ISO 15859-2:2004 (R2020)

ISO 15859-2:2004 specifies limits for the composition of hydrogen and establishes the sampling and test requirements applicable for the verification of the hydrogen composition. ISO 15859-2:2004 is applicable to hydrogen used in both flight hardware and ground facilities, systems and equipment, of the following types and grades: Type I, gaseous (Grade A: fuel, Grade F: fuel) and Type II, liquid (Grade A: fuel, Grade F: fuel). ISO 15859-2:2004 is applicable to influents only to the extent specified. ISO 15859-2:2004 is applicable to any sampling operation required to ensure that, when the fluid enters the launch vehicle or spacecraft, the fluid composition complies with the limits provided hereafter or with any technical specification agreed to for a particular use.