstly, to provide an outline of the issues involved in hydrogen blending into the natural gas network and, secondly, to highlight the challenges involved, using the example of a steel pipe material quality. The challenges associated with blending, the damage modes caused by hydrogen, their impact on pipeline integrity and the current hydrogen blending practices will be summarized. Using a typical pipeline steel grade (X52) as an example, the variation of basic mechanical properties in hydrogen and brine media will be illustrated. The acquired experience highlights the importance of respecting the principle of gradualism and the need to take account of local specificities.
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