Patent ID: 6349947
Filing Date: 2002-02-26
Classification: D06F,Y10S

Abstract:
A sealing arrangement which engages an opening of a pressure chamber containing pressurized cryogenic fluid, said sealing arrangement comprising:a) a primary seal circumferentially surrounding the opening of the pressure chamber; b) a secondary seal circumferentially surrounding the primary seal; c) a door movably positioned to seal and unseal said pressure chamber opening, said door preventing a flow of fluid through the opening and engaging said primary and secondary seals to define an annular space therebetween when the chamber opening is sealed; d) a pressure sensor in communication with the annular space so that a pressure increase within the annular space may be detected; e) a relief valve in communication with the annular space and a space exterior to both the annular space and the pressure chamber, said relief valve set to open when a pressure within the annular space exceeds a predetermined level that is set at a pressure that prevents formation of dry ice in the annular space; whereby leakage of the primary seal may be detected and the annular space may be vented when the pressure therein exceeds the predetermined level.