In the second of a two part series, Harri Williams, University of Edinburgh, Derek Muckle, Radius Systems Ltd, and Angus McIntosh, SGN, discuss the assessment of polyethylene systems used for hydrogen gas distribution. In the following article, the results from testing repairability and leak tightness of polyethylene (PE) systems are reported. The investigation provides evidence to support the quantitative risk assessment on the suitability of connecting fittings and welding practices for use in the distribution of hydrogen gas. The construction of a bespoke leak tightness testing facility within a laboratory environment has allowed the safe testing of sample products using pressurised hydrogen gas. Results demonstrate evidence that contemporary PE materials exposed to hydrogen can be repaired, altered and diverted (with connecting joints) with normal industry practices, ensuring the lifetime expectation of at least 50 years is upheld. The work was scoped and funded by SGN, a UK gas distribution company who supplies gas to over 5.9 million customers. The work is essential to support the case for safety for the first of a kind H100 project from SGN who seek to deliver hydrogen produced by renewable energy to 300 homes in Fife, Scotland.
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