Hydrogen (H2) is an odorless, colorless and tasteless gas that is mainly produced through natural gas steam reforming or the electrolysis of water. Lighter than air, it burns with an invisible, clean (carbon-free and soot-free) flame. It is the only fuel gas that does not contain any carbon atoms. This report mainly covers the compressed hydrogen gas and liquid hydrogen product type. They are widely used in general Industry, metal working, refining and chemical.