FIELD: tube insulation systems. SUBSTANCE: weld-in coupling uses annular gaskets of polyethylene tubes as supporting and centering surfaces for it on joined envelopes of polyethylene tubes. Said annular gaskets are mounted at assembling process in shop. Recess for placing additive material for extrusion welding is formed by end of coupling, end of envelope and surface of annular gasket. EFFECT: enhanced reliability and strength of joint due to joining on annular gaskets providing elimination of non-welded zones. 2 cl, 2 dwg
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