FIELD: construction, laying of pipe-lines. SUBSTANCE: insulating system has tubular body 1 made of lamellar composite material, internal sealing ring interlayer 17 made of elastic or thermosoftening plastic material laid on bottom 18 in each annular groove 3, 4 and 5, 6 which is in constant contact with ring packers 7, 8 and 9, 10 positioned in them. Circular groove 11 houses dry layers of glass or basalt cloth laid as fire and heat- proof material. Interlayer 17 is located between congruent layers 15, 16 of composite material. EFFECT: enhanced reliability of weld in steel pipe-lines. 6 cl, 4 dwg
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