H2Leichtbaurohr: Development and validation of high-strength lightweight tubes for the production, transport, and application of pressurized hydrogen

Project description

High-strength lightweight tubes for transporting hydrogen at high pressures can make a significant contribution to achieving climate targets. The aim of the project H2Leichtbaurohr was to develop and validate high-strength and highly ductile lightweight tubes for hydrogen pressure pipes as well as the test procedures required for qualification. In the context of this project, pressurized hydrogen refers to gaseous hydrogen at pressures of up to 1,000 bar for applications ranging from production to consumption.

In addition to the use of innovative material concepts and the associated production know-how, the project developed and tested efficient test methods. To date, there are no standardized test procedures or sample geometries for qualifying the service life of pipes under the influence of pressurized hydrogen for industrial use. A corresponding test concept was developed in the project. This was followed by the validation of the developed pipes. 

Fraunhofer IWM subproject: Development of a service life model for high-strength lightweight pipes for pressurized hydrogen applications

Since pipes in distribution lines that carry pressurized hydrogen are much smaller than transport pipelines, fracture mechanics material characterization and service life assessment according to ASME B31.12 and DVGW Code G 464 are not possible. In addition, there are currently no standardized test methods or sample geometries for qualifying hydrogen pipes for industrial use.

At Fraunhofer IWM, an efficient testing technique was developed and set up using a hydrogen autoclave specially designed for lightweight pipes. The development and validation of a crack-based service life model for hydrogen-carrying pipes was based on the Wöhler curves determined in the hydrogen autoclave. This service life model enables industrial manufacturers and operators of lightweight pipes to evaluate the stresses experienced during operation and to accurately predict the operating life of typical stress scenarios.