Hydrogen can diffuse through metals – the reason why metals lose their strength. This process, referred to as hydrogen embrittlement, can be prevented by using suitable materials such as austenitic steels (316 or 316L).
When combined with oxygen, hydrogen can form an ignitable mixture. In order to ensure safety, especially in enclosed spaces, the tightness of installed components is of key significance.
Having a low energy density in relation to its volume, hydrogen is compressed for storage and for the refueling process. The initial pressure of the hydrogen is constantly being increased, the reason why pressures of various intensities have to be controlled.