Cryogenic fluid enclosure for cryogenic distillation apparatus, has medium and low pressure columns including respective walls that are contacted with fluid and are made of steel containing specific percentage of nickel and chromium

摘要

The enclosure has medium and low pressure distillation columns (A, B) i.e. medium and low pressure cryogenic separation columns, including a base (13) and respective top portions (14, 15) and walls i.e. shells (10, 11), that are contacted with cryogenic fluid. The walls are made of steel e.g. 201LN(RTM: austenitic chromium-nickel-manganese stainless steel), where the steel contains 5 percentage of nickel, 13 percentage of chromium, 5-9 percentage of manganese, 0.25 percentage of nitrogen, 3 percentage of molybdenum, 1.5 percentage of copper and 0.08 percentage of carbon.