Helium liquefaction system

The Helium liquefaction system will be used for liquification of He gas produced by several NMR spectrometers, STM’s, and other sources of He gas. The Helium liquefaction system should contain a helium liquefier (liquefier), associated compres-sors, gas purifier (purifier), and intermediate low-pressure storage (called low gas permeability bag or bags), and associated transfer lines. The setup should be connected to the helium gas outlet col-lecting He gas from several NMR spectrometers and other helium gas sources.