ROTARY JOINT DEVICE FOR CRYOGENIC LIQUID

摘要

A device forming a swivel joint for a cryogenic liquid with at least one central duct for the flow of said cryogenic liquid through the joint and comprising at least one annular duct co-axially surrounding said central duct for the return of the cold gas originating from the vaporization of the moving liquid, said annular duct comprising gas inlet and outlet pipes; a stationary portion and a portion mounted in rotating relation to said stationary portion by means of a ball or roller bearing operating at a temperature close to ambient temperature, a double set of sealing gaskets also operating at a temperature close to ambient temperature; and heat insulation of at least the parts of said stationary and movable portions forming said annular duct and contacted by said cold gas, so arranged as to prevent any cooling-down of said sealing gaskets through convection or radiation; the device being applicable in particular to the off-shore transfer of liquefied natural gas.