In the process of liquid hydrogen transportation, key equipment plays an important role to ensure the safe and stable transportation of liquid hydrogen. Among them, the most critical equipment includes storage vessels, gasification equipment, compressors, and cooling equipment.

Chlorine gas, chemical formula Cl₂. At room temperature and pressure is yellow-green, toxic gas with strong irritant odor, density is larger than air, soluble in water, easy to compress, can be liquefied into golden yellow liquid chlorine, is one of the main products of chlor-alkali industry, can be used as a strong oxidant. Chlorine gas mixed with hydrogen with a volume fraction of more than 5% May be explosive when exposed to bright light. Chlorine gas can be substituted and added with organic and inorganic substances to produce a variety of chlorides. Chlorine was used as a bleaching agent in paper and textile industries in the early days.