Material and structural integrity assessment for safe Nordic hydrogen transportation infrastructure

Phenomenon called H-embrittlement (HE) is a key threat to the safety of H-pipelines, caused by H ingress into steel, making the pipelines prone to brittle fracture. Low winter temperatures common in the region increase embrittlement further. Remaining scientific challenge is to understand the combined influence of low temperature and HE on the mechanical properties and fracture resistance of steels. This knowledge is required for safe design of H-pipeline infrastructure in the Nordics. The MatHias project will tackle these challenges.

In close cooperation with the industrial partners SSAB (FI), Gasgrid Finland (FI), Aker Horizons Asset Development (NO), and Nordion Energi (SE), the project will: 1) Identify, and bench mark a matrix of vintage and modern pipeline steels, 2) characterize the steels by applying state-of-the-art test methods in relevant environmental conditions, 3) build a material database with mechanical properties and microstructural features as a function of H and temperature, and 4) develop a predictive structural integrity assessment tool that will help pipeline operators to select appropriate steels, assess lifetime and schedule maintenance for Nordic H-pipelines. The project will communicate to the steering group consisting of industrial partners and observers. The research activities will be kept record of, and the outcome monitored constantly and verified where applicable. By the end, a joint review of the work will be performed by all participants, and a common testing and modelling protocol for Nordic H-pipelines will be drafted. The protocol will provide a basis for a design and maintenance standard for H-pipelines and provide reference for research-based policy making for Nordic hydrogen valleys.