FIELD: cryogenic pipe lines. SUBSTANCE: joint includes tips of two pipes and insulating envelopes. Pipes are inserted one in other at overlapping forming inner clearance between tips consisting of radial and circular parts. Length of circular part exceeds considerably length of clearance of radial part. Clearance is provided with seals. Joint is provided with ball locking mechanism secured on outer and inner tips of pipes consisting of inner and outer circular holders with balls-retainers fitted between them in grooves for coaxial turn and fixation of pipes. EFFECT: enhanced reliability and tightness; ease in operation. 6 cl, 5 dwg
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