Maximum Pressures of Filled Vessel Warming to 300K without Venting Cryogen Maximum Mpa (psi) Pressure ____________________________________________ Helium Hydrogen Nitrogen
103 (15,000) 172 (25,000) 296 (43,000)
Explosions caused by improper venting or accidental rapid
warming of evaporating cryogens are the single biggest safety hazard. This is because cryogenic liquids have a much higher density than their gases at room temperature. 4