Investigation of Hydrogen Leaks from Double Ferrule Fittings

The use of hydrogen is expected to increase rapidly in the future. Leakage of hydrogen pipework are the main forms of safety problems in hydrogen utilization. In this paper, a numerical model of hydrogen leakage and diffusion in pipe joints was established. The Schlieren + high-speed camera is used in experiments to observe the leakage of hydrogen in the pipe joints. In addition, the shape and size of the scratches in the tube were statistically analyzed. Finally, the leakage characteristics of double ferrule joints with scratches are experimentally analyzed. For the two scratch sizes, the critical pressure values for the vortex transition are 0.2 MPa and 0.03 MPa. Through our experimental process, some practical experience and suggestions are given.