Cryogenic rotating seal

A swivel bayonet joint for transferring cryogenic fluids, comprising:

• a plug bayonet joint comprising:
• an insertion stem having an insertion jacket surrounding and co-axial with a plug inner line of a corresponding pipe section;
• and
• a first clamp member having at least one race;
• and
• a socket bayonet joint comprising:
• a vacuum jacket at a distal end thereof that sleeves over the insertion stem of the plug bayonet joint;
• and
• a second clamp member having at least one race;
• wherein:
• when the plug bayonet joint is mated with the socket bayonet joint, the race of the first clamp member aligns with the race of the second clamp member to define a clamp having a bearing aperture;
• when ball bearings fill the bearing aperture, the ball bearings function to lock the plug bayonet joint to the socket bayonet joint so as to allow rotation therebetween;
• and
• the socket bayonet joint includes a rectangular or square outer surface with through holes for attaching to a fixed structure in alignment with a centerline of a hinge pin with spacers between the structure and swivel bayonet joint to align on the centerline axis of the hinge pin.