A Study of Liquid Cylinder Filling Techniques
Liquid cylinders are double-wailed, laminar-insulated containers designed for storage of cryogenic fluids under varying pressurized conditions. Current volumetric capacities of liquid cylinders range from approximately 30 gal (100 liters) to 45 gal (160 liters). There are basically three types of liquid cylinders in use today; liquid withdrawal type, in which the cryogen is stored at pressures up to 25 psig for liquid dispensing; gas withdrawal type, in which the cryogen can be stored at pressures up to 200 psig or more; and liquid/gas type cylinders, which can be utilized for either liquid or gas withdrawal. Liquid cylinders were developed and put on the market about ten years ago, primarily because of economic savings over high pressure gas cylinders in transportation, storage, handling and number of cylinder changeovers.
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