Materials
As a result of the initial activities, the project consortium has identified a set of material and geometries deemed representative of H2 and H2NG transport. Both modern and vintage material have been considered. Modern materials, both seamless and welded pipes will be provided by two project partners (CPW, TenarisDalmine). Several full-length pipes have already been secured in the range 12”-36”, API 5L grades, to provide enough material for the experimental activities, both laboratory scale and full scale.
Laboratory testing
All linepipe materials will undergo base lab testing according to the most common standard currently used, ASME B31.12, considering all the material zones of interest (pipe body, seam weld WM and HAZ), at 100% content of H2. Some selected testing will be carried out to investigate the effect of NG blending. In addition, selected testing will be performed adapting more sophisticated testing approaches, characterized by less over-conservatism, to have a better insight within the linepipe materials performance in H2 from both fatigue and fracture perspectives. The test matrix has been defined. The tests will be carried out in the hydrogen testing laboratories of 3 project partners (OCAS, Rosen, GRTgaz).
Full scale testing
The full scale testing will investigate the behavior of damaged linepipes in real scale with high pressure
gaseous H2. The tests will comprise a defined series of fatigue pressure cycles followed by monotonic increase of pressure to burst, to evaluate the damaged linepipe resistance and provide essential data for tuning FFS structural integrity models. The preparation of the dent and dent-gouge samples will adopt an iterative approach to determine the final damage dimensions and methods of damage creation. The test matrix will involve also a full scale burst test with water, used as a reference for standard material behavior. The tests will be carried out at the full scale hydrogen test facility of RINA-CSM.
