DESIGN OF LOW HEAT LEAK LIQUID HELIUM DEWAR

CRYOGENICS

IPR is planning to develop an indigenous Liquid Helium Refrigeration/Liquefaction Plant. So, at the end of the Liquefaction process when the Liquid Helium is produced, it is required to store. And from that it is supplied to different application and the generated He vapor is resupplied to the plant for the further liquefaction. So, to store this produced liquid helium, Liquid Helium Dewar will be used. The proposed Liquid helium (LHe) Dewar is to store liquid helium of 1000 liters. With design internal pressure 1.5 bar. This LHe storage Dewar should be designed such that the heat leak will as minimum as possible. To reduce heat leaks, it is planned to use vacuum and multilayer insulations (MLI). The vacuum space between inner and outer shell should have vacuum of 10 -5 mbar or lower. The support structures of the inner shell which will carry the LHe need to be done considering the mechanical stress and low heat leaks. Appropriate ports should be included for vacuum pumping, safety valve and burst disc connection for pressure release, LHe and vapor process line connections, instrumentation connections. Requirements of these equipment also have to be worked out to find overall specs for procurement. The Dewar can be of vertical configuration having cylindrical shell with top and bottom dish ends.

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