The SSLC High-Performance Pressurization System (HPPS) is based on tridyne. Tridyne is a system made of Helium (He), gaseous H2, gaseous O2, and a catalyst bed. Very little quantities of GH2 and GOX enrich He (which is the pressurant gas). Due to the predominance of helium in the mixture, this is a safe system. During operation, GH2 and GOX react on the catalyst bed and produce small quantities of water and a lot of heat, which increases the temperature of the He. The tridyne tank, internally, is configured with a heat exchanger. Thanks to this system, it is possible to save about 50% in mass of both the pressurant gas and the pressurant tank. The key advantage of the HPPS is that it is not a blowdown system. HPPS is a low-cost solution that has virtually no moving parts.