Vacuum-jacketed piping is a similar concept to that found in bulk tanks or dewars. There are multiple types of insulated piping, but they generally are categorized as vacuum jacketed and non-vacuum jacketed. Dewar tanks are portable and can be situated closer to the use point, requiring a shorter length of hose.įor either type of storage vessel, insulated piping should be used to limit losses and improve efficiency. Large bulk tanks typically are installed outside and require longer piping systems to transfer the liquid to the use point. The nitrogen can be held in liquid form for quite a while, but even with this vacuum barrier, the insulation isn’t perfect and tank losses can range between 0.5 percent and 2 percent a day. This vacuum jacket allows the tank’s outside surface to remain at ambient temperature, while maintaining cryogenic temperature inside. Both designs feature a double-wall construction with the inner and outer walls separated by a vacuum space.
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