The salt circulating system consists  of  the circulating pump (test section),a throttling valve, two salt to air heat exchangers, and the connecting piping. It provides a closed piping loop for the molten salt from the pump discharge to the pump suction. A  salt storage tank is provided to contain the quantity of salt necessary to fill the circulating system.It  is  connected t o the circulating system by  a  pipe containing a  freeze vslve.AlL  s&lt  containing components  will  be  constructed of nickel -molybdenum-chromium (Ni-Mo-Cr) alloy.Electric heaters capable of heating the  salt  system  to 13OO F  will  be provided.Thermal insulation  will  be  installed on the system  as  appropriate.