Mar 2021
Gas Distribution
Slow Strain Rate Test and Hydrogen Permeation Correlation
Mar 2021
Apr 2021
Nancy Thomson
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Network Innovation Allowance
GD - Future of gas
Gas Distribution Networks
The UK government has committed to reducing greenhouse gas emissions to Net Zero by 2050. All future energy modelling identifies a key role for hydrogen in providing decarbonised energy for heat, transport, industry and power generation. A key element of transition to hydrogen is to deliver compelling evidence for the enduring use of existing gas network assets in the form of a pathway to decarbonisation.

The Future of LTS project is one of the most advanced projects relating to above 7bar pipelines. The project is designed to develop the safety, technical and practical evidence to support the use of hydrogen in the LTS. A key aspect of the project involves the assessment of the known negative effect that hydrogen can have on the ductility and toughness of line pipe steel, (termed “H2 embrittlement”), which can lead to cracking of the steel. 
The main objectives of the work are to determine whether there is a potential risk of hydrogen embrittlement of gas network pipeline steel by comparing SSRT results in are and in 40 bar hydrogen and to establish a correlation between hydrogen uptake in steel by cathodic charging in aqueous environments with that in gaseous hydrogen under pressure.